Start-Up Operating Current High Current Totem Pole Output Undervoltage

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Start-Up Operating Current High Current Totem Pole Output Undervoltage

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fixed frequency current mode controller. They specially designed OFF-Line converter applications with minimal external components. Internally implemented circuits include trimmed oscillator precise duty cycle control, temperature compensated reference, high gain error amplifier, current sensing comparator, high current totempole output ideally suited driving power MOSFET. Protection circuitry includes built undervoltage lockout current limiting. 3842A(AM) 3844A(AM) have UVLO thresholds (on) (off). corresponding thresholds 3843A(AM)/45A(AM) 8.4V (on) 7.6V (off). MIK3842A(AM) MIK3843A(AM) operate within 100% duty cycle. 3844A(AM) UC3845A(AM) operate within duty cycle. 384XA(AM) Start-Up Current 0.17mA (typ).
Start-Up Operating Current High Current Totem Pole Output Undervoltage Lockout With Hysteresis Operating Frequency 300KHz (384XA) 500KHz (384XAM)
Connection
view
Block diagram
(toggle flip flop used only MIK3844, MIK3845)
VREF SET/ RESET UVLO GOOD LOGIC INTERNAL BIAS POWER VREF
C.S. COMP
LATCH
COMP CURRENT SENSE
OSCILLATOR
POWER
Absolute Maximum Ratings
Symbol ISINK (E.A) Tstg Parameter Supply Voltage (low impedance source) Output Current Input Voltage (Analog Inputs pins 2,3) Error Output Sink Current Power Dissipation (TA=250C) Storage Temperature Range Lead Temperature (soldering sec.) Maximum -0.3 to150 Units
BEIJING ESTEK ELECTRONICS CO.,LTD
Electrical characteristics
(*VCC=15V, RT=10k, CT=3.3nF, TA=00C +700C, unless otherwise specified)
Characteristics Reference Section Reference Output Voltage Line Regulation Load Regulation Short Circuit Output Current Oscillator Section Oscillation Frequency Frequency Change with Voltage Oscillator Amplitude Error Amplifier Section Input Bias Current Input Voltage Open Loop Voltage Gain Power Supply Rejection Ratio Output Sink Current Output Source Current High Output Voltage Output Voltage Current Sense Section Gain Maximum Input Signal Supply Voltage Rejection Input Bias Current Output Section Output Voltage High Output Voltage Rise Time Fall Time Undervoltage Lockout Section Start Theshold Min. Operating Voltage (After Turn Section Max. Duty Cycle Min. Duty Cycle Total Standby Current Start-Up Current D(MAX) D(MAX) MIK384XA(AM) 0.17 MIK3842A(AM)/43A(AM) MIK3844A(AM)/45A(AM) VTH(ST) VOPR(min) MIK3842A(AM)/44A(AM) MIK3843A(AM)/45A(AM) MIK3842A(AM)/44A(AM) MIK3843A(AM)/45A(AM) 14.5 16.0 17.5 11.5 f/VCC V(OSC) IBIAS VI(E.A) AVOL PSRR ISINK ISOURCE VI(MAX) IBIAS MIK384XA MIK384XAM (peak peak) VFB=3V Vpin1 2.5V Vpin2 2.7V, Vpin1 1.1V Vpin2 2.3V, Vpin1 Vpin2 2.3V, Vpin2 2.7V, (Note pin1 (Note1) (Note Vpin3 ISINK ISINK ISINK ISINK (Note (Note 2.85 0.05 -0.1 -1.0 -3.0 0.08 13.5 13.0 3.15 2.58 VREF VREF VREF IREF IREF 20mA -100 -180 Symbol Test Conditions Units
2.42 -0.5
Operating Supply Current (OPR) Vpin3 Vpin2 Zener Voltage ICC=25 Adjust above start threshold before setting 15V. Note Parameter measured trip point latch with Vpin2=0. Note Gain defined A=Vpin1/Vpin3 Vpin3 0.8V. Note These parameters, although guaranteed, 100% tested production.
BEIJING ESTEK ELECTRONICS CO.,LTD
functions
Function COMP ISENSE RT/CT GROUND OUTPUT Vref Description This Error Amplifier output made loop compensation. This inverting input Error Amplifier. normall connected switching power supply output through resistor divider. voltage proportional inductor current connected this input. uses this information terminate output switch conduction. oscillator frequency maximum Output duty cycle programmed connecting resistor Vref capacitor ground. This combined control circuitry power ground. This output directly drives gate power MOSFET. Peak currents sourced sink this pin. This positive supply integrated circuit. This reference output. provides charging current capacitor through resistor
Application information
2.5V
COMP
Figure Error Configuration
ON/OFF COMMAND
MIK3842 MIK3843 MIK3844 MIK3845
13mA
VOFF
8.4V 7.6V
0.2mA
VOFF
During UVLO, Output
Figure Undervoltage Lockout
ERROR
CURRENT SENSE COMPARATOR
COMP
CURRENT SENSE
Peak current determined
1.0V
Figure Current Sense Circuit
BEIJING ESTEK ELECTRONICS CO.,LTD
VREF RSLOPE ISENSE
VREF
MIK3842 RSLOPE
MIK3842
ISENSE
Figure Slope Compensation Techniques
must selected holding current less than 0.5mA. simple transistor circuit used place shown.
Figure Latched Shutdown
From COMP
From
COMP
Error compensation circuit stabilizing current-mode topology except boost flyback converters operating with continuous inductor current. Error compensation circuit stabilizing current-mode boost flyback topologies operating with continuous inductor current.
Figure Error Amplifier Compensation
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Figure External Clock Synchronization
Figure Soft-Start Circuit
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Typical Performance Characteristics
500pF 10nF
200pF
10nF
100pF
KHz)
KHz)
Figure Timing Resistor Oscillator Frequency.
Figure Output Dead-Time Oscillator Frequenc
(dB)
100K
3.3nF
Figure Maximum Output Duty Cycle Timing Resistor (MIK3842/4
100K
(Hz)
Figure Error Open-Loop Gain equency
(mA)
Figure Current Sense Input Threshold Error Output Voltage.
Figure Reference Short Circuit Current Temperature.
BEIJING ESTEK ELECTRONICS CO.,LTD
Vsat
Sourse Saturation (Load Ground)
Pulsed Load 120Hz
Sink tura tion
3.3nF
Figure Current
Figure Voltag
Output Saturation Voltage Load
Supply Current Supply
Vref OUTPUT SMALL LARGE
Figure Oscillator Output Waveforms
OUTPUT OUTPUT CLOCK OSCILLATOR LARGE SMALL
Ordering Information
RDERI 3842 6A06-6A07 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing Postalcode:100039 Tel: 86-010-58895780 Http://www.estek.com.cn Email:sales@estek.com.cn No:01-060815
BEIJING ESTEK ELECTRONICS CO.,LTD
KA3842/
Address
010-58895793

Start-Up Operating Current High Current Totem Pole Output Undervoltage

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