APW7088 Просмотр технического описания (PDF) - Anpec Electronics
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APW7088 Datasheet PDF : 25 Pages
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APW7088
Pin Description
PIN
NAME
FUNCTION
High-side Gate Driver Output for channel 1. Connect this pin to the gate of high-side MOSFET.
1
UGATE1
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
2
BOOT1
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.
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 20 mA 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
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
5
MODE
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 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.
Load Line (droop) Setting. Connect a resistor between this pin and AGND to set the droop. A
10
DROOP
sourcing current, proportional to output current is present on the DROOP pin. The droop scale
factor is set by the resistors (connected with CSP1, CSP2, and DROOP), resistance of the output
inductors and the internal voltage divider with the ratio of 5%.
This is one of the inputs for the internal DAC that provides the reference voltage for output
11
VID0
regulation. This pin responds to logic threshold. The APW7088 decodes the VID inputs to
establish the output voltage; see VID Tables for correspondence between DAC codes and output
voltage settings. This pin is internally pulled high at floating status.
12
COMP
Error Amplifier Output. Connect the compensation network between COMP, FB, and VOUT for Type
2 or Type 3 feedback compensation.
13
FB
Feedback Voltage. This pin is the inverting input to the error comparator. A resistor divider from
the output to AGND is used to set the regulation voltage.
14
SS
Soft-start Current Output. Connect a capacitor from this pin to AGND to set the soft-start interval.
Pulling the voltage on this pin below 0.5V causes COMP to pull low and then shuts off the output.
15
VID1
One of DAC Inputs, same as VID0 and VID2.
16
POK
Power OK and 1.5V Reference Output. This pin is a reference output used to indicate the status of
the voltages on SS pin and FB pin. POK provides 1.5V reference if VFB> 87.5% of reference (VR).
Bootstrap Supply for the floating high-side gate driver of channel 2. Connect the Bootstrap
17
BOOT2
capacitor between the BOOT2 pin and the PHASE2 pin to form a bootstrap circuit. The bootstrap
capacitor provides the charge to turn on the high-side MOSFET. Typical values for CBOOT range
from 0.1µF to 1µF. Ensure that CBOOT is placed near the IC.
High-side Gate Driver Output for Channel 2. Connect this pin to the gate of high-side MOSFET.
18
UGATE2
This pin is monitored by the adaptive shoot-through protection circuitry to determine when the
high-side MOSFET has turned off.
Switch Node for Channel 2. Connect this pin to the source of high-side MOSFET and the drain of
the low-side MOSFET. This pin is used as sink for UGATE2 driver. This pin is also monitored by
19
PHASE2
the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has
turned off. An Schottky diode between this pin and ground is recommended to reduce negative
transient voltage that is common in a power supply system.
Low-side Gate Driver Output for Channel 2. Connect this pin to the gate of low-side MOSFET.
20
LGATE2
This pin is monitored by the adaptive shoot-through protection circuitry to determine when the
low-side MOSFET has turned off.
Copyright © ANPEC Electronics Corp.
10
Rev. A.4 - Feb., 2009
www.anpec.com.tw
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