ADP1877 datasheet(7/32 Pages) AD

Part #	ADP1877

Description	Dual Output Synchronous Buck PWM Controller With Tracking

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ADP1877

Rev. 0 | Page 7 of 32

SIMPLIFIED BLOCK DIAGRAM

DUPLICATE FOR

CHANNEL 2

BST1

PGND1

+

–

+

–

+

–

+

–

+

–

+

–

FB1

0.6V

OV

UV

PGOOD1

CURRENT SENSE

AMPLIFIER

DH1

DL1

ILIM1

SW1

VREF = 0.6V

6.5µA

+

–

ERROR

AMPLIFIER

FB1

COMP1

SS1

PWM

COMPARATOR

SLOPE COMP AND

RAMP GENERATOR

CURRENT

LIMIT

CONTROL

VCCO

RAMP1

50µA

3.2V

Gm

OV1

+

TRK1

CS GAIN

DRIVER LOGIC

CONTROL AND

STATE

MACHINE

OVER_LIM1

PULSE SKIP

OVER_LIM1

LDO

LOGIC

EN1

EN2

VIN

UVLO

OSCILLATOR

FREQ

SYNC

PH1

PH2

REF

VCCO

OV

UV

0.6V

THERMAL

SHUTDOWN

AGND

0.6V

+

–

+

–

VCCO

VDL

FAULT

OV1

LOGIC

OVER_LIM1

OV1

EN1

EN1_SW

LOGIC

UV1

1kΩ

0.9V

DCM

ZERO CROSS

DETECT

10kΩ

AV = 3, 6, 12, 24

VCCO

SYNC

DL

DRIVER

EN1_SW

EN2_SW

1MΩ

–

+

Figure 3. Block Diagram

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