AIC1401 Analog Intergrations Corporation, AIC1401 Datasheet - Page 4

• Manufacturer Part Number: AIC1401
• Description: PWM Step-Down Switching Controller with Shutdown
• Manufacturer: Analog Intergrations Corporation

n
n
PIN DESCRIPTIONS
PIN 1: OCSET- Current limit sense pin. Connect
PIN 2: /SHDN - Shutdown pin. Connect this pin
PIN 3: COMP - External compensation pin. This
APPLICATION CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT
a resistor R
the
MOSFET. R
200 A current source (I
and the external MOSFET on-
resistance (R
the
according
equation:
If FB pin voltage is sensed to be
below
voltage
overcurrent comparator cycles
the soft-start function.
to ground for shutdown.
pin
amplifier
I
PEAK
is
drain
overcurrent
I
OCSET
50%
connected
OCSET
output
R
to
DS(ON)
OCSET
reference,
of
DS(ON)
of
R
OCSET
from this pin to
the
, an internal
the
) jointly set
the
and
trip
to
following
external
internal
OCSET
PWM
point
error
the
),
PIN 4: FB
PIN 5: GND
PIN 6: LX
PIN 7: UG
PIN 8: VCC
- The
- Ground pin.
- Overcurrent
- External MOSFET gate drive pin.
- The chip power supply pin.
comparator. A 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.
Connect the LX pin to source of
the external N-MOSFET. This
pin detects the voltage drop
across the MOSFET R
overcurrent protection.
Connect this pin to gate of the
external MOSFET.
Recommended supply voltage is
12V.
error
to
amplifier
detection
AIC1401
FB
DS(ON)
inverting
pin
pin.
4
for
to