AIC1579 AIC [Analog Intergrations Corporation], AIC1579 Datasheet - Page 6

• Manufacturer Part Number: AIC1579
• Description: Step-Down Switching Regulator Controller
• Manufacturer: AIC [Analog Intergrations Corporation]

PIN 1: OCSET - Current limit sense pin. Connect
PIN 2: SS
PIN 3: COMP - External compensation pin. This
BLOCK DIAGRAM
PIN DESCRIPTIONS
COMP
SS
FB
- Soft
a resistor R
the
MOSFET. R
200 µ A current source (I
and the external MOSFET on-
resistance (R
overcurrent trip point according
to the following equation:
If FB pin voltage is sensed to be
below
voltage reference VDAC, the
overcurrent comparator cycles
the soft-start function.
capacitor from this pin to ground.
An internal 10µA current source
provides soft start function for
the converter.
pin
amplifier
I
PEAK
REF.
=
is
drain
start
10µA
I
4V
50%
OCSET
connected
output
OCSET
R
DS(ON
DS(ON)
OCSET
of
pin.
×
Error
AMP
Start
Soft
of
R
OCSET
from this pin to
) jointly set the
)
, an internal
the
the
Connect
and
to
external
internal
PWM Comparator
OCSET
PWM
error
+
-
),
a
Oscilator
Over Current
Power-ON Reset
PIN 4: FB
PIN 5: GND-
PIN 6: PHASE- Overcurrent
PIN 7: UGATE- External MOSFET gate drive pin.
PIN 8: VCC
Control
Gate
-
+
- The error amplifier inverting
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.
Ground pin.
Connect the PHASE pin to
source
MOSFET. This pin detects the
voltage
MOSFET R
protection.
Connect this pin to gate of the
external MOSFET.
-The chip power supply pin.
Recommended supply voltage is
12V.
200µA
of
drop
AIC1579/L
DS(ON)
VCC
PHASE
OCSET
UGATE
GND
to
the
detection
for overcurrent
FB
across
external
pin
pin.
the
N-
6
to