APW7098
Operating Waveforms (Cont.)
Short-Circuit Test Before Power On
OVP After Power On
VFB
VSS
RSEN=1.5kW
L=0.56mH
DCR=4mW
IL1
Pull-Up VFB > V OV
1
1
VLG1
2
3
IL2
2
VLG2
VSS
VOUT
3
4
4
CH1: IL1 (10A/div)
CH2: IL2 (10A/div)
CH3: VSS (5V/div)
CH4: VOUT (1V/div)
Time: 5ms/div
CH1: VFB (1V/div)
CH2: VSS (2V/div)
CH3: VLG1 (10V/div)
CH4: VLG2 (10V/div)
Time: 100ms/div
Pin Description
PIN
FUNCTION
NO.
NAME
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.
1
UGATE1
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 0.1mF to 1mF. Ensure that CBOOT is placed near the IC.
2
BOOT1
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.
3
4
5VCC
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.
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.
5
MODE
Positive Input of current sensing Amplifier for channel 1. This pin combined with CSN1 senses the
inductor current through an RC network.
6
7
8
9
CSP1
CSN1
CSN2
CSP2
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 ã ANPEC Electronics Corp.
11
www.anpec.com.tw
Rev. A.6 - Oct., 2009
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
