ADP1878ACPZ-0.6-R7 datasheet(17/40 Pages) AD

номер детали	ADP1878ACPZ-0.6-R7

подробное описание детали	Synchronous Buck Controller

PDF	40 Pages

Scroll/Zoom	100%

производитель	AD [Analog Devices]

домашняя страница	http://www.analog.com

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17 / 40 page

Data Sheet

ADP1878/ADP1879

Rev. A | Page 17 of 40

THEORY OF OPERATION

BLOCK DIAGRAM

Figure 64. ADP1878/ADP1879 Block Diagram

The ADP1878/ADP1879 are versatile current-mode, synchronous

step-down controllers that provide superior transient response,

optimal stability, and current-limit protection by using a constant

on time, pseudo fixed frequency with a programmable current

sense gain, current control scheme. In addition, these devices offer

optimum performance at low duty cycles by using a valley, current-

mode control architecture. This allows the ADP1878/ADP1879

to drive all N-channel power stages to regulate output voltages

to as low as 0.6 V.

DRVH

GND

IREV

COMP

ADP1878/ADP1879

R (TRIMMED)

VREG

tON TIMER

tON = 2RC(VOUT/VIN)

INFORMATION

SW FILTER

STATE

MACHINE

TON

BG_REF

IN_PSM

IN_SS

PWM

COMP

HS_0

LS_0

IREV

LEVEL

SHIFT

VREG

300kΩ

800kΩ

8kΩ

DRVL

PGND

BST

VIN

PSM

REF_ZERO

IN_HICCUP

COMP

ERROR

AMP

SS_REF

0.6V

LOWER

COMP

CLAMP

REF_ZERO

AMP

PWM

COMP

VREG

ISS

0.4V

ADC

RES DETECT AND

GAIN SET

CS GAIN SET

BIAS BLOCK

AND REFERENCE

REF

LDO

PRECISION

ENABLE

630mV

TO ENABLE

ALL BLOCKS

RES

530mV

690mV

600mV

PGOOD

THRESHOLD/

HYSTERESIS

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