AIC1571 AIC [Analog Intergrations Corporation], AIC1571 Datasheet - Page 8

• Manufacturer Part Number: AIC1571
• Description: 5-bit DAC, Synchronous PWM Power Regulator with Dual Linear Controllers
• Manufacturer: AIC [Analog Intergrations Corporation]

GATE3
GATE2
FAULT
BLOCK DIAGRAM
FB2
PIN DESCRIPTIONS
Pin 1: VCC:
Pin 2: VID4:
Pin 3: VID3:
Pin 4: VID2:
Pin 5: VID1:
Pin 6: VID0:
FB3
VIN2
VCC
SS
10µA
4V
+
+
-
The chip power supply pin. It al-
so provides the gate bias charge
for all the MOSFETs controlled
by the IC. Recommended supply
voltage is 12V.
5bit DAC voltage select pin. TTL
inputs used to set the internal
voltage reference VDAC. When
left open, these pins are inter-
nally 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.
START
SOFT
5V
1.26V
INHiBIT
70K
70K
0.3V
70K
70K
70K
VID0
OCSET
VCC
VIN2
-
+
+
VID1
5 BIT TTL D/A
CONVERTER
(DAC)
LOGIC &
ON RESET
VID2
LATCH
FAULT
POWER
OFF
VID3
VID4
LUV
FB1
ERROR
AMP
115%
110%
90%
Pin 8: FAULT:
Pin 7: PGOOD:
+
VSEN
COMP1
+
+
+
+
PWM COMP
OV
OSCILLATOR
RT
OC1
Table 1 specifies the VDAC volt-
age for the 32 combinations of
DAC inputs.
Power
PGOOD is an open drain output.
This pin is pulled low when the
converter output is ±10% out of
the VDAC reference voltage and
the other outputs are below their
under-voltage
PGOOD output is open for VID
codes that inhibit operation. See
Table 1.
This pin is low during normal op-
eration, but it is pulled to VCC in
the event of an over-voltage or
over-current condition.
GATE CONTROL
200µA
PGOOD
+
good
VCC
VCC
thresholds.
VCC
indicator
AIC1571
OCSET
LGATE
GND
PHASE
UGATE
PGND
The
pin.
8