Copyright

© ANPEC Electronics Corp.

Rev. A.7 - Oct., 2011

APW7098

www.anpec.com.tw

11

Operating Waveforms (Cont.)

Short-Circuit Test Before Power On

R

L=0.56

µH

DCR=4m

Ω

CH1: I

CH2: I

CH3: V

CH4: V

Time: 5ms/div

1

2

3

4

I

L1

I

L2

V

SS

V

OUT

OVP After Power On

Pull-Up V

CH1: V

CH2: V

CH3: V

CH4: V

Time: 100

µs/div

1

2

3

4

V

FB

V

SS

V

LG1

V

LG2

Pin Description

PIN

NO.

NAME

FUNCTION

1

UGATE1

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.

2

BOOT1

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

from 0.1

µF to 1µF. Ensure that C

3

5VCC

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.

4

AGND

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.

5

MODE

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.

6

CSP1

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

inductor current through an RC network.

7

CSN1

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

the inductor current through an RC network.

8

CSN2

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

the inductor current through an RC network.

9

CSP2

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

inductor current through an RC network.