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APW7098 Datasheet(PDF) 11 Page - Anpec Electronics Coropration

Part No. APW7098
Description  Two- Phase Buck PWM Controller with Integrated MOSFET Drivers
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Maker  ANPEC [Anpec Electronics Coropration]
Homepage  http://www.anpec.com.tw
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APW7098 Datasheet(HTML) 11 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.6 - Oct., 2009
APW7098
www.anpec.com.tw
11
Operating Waveforms (Cont.)
Short-Circuit Test Before Power On
R
SEN=1.5kΩ
L=0.56
µH
DCR=4m
CH1: I
L1 (10A/div)
CH2: I
L2 (10A/div)
CH3: V
SS (5V/div)
CH4: V
OUT (1V/div)
Time: 5ms/div
1
2
3
4
I
L1
I
L2
V
SS
V
OUT
OVP After Power On
Pull-Up V
FB > V OV
CH1: V
FB (1V/div)
CH2: V
SS (2V/div)
CH3: V
LG1 (10V/div)
CH4: V
LG2 (10V/div)
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
capacitor provides the charge to turn on the high-side MOSFET. Typical values for CBOOT ranged
from 0.1
µF to 1µF. Ensure that C
BOOT is placed near the IC.
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.


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