AIC1567 AIC [Analog Intergrations Corporation], AIC1567 Datasheet - Page 6

• Manufacturer Part Number: AIC1567
• Description: 5-bit DAC, Synchronous PWM Power Regulator with Linear Controller
• Manufacturer: AIC [Analog Intergrations Corporation]

PIN DESCRIPTIONS
PIN 2: OCSET - Current limit sense pin. Connect
PIN 3: SS
PIN 4: VID0
PIN 5: VID1
PIN 6: VID2
PIN 7: VID3
PIN 8: VID4
PIN 1: VSEN
PIN 9: COMP - External compensation pin. This
- Converter output voltage sense
- Soft
- 5-bit DAC voltage select pin. TTL
pin. Connect this pin to the
converter output. The PGOOD
and OVP comparator circuits use
this signal to report output
voltage
overvoltage protection function.
a resistor R
the
MOSFET. R
200µA current source (I
the
resistance (R
the
according
equation:
If FB pin voltage is sensed to be
below
voltage reference VDAC, the
over current comparator cycles
the soft-start function.
capacitor from this pin to ground.
An internal 10µA current source
provides soft start function for
the converter.
inputs used to set the internal
voltage reference VDAC. When
left
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
amplifier
I
PEAK
over
open,
is
=
drain
external
start
I
50%
OCS
connected
R
output
status
OCSET
DS ON
×
current
to
OCSET
of
pin.
R
these
DS(ON)
(
of
OCSET
MOSFET
from this pin to
)
the
, an internal
the
) jointly set
the
Connect
and
and
trip
pins
to
OCS
following
external
internal
), and
PWM
point
error
on-
are
for
a
Table 1. Output Voltage Program
PIN 16: PGOOD-Power
PIN 10: FB
PIN 11: CLP
PIN 12: CLN
PIN 13: VLFB - Negative feedback pin for the
PIN 14: LIDRI - Linear regulator output drive pin.
PIN 15: GND
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
- The error amplifier inverting
- Linear regulator current sense
- Linear regulator current sense
- Signal GND. It also serves as
PGOOD is an open drain output.
This pin is pulled low when the
converter output is ±10% out of
the VDAC reference voltage.
comparator. An RC network is
connected
compensate the voltage-control
feedback loop of the converter.
input pin. The FB pin and COMP
pin are used to compensate the
voltage-control feedback loop.
pin. This pin is the positive input
of the current sense comparator.
pin. This pin is the negative input
of the current sense comparator.
linear regulator error amplifier.
This pin can drive either a
Darlington NPN or an N-channel
MOSFET.
the power GND for the upper
gate driver.
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
VID1
good
0
0
1
1
0
0
1
1
0
0
1
1
0
0
to
AIC1567
indicator
VID0
FB
0
1
0
1
0
1
0
1
0
1
0
1
0
1
pin
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
pin.
6
to