AIC1566 AIC [Analog Intergrations Corporation], AIC1566 Datasheet - Page 6

• Manufacturer Part Number: AIC1566
• Description: 4-bit DAC, Simple PWM Power Regulator With Linear Controller
• Manufacturer: AIC [Analog Intergrations Corporation]

PIN DESCRIPTION
PIN 3: VID0
PIN 6: VID3
PIN 1: OCSET - Current limit sense pin. Connect
PIN 2: SS
PIN 4: VID1
PIN 5: VID2
PIN 7: COMP - External compensation pin. This
PIN 8: FB
- Soft
- 4-bit DAC voltage select pin. TTL
- The error amplifier inverting
a resistor R
the
MOSFET. R
200µA current source (I
and the external MOSFET on-
resistance (R
the
according
equation:
If FB pin voltage is sensed to
be below 50% of the internal
voltage reference VDAC, the
over
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 16 combinations
of DAC inputs.
pin
amplifier
comparator. An RC network is
connected
compensate the voltage-control
feedback loop of the converter.
input pin. The FB pin and
COMP
compensate the voltage-control
I
PEAK
over
is
=
open,
drain
start
I
current
OCSET
connected
pin
output
OCSET
R
current
to
DS(ON
OCSET
to
of
pin.
×
these
DS(ON)
are
R
OCSET
from this pin to
the
)
FB
, an internal
the
comparator
) jointly set
and
Connect
trip
used
pins
to
following
pin
external
OCSET
PWM
error
point
are
to
to
),
a
Table 1. Output Voltage Program
PIN 9: CLP
PIN 10: CLN
PIN 11: VLFB
PIN 12: LIDRI - Linear regulator output drive pin.
PIN 13: GND
PIN 14: PGOOD-Power good indicator pin.
PIN 15: PHASE - Over current detection pin.
VID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
- Linear regulator current sense
- Linear regulator current sense
- Negative feedback pin for the
- Signal GND. It also serves as
feedback loop.
pin. This pin is the positive input
of
comparator.
pin. This pin is the negative
input of the current sense
comparator.
linear regulator error amplifier.
This pin can drive either a
Darlington
channel MOSFET.
the power GND for the upper
gate driver.
PGOOD is an open drain output.
This pin is pulled low when the
converter output is 10% out of
the VDAC reference voltage.
Connect the PHASE pin to
source
MOSFET. This pin detects the
voltage
MOSFET
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
the
drop
of
R
NPN
DS(ON)
VID0
current
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
the
AIC1566
across
or
for
VDAC
external
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
2.1V
2.0V
an
sense
over-
the
6
N-