APW7098 데이터 시트보기 (PDF) - Anpec Electronics

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APW7098

T wo- Phase Buck PWM Controller with Integrated MOSFET Drivers

Anpec Electronics 

APW7098

Operating Waveforms (Cont.)

Short-Circuit Test Before Power On

RSEN=1.5kΩ

L=0.56µH

DCR=4mΩ

IL1

1

IL2

2

VSS

3

4

VOUT

CH1: IL1 (10A/div)

CH2: IL2 (10A/div)

CH3: VSS (5V/div)

CH4: VOUT (1V/div)

Time: 5ms/div

OVP After Power On

Pull-Up VFB > V OV

VFB

1

VSS

VLG1

2

3

VLG2

4

CH1: VFB (1V/div)

CH2: VSS (2V/div)

CH3: VLG1 (10V/div)

CH4: VLG2 (10V/div)

Time: 100µs/div

Pin Description

PIN

NO.

NAME

1

UGATE1

2

BOOT1

3

5VCC

4

AGND

5

MODE

6

CSP1

7

CSN1

8

CSN2

9

CSP2

FUNCTION

High-side Gate Driver Output for channel 1. Connect this pin to the gate of high-side MOSFET.

This pin is monitored by the adaptive shoot-through protection circuitry to determine when the

high-side MOSFET has turned off.

Bootstrap Supply for the floating high-side gate driver of channel 1. Connect the Bootstrap

capacitor between the BOOT1 pin and the PHASE1 pin to form a bootstrap circuit. The bootstrap

capacitor provides the charge to turn on the high-side MOSFET. Typical values for CBOOT ranged

from 0.1µF to 1µF. Ensure that CBOOT is placed near the IC.

Internal Regulator Output. This is the output pin of the linear regulator, which is converting power

from VCC and provides output current up to 20mA minimums for internal bias and external usage.

Signal Ground for the IC. All voltage levels are measured with respect to this pin. Tie this pin to the

ground island/plane through the lowest impedance connection available.

Operation Phase Selection Input. Pulling this pin lower than 0.64V sets two-phase operation with

both channels enabled. Pulling this pin higher than 0.8V sets single-phase operation with the

channel 2 disabled. Once operating in single-phase mode, the operation mode is latched. It is

required to toggle SS, REFIN/EN, or 5VCC pin to reset the IC.

Positive Input of current sensing Amplifier for channel 1. This pin combined with CSN1 senses the

inductor current through an RC network.

Negative Input of current sensing amplifier for channel 1. This pin combined with CSP1 senses

the inductor current through an RC network.

Negative Input of current sensing amplifier for channel 2. This pin combined with CSP2 senses

the inductor current through an RC network.

Positive Input of current sensing Amplifier for Channel 2. This pin combined with CSN2 senses the

inductor current through an RC network.

Copyright © ANPEC Electronics Corp.

11

Rev. A.6 - Oct., 2009

www.anpec.com.tw

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