PM6680A evaluation order code: STEVAL-ISA053V1. PM6680 dual step-down
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PM6680 evaluation dual step-down controller with auxiliary voltages notebook power system
PM6680A evaluation order code: STEVAL-ISA053V1. PM6680 dual step-down controller with adjustable output voltages notebook computer power systems. PM6680 evaluation designed test performance PM6680 employing typical application circuit that allows testing PM6680 device functions. features switching sections, with (typically) 1.05 outputs, from input battery voltage. operating switching frequency switching sections kHz, respectively. Each switching section delivers more than output current. Moreover, internal linear regulator provide peak current. Figure PM6680 evaluation
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April 2008
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Contents
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Contents
Main features Evaluation schematic Component list Evaluation board layout interface Recommended equipment Quick start Jumper settings Feedback output connections Test setup performance summary
10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 Test setup Power-up Soft-start shutdown waveforms 1.05 output efficiency load current Power consumption analysis Switching frequency load current Linear regulator output voltages output current Load transient responses
Representatives waveforms Revision history
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List figures
List figures
Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure PM6680 evaluation Evaluation schematic PM6680 evaluation board layout layer (PGND plain component side) PM6680 evaluation board layout inner layer (SGND layer plane) PM6680 evaluation board layout inner layer (SGND layer signals) PM6680 evaluation board layout bottom layer (PM6680 component side) LDO5 power-up Section soft-start waveforms Section soft-start waveforms Section shutdown waveforms Section shutdown waveforms SMPS efficiency 1.05 SMPS efficiency Input current input voltage. Input current input voltage. Input current input voltage. Device current consumption input voltage Device current consumption input voltage output switching frequency load current 1.05 output switching frequency load current LDO5 output load current SMPS load transient response SMPS 1.05 load transient response SMPS pulse skip mode. SMPS no-audible skip mode SMPS mode
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List tables
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List tables
Table Table Table Table Table Table Table Table Table Table Component list test points evaluation board. Jumper V5SW connections Jumper FSEL connections Jumper SKIP connections Jumper Jumper Jumper Jumper Document revision history
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Main features
Main features
Constant on-time control allows very fast load transients input voltage range auxiliary output voltage Adjustable switching outputs Lossless current sensing using side MOSFET RDS(on) Negative current limit Soft-start internally fixed Soft-end output discharge kHz, kHz, selectable switching frequency) Selectable pulse skip no-audible skip modes light loads Independent power good signals
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Evaluation schematic
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Evaluation schematic
Figure Evaluation schematic
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Component list
Table
Name C13, C15, C17, CREF C24,C25 D2,D3
Component list
Component list
Description Ceramic capacitor Ceramic capacitor Ceramic capacitor capacitor capacitor capacitor capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Tantalum capacitor Ceramic capacitor Tantalum capacitor package Ceramic capacitor Ceramic capacitor Ceramic capacitor Electrolytic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Tantalum capacitor Dual Schottky diode Diode PM6680 device Size 1210 1210 0805 case case case case 0805 0603 0603 0805 case 0603 case 0805 0805 0603 0603 0805 0805 3216 SOT23 DO216-AA VFQFPN-32 Value installed installed installed installed installed installed installed Standard Standard POSCAP Sanyo Standard POSCAP Sanyo Standard Standard Standard Standard Standard Standard Standard Standard Sanyo Standard Standard Standard Standard STMicroelectronics STMicroelectronics STMicroelectronics BAT54A STPS1L30M PM6680 25SVPD39M THJB475*016#JN B37941K5104K62 TPSC475*035#0600 4TPD33OM 4TPD33OM Supplier Taiyo Yuden Part number UMK325BJ106KM
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Component list Table
Name R7,R8 R10,R11 R12,R13, R14,R15 R18,R19 R20, R21, R22, RLD5V, RLD3V
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Component list (continued)
Description inductor, sat. inductor, sat. MOSFET control SO-8 MOSFET control SO-8 MOSFET Sync SO-8 MOSFET Sync SO-8 Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Size SO-8 SO-8 SO-8 SO-8 0805 0805 0805 0805 0805 0805 0805 0805 0805 0603 0603 0603 0603 1206 0805 0805 0805 0805 0805 0805 0805 0805 installed installed installed installed Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Value Supplier Coilcraft Coilcraft STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Standard Part number MLC1538-152ML MLC1550-252ML STS12NH3LL STS12NH3LL STS12NH3LL STS12NH3LL
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Evaluation board layout
Evaluation board layout
Figure PM6680 evaluation board layout layer (PGND plain component side)
Figure
PM6680 evaluation board layout inner layer (SGND layer plane)
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Evaluation board layout Figure
AN2566 PM6680 evaluation board layout inner layer (SGND layer signals)
Figure
PM6680 evaluation board layout bottom layer (PM6680 component side)
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interface
interface
evaluation board following test points. Table test points evaluation board
Description Input voltage Input voltage ground linear regulator output used this device external input OUT1 switching section output OUT1 switching section output ground OUT1 switching section power good OUT2 switching section output OUT2 switching section output ground OUT2 switching section power good Junction between PGND SGND planes
Test point VIN+ VINLDO5 LDO_ADJ EXT5V OUT1+ OUT1PGOOD1 OUT2+ OUT2+ PGOOD2
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Recommended equipment
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Recommended equipment
power supply, notebook computer battery adapter Active loads Digital multimeter four-trace oscilloscope
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Quick start
Quick start
Connect VIN+ VIN- test points evaluation board external power supply. Ensure that switches (S2) "OFF" position. this condition outputs disabled (shutdown mode). Turn "ON" position (SHDN high). This turns LDO5 output (standby-mode). Turn "ON" position (EN1 high). switching controller begins regulation output. PGOOD1 goes high after soft-start. Turn "ON" position (EN2 high). 1.05 switching controller begins regulation output. PGOOD2 goes high after soft-start. order load switching outputs, loads must connected between output test points, respectively. order load linear outputs, loads must connected between LDO5 alternative RLD5V resistors used evaluation board.
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Jumper settings
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Jumper settings
possible select different working conditions using jumpers board.
Note:
Jumpers S1,S6, already soldered evaluation board necessary change them. Please refer schematic verify their proper connection. external bypass connections linear regulator LDO5 connecting V5SW jumper indicated Table below. Table Jumper V5SW connections
LDO5 working conditions When main output voltage greater than boostrap-switchover threshold, internal (max) P-channel MOSFET switch connects V5SW LDO5 shutting down LDO5 internal linear regulator. used, must tied ground. internal linear regulator LDO5 always this case LDO5 supplies gate drivers internal circuitry. provide output peak current EXT5V internal linear regulator LDO5 remains alternative external voltage applied EXT5V test-point. internal (max) Pchannel MOSFET switch connects V5SW LDO5 output. gate drivers internal circuitry supplied same external voltage applied.
Position OUT5V
SGND
FSEL connected jumper select SMPS frequency. jumper positions corresponding frequencies shown Table below. Table Jumper FSEL connections
Position SGND SMPS OUT1 SMPS OUT2
VREF
LDO5
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Jumper settings select switching operation mode SMPS, connect SKIP jumper described Table Table Jumper SKIP connections
Switching operating mode SKIP tied ground, pulse skip mode takes place light loads. zero crossing comparator prevents inductor current from going negative.
Position
VREF SKIP tied VREF enables pulse skip mode with minimum switching frequency about (ultrasonic mode). LDO5 SKIP tied fixed mode takes place. switching output position sink source current from load.
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Feedback output connections
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Feedback output connections
Table Table below illustrate jumper settings loop compensation network very output voltage ripple. Table
Position Short
Jumper
Output ripple compensation Virtual output ripple generated using compensation network connected between output PHASE switching section.
Table
Position
Jumper
Feedback connection
Controller feedback signal connected compensation network
Table Table describe settings loop compensation network high output voltage ripple. Table
Position Open
Jumper
Output ripple compensation output ripple used.
Table
Position
Jumper
Feedback connection
Controller feedback signal connected directly output capacitor.
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Test setup performance summary
10.1
Test setup performance summary
Test setup
PM6680 evaluation board following input/output connections: input through J5-J2 (VIN+ VIN-) SMPS output through J4-J13 (OUT1+ OUT1-) 1.05 SMPS output through J1-J12 (OUT2+ OUT2-) linear regulator output through (LDO5)
power supply capable supplying least should connected VIN+, VIN- active loads should connected respectively OUT1+, OUT1- OUT2+, OUT2-.
10.2
Power-up
shown Figure power-up starts when input voltage applied voltage SHDN above device "on" threshold. First, LDO5 goes with masking time about Figure LDO5 power-up
SHDN
LDO5
VREF
10.3
Soft-start shutdown waveforms
Figure show soft-start waveforms. Figure show shut down waveforms. PM6680 independent internal digital soft-start each switching section. During soft-start phase internal current limit increases from 100%, increments 25%, avoid inductor current reaching high value.
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Test setup performance summary Figure Section soft-start waveforms
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OUT1
Figure
Section soft-start waveforms
OUT2
Driving SHDN below SHDN device "off" threshold will cause device enter shutdown mode. this case switching outputs connected ground through internal power MOSFET discharged softly, (discharge mode). When output voltages reach side MOSFETs turned quickly discharging them ground.
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AN2566 Figure Section shutdown waveforms
Test setup performance summary
OUT1
Lgate1
Figure Section shutdown waveforms
OUT2
Lgate2
10.4
1.05 output efficiency load current
Figure Figure show efficiency versus load current different input voltage values mode, skip mode no-audible skip mode.
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Test setup performance summary Figure SMPS efficiency
1.5V OUTPUT EFFICIENCY LOAD CURRENT
EFFICIENCY
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SKIP, VIN=10.8V SKIP, VIN=14.4V PWM, VIN=10.8V PWM, VIN=14.4V AUD., VIN=10.8V VIN=14
0.01
LOAD CURRENT
Figure 1.05 SMPS efficiency
1.05V OUTPUT EFFICIENCY LOAD CURRENT
EFFICIENCY 0.01
SKIP, VIN=10.8V SKIP, VIN=14.4V PWM, VIN=10.8V PWM, VIN=14.4V AUD., VIN=10.8V VIN=14
LOAD CURRENT
10.5
Power consumption analysis
measure device consumption under real working conditions, external power supply connected EXT5V. traces figures that follow show differentiation between input currents. Once internal linear regulator turned device consumption will increase consequence. Figure shows input current consumption measured VIN+ (includes ISHDN) input device current consumption measured pin. Both switching sections working forced mode. load applied outputs.
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AN2566 Figure Input current input voltage
Test setup performance summary
Figure shows input current consumption measured VIN+ (includes ISHDN) input device current consumption measured pin(IEXT5V). Both switching sections working SKIP mode. load applied. Figure Input current input voltage
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Test setup performance summary
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Figure shows input current consumption measured VIN+ (includes ISHDN) input device current consumption measured pin(IEXT5V). Both switching sections working NO-AUDIBLE SKIP mode. load applied. Figure Input current input voltage
following illustrations, device current consumption measured shutdown mode standby mode. shutdown mode outputs (SHDN low). standby mode only linear regulator output (V5SW SGND, SHDN high, pins low). Figure Device current consumption input voltage
SHUTDOWN MODE INPUT BATTERY CURRENT INPUT VOLTAGE 25.00
20.00 15.00 10.00 5.00 0.00 INPUT VOLTAGE
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Test setup performance summary Figure Device current consumption input voltage
STANDBY MODE INPUT BATTERY CURRENT INPUT VOLTAGE
INPUT VOLTAGE
10.6
Switching frequency load current
Figure Figure show switching frequency variation with load current mode, skip mode no-audible skip mode. applied VIN+ VIN- test points. Figure output switching frequency load current
1.5V SWITCHING FREQUENCY LOAD CURRENT
0.01
AUD. SKIP SKIP
LOAD CURRENT
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Test setup performance summary Figure 1.05 output switching frequency load current
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1.05V SWITCHING FREQUENCY LOAD CURRENT
AUD. SKIP SKIP
0.01
LOAD CURRENT
10.7
Linear regulator output voltages output current
Figure shows load regulation internal linear regulator LDO5. Both switching sections disabled applied VIN+ VIN- test points. Figure LDO5 output load current
LDO5 OUTPUT CURRENT
4.9890 4.9880 4.9870 4.9860 4.9850 4.9840 4.9830 4.9820 4.9810 4.9800 4.9790 LOAD CURRENT [mA]
10.8
Load transient responses
following figures show load transient response from both switching outputs. each these cases PM6680 works forced mode (the SKIP high).
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Test setup performance summary Figure SMPS load transient response
OUT1
Vphase
Figure SMPS 1.05 load transient response
OUT2
Vphase
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Representatives waveforms
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Representatives waveforms
following illustrations show relevant waveforms switching section provided underline behavior device pulse skip mode, no-audible skip mode forced mode working conditions. Figure SMPS pulse skip mode
Figure SMPS no-audible skip mode
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AN2566 Figure SMPS mode
Representatives waveforms
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Revision history
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Revision history
Table
Date 20-Aug-2007 05-Mar-2008 07-Apr-2008
Document revision history
Revision Initial release Changed: Figure Modified: Table Minor text changes Modified: Introduction Changes
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