RT9227ACS Просмотр технического описания (PDF) - Richtek Technology

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RT9227ACS

Advanced PWM and Dual Fixed Linear Power Controller

Richtek Technology 

RT9227A

Function Block Diagram

Preliminary

VSEN1

OCSET1

VCC

VSEN3

GATE3

VIN2

VOUT2

FB2

FAULT

_

3.3V

0.3V

_

1.26V

110%

90%

L IN EAR

UN DER

VOLTAGE LUV

115%

200µA

POWER-ON 3.3V

RESET (POR)

VCC

OC2

0.25A

VCC

11µA

5V

0V

SOFT-START

& FAULT

LOGIC

OC1 _

UPPER

DRIVE

INHIBIT

DACOUT

TTL D/A

CONVERTER

(DAC)

GATE

PWM

CONTROL

LOGIC

ERROR

AMP

PWM COMP

OSCILLATOR

LOWER

DRIVE

COMPENSATION

VCC

PGOOD

UGATE1

PHASE1

LGATE1

PGND

GND

SS VID0 VID2 VID4

FB1

VID1 VID3

Functional Pin Description

VCC (Pin 1)

Provide a 12V bias supply for the IC to this pin. This

pin also provides the gate bias charge for all the

MOSFETs controlled by the IC.

VID0, VID1, VID2, VID3, VID4 (Pin 6, 5, 4, 3, and 2)

VIDO-4 are the input pins to the 5-bit DAC. The

states of these five pins program the internal voltage

reference, DACOUT. The level of DACOUT sets the

core converter output voltage. It also sets the core

PGOOD and OVP thresholds. Table 1 specifies the

DACOUT voltage of 32 combinations of VID levels.

PGOOD (Pin 7)

PGOOD is an open collector output used to indicate

the status of the output voltage. This pin is pulled low

www.richtek-ic.com.tw

4

when the core output is not within ±10% of the

DACOUT reference voltage and the other outputs are

below their under-voltage thresholds.

The PGOOD output is open for ‘11111’ VID codes

that inhibit operation. See table 1.

FAULT (Pin 8)

This pin is low during normal operation, but it is

pulled to about 8V (VCC = 12V) in the event of an

over-voltage or over-current condition.

SS (Pin 9)

Connect a capacitor from this pin to ground. This

capacitor, along with an internal 11µA (VSS >1V)

current source, sets the soft-start interval of the

converter.

DS9227A-02 July 2001

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