ISL6227 datasheet(13/27 Pages) RENESAS

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Block Diagram

ERROR AMP 1

VHYS = 15mV

VSEN1

HYSTERETIC COMPARATOR 1

MODE CHANGE COMP 1

300k



PWM1

+ 0.9V

ISEN1

140



SAMPLE

CURRENT

SAMPLE

CURRENT

PHASE1

PGND1

UGATE1

BOOT1

LGATE1

VCC

0.9V REFERENCE

OCSET1

1/2.9

OCSET1

1/33.1

ISEN1

ERROR AMP 2

ADAPTIVE DEAD-TIME

VHYS = 15mV

VSEN2

HYSTERETIC COMPARATOR 2

MODE CHANGE COMP 2



15pF

1.25pF

500k



300k



PWM2

0.9V

ISEN2

140



SAMPLE

CURRENT

SAMPLE

CURRENT

PHASE2

PGND2

UGATE2

BOOT2

LGATE2

VCC

DIODE EMULATION

V/I SAMPLE TIMING

0.9V REFERENCE

OCSET2

1/2.9

OCSET2

1/33.1

ISEN2

DDR

VIN

VCC

DUTY CYCLE RAMP GENERATOR

PWM CHANNEL PHASE CONTROL

OC2

OC1

DDR = 0

DDR = 1

DDR VTT

DDR = 0

DDR = 1

8 CLOCK CYCLES

SAME STATE FOR

REQUIRED TO LATCH

OVERCURRENT FAULT

8 CLOCK CYCLES

SAME STATE FOR

REQUIRED TO CHANGE

PWM OR HYS MODE

8 CLOCK CYCLES

SAME STATE FOR

REQUIRED TO CHANGE

PWM OR HYS MODE

8 CLOCK CYCLES

SAME STATE FOR

REQUIRED TO LATCH

OVERCURRENT FAULT

VCC

PG1

REFERENCE

OV UV

PGOOD

DDR VREF

BUFFER AMP

DDR = 1

DDR = 0

1.25pF

500k



15pF

OV UV

PGOOD

VOUT1

VOUT2

PWM/HYS TRANSITION

ADAPTIVE DEAD-TIME

DIODE EMULATION

V/I SAMPLE TIMING

PWM/HYS TRANSITION

VOLTS/SEC

CLAMP

VOLTS/SEC

CLAMP

OC1 DDR

POR

FAULT LATCH

BIAS SUPPLIES

REFERENCE

ENABLE

SOFT-START

GND

EN1

EN2

REF/PG2

SOFT1

SOFT2

DDR MODE

CONTROL

OC2

REF

(200k

, DDR = 1)

4.4k



4.4k



DDR EN1 EN2

VIN

CH1/CH2



28.0V

180°

4.2 <

VIN < 28.0V

VIN < 4.2

90°

0°

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