ASSP Power Supply Applications 6-ch DC/DC Converter With Synchron

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ASSP Power Supply Applications 6-ch DC/DC Converter With Synchron

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DS04-27220-5Ea
ASSP Power Supply Applications
6-ch DC/DC Converter With Synchronous Rectifier
MB3825A
DESCRIPTION
MB3825A pulse width modulation (PWM) type 6-channel DC/DC converter with synchronous rectification (2-channels) designed voltage, high efficiency operation high precision high frequency applications, ideal down conversion. MB3825A ideal device offering power consumption, compact size light weight products such self-contained camcorders digital still cameras. This product covered Patent Number 6,147,477.
FEATURES
Synchronous rectification (channels High efficiency drive with power-on output enhanced built-in speed-up circuit Wide range operating power supply voltage Built-in high-precision reference voltage generator Wide operating oscillator frequency range, high frequency capability Wide input voltage range (all channels) Error amplifier output soft-start (channels (All channels same soft-start time regardless duty factor setting.)
PACKAGE
64-pin plastic LQFP 64-pin plastic LQFP
(FPT-64P-M03)
(FPT-64P-M20)
Copyright©2003-2008 FUJITSU MICROELECTRONICS LIMITED rights reserved 2003.8
MB3825A
ASSIGNMENT
OUT2-4
OUT1-4
OUT1-3
OUT1-5
OUT1-2
CB1-4
CB2-4
CB2-3
CB1-3
CB2-2
CB2-5 CB1-5 OUT1-6 CB2-6 CB1-6 OVP5,
CB1-2 OUT1-1 CB2-1 CB1-1 OUT2-1
CSCP
GND1
GND2
VREF
CTL2
CTL1
DTC3
MB3825A
DESCRIPTION
Symbol OUT1-1 OUT2-1 CB1-1 CB2-1 OUT1-2 CB1-2 CB2-2 OUT1-3 CB1-3 CB2-3 DTC3 OUT1-4 OUT2-4 CB1-4 CB2-4 Descriptions Channel error amplifier output terminal. Channel error amplifier inverted input terminal. Channel short detection comparator input terminal. Channel main side output terminal. Channel synchronous rectifier side output terminal. Channel boot capacitor connection terminal. Channel output sink current setting terminal. Channel error amplifier output terminal. Channel error amplifier inverted input terminal. Channel short detection comparator input terminal. Channel output terminal. Channel boot capacitor connection terminal. Channel output sink current setting terminal. Channel error amplifier output terminal. Channel error amplifier inverted input terminal. Channel short detection comparator input terminal. Channel output terminal. Channel boot capacitor connection terminal. Channel output sink current setting terminal. Channel dead time control terminal. Channel error amplifier output terminal. Channel error amplifier inverted input terminal. Channel short detection comparator input terminal. Channel main side output terminal. Channel synchronous rectifier side output terminal. Channel boot capacitor connection terminal. Channel output sink current setting terminal. (Continued)
MB3825A
TriangularWave Oscillator Circuit
Symbol OUT1-5 CB1-5 CB2-5 OVP5, OUT1-6 CB1-6 CB2-6 OVP5,
Descriptions Channel error amplifier output terminal. Channel error amplifier inverted input terminal. Channel error amplifier non-inverted input terminal. Channel short detection comparator input terminal. Channel output terminal. Channel boot capacitor connection terminal. Channel output sink current setting terminal. Channel output maximum voltage setting terminal. Channel error amplifier output terminal. Channel error amplifier inverted input terminal. Channel error amplifier non-inverted input terminal. Channel short detection comparator input terminal. Channel output terminal. Channel boot capacitor connection terminal. Channel output sink current setting terminal. Channel output maximum voltage setting terminal. Triangular wave frequency setting resistor connection terminal. Triangular wave frequency setting capacitor connection terminal. Power supply control circuit. level Power supply operating mode level Standby mode Channel control circuit. When CTL1 terminal level level Channel operating mode level Channel mode Short detection comparator input terminal. Short protection circuit capacitor connection terminal. Soft-start circuit capacitor connection terminal. (Continued)
CTL1
Control Circuit
CTL2
CSCP
MB3825A
(Continued) Power Supply Circuit
Symbol VREF GND1 GND2
Descriptions Reference voltage control circuit power supply terminal. Output circuit power supply terminal (Channel Output circuit power supply terminal (Channel Output circuit power supply terminal (Channel Reference voltage output terminal. Ground terminal. Ground terminal. Output circuit ground terminal (Channel Output circuit ground terminal (Channel
MB3825A
BLOCK DIAGRAM
General view
<CH1>
-IN(E)1 IN(C)1 Comp.1 Comp.1-2 Drive OUT2-1 Error Amp.1 Comp.1-1 Drive VCC(O)1, CB1-1 CB2-1 OUT1-1
<CH2>
-IN(E)2 Comp.2 Error Amp.2 Comp.2 Drive VCC(O)2 CB1-2 CB2-2 OUT1-2
IN(C)2
<CH3>
-IN(E)3 CTL2 IN(C)3 Comp.3 GND(O)1, Error Amp.3 Comp.3 Drive CB1-3 OUT1-3 CB2-3
DTC3
<CH4>
-IN(E)4 Comp.4 Comp.4-2 Drive Error Amp.4 Comp.4-1 Drive
VCC(O)4, CB1-4 OUT1-4 OUT2-4 CB2-4
IN(C)4
-IN(E)5 Error Amp.5 Comp.5
<CH5>
Drive OUT1-5 CB1-5
CB2-5
IN(C)5 +IN(E)5
Comp.5
-IN(E)6 Error Amp.6 Comp.6
<CH6>
Drive OUT1-6 CB1-6
CB2-6
IN(C)6 +IN(E)6
Comp.6
GND(O)4, Comp.
OVP5,
Comp.
Buff Soft Start Comp.
0.65
CSCP
-1.35 -0.65 -1.35 -0.65
CTL1
UVLO
Power ON/OFF GND1 GND2
VREF
MB3825A
Enlarged view
<CH1>
-IN(E)1 IN(C)1 Comp.1 Comp.1-2 Drive Error Amp.1 Comp.1-1 Drive
VCC(O)1, CB1-1 CB2-1 OUT1-1 OUT2-1
<CH2>
-IN(E)2 Error Amp.2 Comp.2 Drive
VCC(O)2 CB1-2 CB2-2 OUT1-2
IN(C)2
Comp.2
MB3825A
Enlarged view
<CH3>
-IN(E)3 CTL2 IN(C)3 Comp.3 GND(O)1, Error Amp.3 Comp.3 Drive CB1-3 OUT1-3 CB2-3
DTC3
<CH4>
-IN(E)4 Comp.4 Comp.4-2 Drive Error Amp.4 Comp.4-1 Drive
VCC(O)4, CB1-4 OUT1-4 OUT2-4 CB2-4
IN(C)4
MB3825A
Enlarged view
-IN(E)5 Error Amp.5 Comp.5
<CH5>
Drive OUT1-5 CB1-5
CB2-5
IN(C)5 +IN(E)5
Comp.5
-IN(E)6 Error Amp.6 Comp.6
<CH6>
Drive OUT1-6 CB1-6
CB2-6
IN(C)6 +IN(E)6
Comp.6
GND(O)4, Comp.
OVP5,
Comp.
Buff Soft Start Comp. CSCP
0.65
-1.35 -0.65 -1.35 -0.65
CTL1
UVLO
Power ON/OFF GND1 GND2
VREF
MB3825A
ABSOLUTE MAXIMUM RAGINGS
Rating 800* +125
Parameter Power supply voltage Output current Output peak current Power dissipation Storage temperature
Symbol Tstg
Conditions terminal terminal, Duty
Unit
packages mounted epoxy board WARNING: Semiconductor devices permanently damaged application stress (voltage, current, temperature, etc.) excess absolute maximum ratings. exceed these ratings.
RECOMMENDED OPERATING CONDITIONS
Value 1500
Parameter Power supply voltage Reference voltage output current Input voltage Control input voltage Output current Output current setting resistor Oscillator frequency Timing capacitor Timing resistor Soft-start capacitor Short detection capacitor Operating ambient temperature
Symbol VCTL fOSC CSCP
Conditions terminal terminal Main side terminal
Unit
WARNING: recommended operating conditions required order ensure normal operation semiconductor device. device's electrical characteristics warranted when device operated within these ranges. Always semiconductor devices within their recommended operating condition ranges. Operation outside these ranges adversely affect reliability could result device failure. warranty made with respect uses, operating conditions, combinations represented data sheet. Users considering application outside listed conditions advised contact their representatives beforehand.
MB3825A
ELECTRICAL CHARACTERISTICS
(VCC +25°C) Parameter Reference voltage Reference voltage block Output voltage temperature stability Input stability Load stability Short-circuit output current Under voltage lockout protection circuit block (U.V.L.O) Soft-start block Short circuit detection block Threshold voltage Hysteresis width Reset voltage Input standby voltage Charge current Threshold voltage Input standby voltage Input latch voltage Input source current Oscillator frequency Triangular wave oscillator block Symbol VREF VREF /VREF Line Load VRST VSTB VSTB ICSCP fOSC Conditions VREF VREF Value 1.485 -1.4 0.65 -1.4 1.500 0.5* -1.0 0.70 -1.0 1.515 -0.6 0.75 -0.6 Unit
Frequency stability voltage Frequency stability temperature
f/fdv
f/fdt
Standard design value. (Continued)
MB3825A
(VCC +25°C) Parameter Threshold voltage temperature stability Input bias current Voltage gain Frequency bandwidth
Symbol
Conditions (CH1, CH4) (CH2, CH3)
Value 1.45 -200 1.45 1.50 0.5* 1.0* 1.55 -2.0 1.0* 1.55 -2.0 1.50 1.55 -0.6 -0.6 1.55
Unit
VT/VT
VOM+ VOM-
Error amplifier block (CH1 CH4)
Maximum output voltage width
Output source current Output sink current Input offset voltage Input bias current Error amplifier bolck (CH5, CH6) Common mode input voltage range Voltage gain Frequency bandwidth Maximum output voltage width Output source current Output sink current Threshold voltage Comp. block (CH1 Input bias current CH4, SCP) Standard design value.
terminal -400 terminal -200 terminal -400 1.45 1.45 -200
VOM+ VOM-
(Continued)
MB3825A
(Continued) (VCC +25°C) Parameter Comp. block (CH5, CH6) Comp. block (CH1 CH6) Dead time control block (CH3) (DTC terminal) Input offset voltage Input bias current Common mode input voltage range Symbol
Conditions Duty cycle
Value 0.55 -400 0.60 0.65
Unit
Threshold voltage VT100 Input bias current Sink current CTL2 Input voltage CTL2 IIDTC VIDTC
0.55
0.65
Duty cycle 100% CTL2 IDTC CTL2 Duty cycle
-1.0
1.35 -0.2 -100
1.45
Main side Output source current output block (CH1 CH6) Output sink current (Drive-1) SynchroOutput source current nous rectifier side output Output sink current block (CH1, Output voltage CH4) (Drive-2) Control block input condition Input current Comp. Threshold voltage block
VOFF ICTL ICCS
Duty cycle Duty cycle active mode standby mode terminal, terminal,
0.70
0.65
0.60
Standby current General Power supply current Standard design value. ICCS
MB3825A
TYPICAL CHARACTERISTICS
Power supply current power supply voltage
10.0
Reference voltage power supply voltage
Power supply current (mA)
Reference voltage VREF
VCTL1,
Power supply voltage Reference voltage power supply voltage
Power supply voltage Reference voltage ambient temperature
1.55 1.54 VCTL1, 1.53 1.52 1.51 1.50 1.49 1.48 1.47 1.46 1.45
Reference voltage VREF
Reference voltage VREF
Power supply voltage Reference voltage control voltage
Ambient temperature (°C) Control current control voltage
Reference voltage VREF
Control current ICTL1 (µA)
Control voltage VCTL1
Control voltage VCTL1 (Continued)
MB3825A
Control current control voltage
VCTL1
Triangular wave upper lower limit voltage timing capacitor Triangular wave upper lower limit voltage
Control current ICTL2 (µA)
Upper
Lower
Control voltage VCTL2 CT1, oscillator frequency fOSC (Hz) Triangular wave time timing capacitor
Timing capacitor (pF) Oscillator frequency timing resistor
1500
Triangular wave time (µs)
Timing capacitor (pF) Triangular wave frequency stability ambient temperature Triangular wave frequency stability
Timing resistor Triangular wave upper lower limit voltage ambient temperature
Triangular wave upper lower limit voltage
upper
lower
Ambient temperature
Ambient temperature (Continued)
MB3825A
Duty oscillator frequency (ch1)
Duty oscillator frequency (ch4)
Duty
Duty
Oscillator frequency fOSC (Hz)
Oscillator frequency fOSC (Hz)
Output sink current output sink current setting resistor
Output sink current (mA)
Output sink current setting resistor
(Continued)
MB3825A
(Continued) Error amplifier gain phase frequency (ch1)
Gain (dB)
Phase (deg)
VREF
-180
Frequency (Hz) Error amplifier gain phase frequency (ch5)
Gain (dB)
Phase (deg)
-180
Frequency (Hz) Power dissipation ambient temperature
1000
Power dissipation (mW)
Ambient temperature
MB3825A
FUNCTIONAL DESCRIPTION
Switching Regulator Function
Reference voltage circuit reference voltage circuit generates temperature-compensated reference voltage 1.500 using voltage supplied from power supply terminal (pin This voltage used reference voltage internal circuits reference voltage also supplied external device from VREF terminal (pin Triangular-wave oscillator circuit connecting timing capacitor resistor (pin (pin terminals, possible generate desired triangular oscillator waveform amplitude amplitude 0.65 1.35 phase with CT1, amplitude 0.65 1.35 inverse phase with triangular wave input CT1, comparator within Error amplifier This amplifier detects output voltage switching regulator outputs control signal accordingly. wide common-mode input voltage range from channels allows easy setting from external power supply, making system suitable motor speed control. connecting feedback resistor capacitor from error amplifier output terminal inverted input terminal, form desired loop gain, stable phase compensation. comparator comparators these channels voltage comparator with inverted input non-inverted input (channels well inverted input non-inverted inputs (channel voltage pulse width modifier control output duty according input voltage. interval when error amplifier output voltage higher than triangular waveform, output transistor turned (channels interval when error amplifier output voltage lower than triangular waveform, output transistor turned (channel synchronous rectifier side) interval when error amplifier output voltage DTC3 voltage higher than triangular waveform, output transistor switched (channel Output circuit output circuits comprised totem-pole configuration both main side synchronous rectifier side, drive external transistor (main side) N-ch MOSFET (synchronous rectifier side) Sink current main side) depending resistance terminal.
Channel Control Function
Channel levels dependent voltage levels CTL1 terminal (pin terminal (pin Table Channel Channel On/Off Setting Conditions. terminal voltage level CTL1 CTL2 On/Off state channel Power supply Channel Channel Channel Channel Channel circuit (standby mode) Channel
power supply current standby mode less.
MB3825A
Protective Functions
Timer-latch short-circuit protection circuit short detection comparator each channel detects output voltage level, when channel output voltage falls below short detection voltage, terminal (pin voltage falls below reference voltage, timer circuit starts operating capacitor CSCP connected CSCP terminal (pin starts charging. When capacitor charge reaches approximately output transistor turned idle interval becomes 100%. When actuated, this protection circuit reset turning power supply again. (See "METHOD SETTING TIME CONSTANT TIMER-LATCH SHORT PROTECTION CIRCUIT".) Under voltage lockout protection circuit transient state power-on momentary drop power supply voltage causes control malfunction, resulting system breakdown system deterioration. detecting internal reference voltage with respect power supply voltage, this protection circuit resets latch circuit turn output transistor duty (OFF) 100%, while same time holding CSCP terminal (pin "L". reset cleared when power supply voltage becomes greater than equal threshold voltage level this protection circuit. Output Supply Monitor Comparator (Vcc Comp.) output supply monitor comparator compares output circuit power supply (VCC level, operates timer-latch short protection circuit output circuit power supplies fall below 0.65
MB3825A
METHODS SETTING OUTPUT VOLTAGE
Figure
Error Amp1
Comp1
Figure
(E)5 Error Amp5 V+IN
VOVP5, V+IN VOVP5,
VOVP5, V+IN
Motor control signal
Comp5
OVP5,
MB3825A
METHOD SETTING OUTPUT CURRENT
Figure shows configuration output circuits, Figure illustrates sink current value output current waveform constant current setting. Note that sink current following formula Sink current (VB/RB) 56/RB Figure Output circuit (main side)
VCC(O)
External transistor
Output base current speed-up
Source current
OUT1
comparator
Output driver
Sink current
Figure Output current waveform Speed-up current Sink current
Output current
Source current (peak)
MB3825A
Note Output current setting resistance should connected each channel shown Figure below. channel connect respective terminals through setting resistor channel connect terminal through setting resistor RB2. channels connect respective terminals through setting resistor Figure Output sink current setting connections
VCC(O) VCC(O) MB3825A VCC(O)
OSCILLATOR FREQUENCY SETTING
oscillator frequency connecting timing capacitor (CT) terminal (pin timing resistor (RT) terminal (pin Oscillator frequency fOSC fOSC (kHz) 1950000 (pF)
MB3825A
METHOD SETTING TIME CONSTANT TIMER-LATCH SHORT PROTECTION CIRCUIT
short detection comparator (SCP comparator) each channels constantly compares error amplifier output level reference voltage terminal (pin While switching regulator load conditions stable channels, when voltage level terminal higher than reference voltage, short detection comparator output remains level, transistor turned CSCP terminal (pin held input standby voltage (VSTB load conditions change rapidly short-circuiting load, causing output voltage drop, voltage terminal falls below reference voltage level, output from short detection comparator corresponding channel input terminal goes level. This causes transistor turn external short protection capacitor CSCP connected CSCP terminal charge Short Detection Time (tPE) CSCP (µF) When capacitor CSCP charged threshold voltage latch set, external turned (inactive interval 100%) this point latch input closed CSCP terminal held input latch voltage Figure Protection timer-latch short protection circuit External transistor
Buff
Comp.1
Output stage Output stage
OUT1-1
OUT2-1
Comp.
Output stage
OUT1-3
Soft Start Comp.
Output stage
OUT1-6 CTL2
CSCP
bias UVLO bias
CSCP
Timer-latch short circuit protection circuit
Power ON/OFF
CTL1 VREF
MB3825A
TREATMENT WITHOUT USING CSCP
When timer-latch short protection circuit, connect CSCP terminal (pin with shortest distance. Figure Treatment when using CSCP
CSCP GND1 GND2
MB3825A
METHOD SETTING SOFT-START TIME
Channels provide soft-start preventing current surges power-on, soft-start capacitor (Cs) connected terminal (pin When started (when CTL1 terminal (pin goes level, UVLO threshold voltage) transistors switches terminal begins charging external soft-start capacitors (Cs) error amplifier makes soft-start proportion output voltage teminal voltage regardless load current DC/DC converter. Note that soft-start time calculated following formula. Soft-start time (output rise time) (µF)
Figure Soft-start circuit
(E)1 Error Amp1
External transistor
Output stage Output stage
OUT1-1
OUT2-1
Output stage
Buff
OUT1-3
Soft Start Comp.
Output stage
bias
OUT1-6 CTL2
CSCP
CSCP
UVLO
Power ON/OFF
CTL1 VREF
MB3825A
Channel capacitor CDTC3 placed between DTC3 terminal (pin GND, that when CTL2 terminal (pin goes from level, transistor turned output voltage proportion DTC3 terminal voltage providing soft-start operation. short detection function turned during soft-start operation, this setting should made under following condition. Channel soft-start circuit time Short detection time Figure Channel soft-start circuit
Error Amp.3
External transistor
Comp.3
Output stage
OUT1-3
(CH3) CTL2 DTC3 CDTC3 Comp.3
VREF
UVLO
MB3825A
PROCESSING WITHOUT USING TERMINAL
soft-start function used, terminal (pin channels should left open. channel connect DTC3 terminal (pin VREF terminal (pin Figure When soft-start time channel)
Open
Figure When soft-start time channel)
VREF
DTC3
MB3825A
METHOD SETTING DEAD TIME
When device step-up inverted output based flyback method, output transistor fixed full-on state (ON-duty 100%) power switch-on.To prevent this problem, determine voltages DTC3 terminal (pin from VREF voltage easily output transistor's dead time (maximum ON-duty) independently each channel shown Figure.12. When voltage DTC3 terminal lower than triangular-wave (CT1) output voltage from oscillator, output transistor turns off. dead time calculation formula assuming that triangular-wave amplitude triangular-wave maximum voltage 1.35 given below. Duty (ON) 0.65
When this DTC3 terminal, connect then VREF terminal (pin shown Figure.13. Figure When using dead time
VREF DTC3
Figure When using dead time
VREF
DTC3
MB3825A
APPLICATION EXAMPLE
General view
VFB1 13.5 0.033 VOUT1-1 VO1(3.2
<CH1>
IN(C)1 Comp.1 Comp.1-2 Drive Error Amp.1 Drive Comp.1-1
-IN(E)1
VCC(O)1, CB1-1 CB2-1 OUT1-1 OUT2-1
FMMT717
2SK2316
U1FWJ44N
VOUT2-1
23.5 0.033
<CH2>
Error Amp.2 Comp.2 Drive
-IN(E)2
VCC(O)2 CB2-2 CB1-2 OUT1-2
U1FWJ44N
VO2(5.05
FMMT717
IN(C)2
Amp.2
42.5 0.033
<CH3>
CTL2 ON(CH3) IN(C)3 Comp.3 GND(O)1, Error Amp.3 Comp.3 Drive CB1-3 OUT1-3 CB2-3 2SB1121 1SS196
VO3(15
-IN(E)3
DTC3
VO4(4.89 FMMT717
13.5 0.033
VCC(O)4,
<CH4>
Comp.4 Error Amp.4 Comp.4-1 Comp.4-2 Drive Drive
CB1-4 OUT1-4 OUT2-4 CB2-4 2SK2316
-IN(E)4
U1FWJ44N
IN(C)4
Error Amp.5 Drive Comp.5
<CH5>
OUT1-5 CB1-5 CB2-5 FMMT717
VO5(4.5
0.033
-IN(E)5
U1FWJ44N
IN(C)5 +IN(E)5
Comp.5
<CH6>
Error Amp.6 Drive Comp.6 OUT1-6 CB1-6 CB2-6 FMMT717
VO6(4.5
0.033
-IN(E)6
U1FWJ44N
IN(C)6 +IN(E)6
Comp.6
GND(O)4, Comp.
OVP5,
Over voltage threshold setting voltage
Comp.
Buff Soft Start Comp.
0.65
FMMT717 ZETEX plc. 2SB1121 SANYO Electric Co., Ltd. 2SK2316 SANYO Electric Co., Ltd. 1SS196 TOSHIBA CORPORATION U1FWJ44N TOSHIBA CORPORATION
CSCP
-1.35 -0.65 -1.35 -0.65
CTL1
UVLO
Power ON/OFF
VREF GND1 GND2
(CH1, (standby state)
MB3825A
VFB1 VO1(3.2
VOUT1-1
Enlarged view
13.5 FMMT717 Error Amp.1 OUT1-1 OUT2-1 VOUT2-1 Comp.1-2 Drive 2SK2316 Comp.1 Drive U1FWJ44N Comp.1-1
<CH1>
0.033
-IN(E)1
VCC(O)1, CB1-1 CB2-1
IN(C)1
FMMT717 U1FWJ44N
23.5 Error Amp.2 Amp.2 Drive OUT1-2 Comp.2
<CH2>
VO2(5.05
0.033
-IN(E)2
VCC(O)2 CB2-2 CB1-2
IN(C)2
(CH1, (standby state)
FMMT717 ZETEX plc. 2SB1121 SANYO Electric Co., Ltd. 2SK2316 SANYO Electric Co., Ltd. 1SS196 TOSHIBA CORPORATION U1FWJ44N TOSHIBA CORPORATION
42.5 CB1-3 CB2-3 OUT1-3 VCC(O)4, Comp.3 GND(O)1, Drive 2SB1121 1SS196 Error Amp.3 Comp.3
<CH3>
VO3(15
Enlarged view
-IN(E)3
0.033
CTL2 ON(CH3) IN(C)3
DTC3
FMMT717 CB2-4 OUT1-4 Drive OUT2-4 2SK2316 Drive U1FWJ44N VO4(4.89
13.5 CB1-4 Error Amp.4 Comp.4-1 Comp.4 Comp.4-2
<CH4>
-IN(E)4
0.033
IN(C)4
MB3825A
(CH1, (standby state)
FMMT717 ZETEX plc. 2SB1121 SANYO Electric Co., Ltd. 2SK2316 SANYO Electric Co., Ltd. 1SS196 TOSHIBA CORPORATION U1FWJ44N TOSHIBA CORPORATION
<CH5>
CB2-5 U1FWJ44N OUT1-5 Drive CB1-5 FMMT717 Error Amp.5 Comp.5
VO5(4.5
-IN(E)5
0.033
MB3825A
Enlarged view
IN(C)5 +IN(E)5
Comp.5
<CH6>
Error Amp.6 CB2-6 OUT1-6 Drive Comp.6 CB1-6 FMMT717
VO6(4.5
-IN(E)6
0.033
U1FWJ44N
IN(C)6 +IN(E)6 OVP5, Buff Comp. Comp.
Comp.6
GND(O)4,
Over voltage threshold setting voltage
0.65
Soft Start Comp. CSCP
CTL1
-1.35 -0.65 -1.35 -0.65
(CH1, (standby state)
UVLO
Power ON/OFF VREF GND1 GND2
FMMT717 ZETEX plc. 2SB1121 SANYO Electric Co., Ltd. 2SK2316 SANYO Electric Co., Ltd. 1SS196 TOSHIBA CORPORATION U1FWJ44N TOSHIBA CORPORATION
MB3825A
REFERENCE DATA
Channel switching operation waveform (operation kHz)
(µs)
expansion
(µs)
Synchronous rectifier length
MB3825A
Channel main side output waveform (operation kHz)
VFB1 (µs) VFB1
Channel main side base current waveform (operation kHz)
IOUT1-1 (mA) IOUT1-1 VFB1 (µs) VFB1 -100
Peak current when turned Peak current when turned (Continued)
MB3825A
(Continued) Channel synchronous rectifier side output waveform (operation kHz)
VOUT2-1 (µs)
Channel synchronous rectifier side output waveform (operation kHz)
IOUT2-1 (mA) VOUT2-1 (µs)
Output source current peak value Output sink current peak value
MB3825A
NOTES
Take account common impedance when designing earth line printed wiring board. Take measures against static electricity. semiconductors, antistatic conductive containers. When storing carrying printed circuit board after chip mounting, conductive container. work table, tools measuring instruments must grounded. worker must grounding device containing resistors series. apply negative voltage Applying negative voltage -0.3 less generate parasitic transistor, resulting malfunction.
ORDERING INFORMATION
Part number MB3825APFV MB3825APFF Package 64-pin plastic LQFP (FPT-64P-M03) 64-pin plastic LQFP (FPT-64P-M20) Remarks
MB3825A
PACKAGE DIMENSION
64-pin Plastic LQFP (FPT-64P-M03)
12.00±0.20(.472±.008)SQ
10.00±0.10(.394±.004)SQ
Note These dimensions include resin protrusion. Note 2)Pins width pins thickness include plating thickness. Note 3)Pins width include cutting remainder.
0.145±0.055 (.006±.002)
Details part 0.08(.003) 1.50 -0.10 .059 -.004
+0.20 +.008
(Mounting height)
INDEX
0°~8° 0.50±0.20 (.020±.008) 0.60±0.15 (.024±.006)
0.10±0.10 (.004±.004) (Stand off)
0.25(.010)
LEAD
0.50(.020)
0.20±0.05 (.008±.002)
0.08(.003)
2003 FUJITSU LIMITED F64009S-c-5-8
Dimensions (inches) Note values parentheses reference values.
MB3825A
64-pin Plastic LQFP (FPT-64P-M20)
9.00±0.20(.354±.008)SQ 7.00±0.20(.276±.008)SQ
1.60(.063)MAX 1.40±0.10 (.055±.004) 0.10±0.10 (.004±.004)
Details part
0.10(.004) INDEX
(1.00(.039))
3.5°±3.5° 0.127(.005)
0.50±0.20 (.020±.008)
0.40(.016)
0.16±0.03 (.006±.001)
2000 FUJITSU LIMITED F64031S-1c-1
Dimensions (inches) Note values parentheses reference values.
MB3825A
MEMO
FUJITSU MICROELECTRONICS LIMITED
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ASSP Power Supply Applications 6-ch DC/DC Converter With Synchron

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