AIC1567 查看數據表（PDF） - Analog Intergrations
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AIC1567 Datasheet PDF : 7 Pages
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AIC1567
PIN DESCRIPTIONS
PIN 1: VSEN
- Converter output voltage sense
pin. Connect this pin to the
converter output. The PGOOD
and OVP comparator circuits use
this signal to report output
voltage status and for
overvoltage protection function.
PIN 2: OCSET - Current limit sense pin. Connect
a resistor ROCSET from this pin to
the drain of the external
MOSFET. ROCSET, an internal
200µA current source (IOCS), and
the external MOSFET on-
resistance (RDS(ON)) jointly set
the over current trip point
according to the following
equation:
IPEAK
=
IOCS × ROCSET
RDS( ON)
If FB pin voltage is sensed to be
below 50% of the internal
voltage reference VDAC, the
over current comparator cycles
the soft-start function.
PIN 3: SS
PIN 4: VID0
PIN 5: VID1
PIN 6: VID2
PIN 7: VID3
PIN 8: VID4
- Soft start pin. Connect a
capacitor from this pin to ground.
An internal 10µA current source
provides soft start function for
the converter.
- 5-bit DAC voltage select pin. TTL
inputs used to set the internal
voltage reference VDAC. When
left open, these pins are
internally pulled up to 5V and
provide logic ones. The level of
VDAC sets the converter output
voltage as well as the PGOOD
and OVP thresholds.
Table 1 specifies the VDAC
voltage for the 32 combinations
of DAC inputs.
PIN 9: COMP - External compensation pin. This
pin is connected to error
amplifier output and PWM
comparator. An RC network is
connected to FB pin to
compensate the voltage-control
feedback loop of the converter.
PIN 10: FB
- The error amplifier inverting
input pin. The FB pin and COMP
pin are used to compensate the
voltage-control feedback loop.
PIN 11: CLP
- Linear regulator current sense
pin. This pin is the positive input
of the current sense comparator.
PIN 12: CLN
- Linear regulator current sense
pin. This pin is the negative input
of the current sense comparator.
PIN 13: VLFB - Negative feedback pin for the
linear regulator error amplifier.
PIN 14: LIDRI
- Linear regulator output drive pin.
This pin can drive either a
Darlington NPN or an N-channel
MOSFET.
PIN 15: GND - Signal GND. It also serves as
the power GND for the upper
gate driver.
PIN 16: PGOOD-Power good indicator pin.
PGOOD is an open drain output.
This pin is pulled low when the
converter output is ±10% out of
the VDAC reference voltage.
Table 1. Output Voltage Program
VID4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
VDAC
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
2.6V
2.5V
2.4V
2.3V
2.2V
6
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