AIC1574 Ver la hoja de datos (PDF) - Analog Intergrations
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AIC1574
Analog Intergrations
AIC1574 Datasheet PDF : 20 Pages
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Pin 12:SS:
Soft-start pin. Connect a ca-
pacitor from this pin to ground.
This capacitor, along with an
internal 25µA (typically) cur-
rent source, sets the soft-start
interval of the converter. Pulling
this pin low will shut down the
IC.
Pin 13: FAULT/RT: Frequency adjustment pin.
Connecting a resistor (RT)
from this pin to GND, increas-
ing the frequency. Connecting
a resistor (RT) from this pin to
VCC, decreasing the frequen-
cy by the following figure (Fig.
4).
This pin is 1.26V during normal
operation, but it is pulled to
VCC in the event of an over-
voltage or over-current condition.
f
=
f0 1 +
25.2K
RT
,
RT
pulled
to
GND
f
=
f0
1
−
VCC
5
− 1.26V
× RT
,
RT
pulled to VCC,
where f0 is free run frequency.
Pin14:
VSEN4: Connect this pin to
the 1.8V linear regulator’s output.
This pin is monitored for under-
voltage events.
Pin15:
DRIVE4: Connect this pin to
the Gate of the external N-MOS to
drive for the 1~8V power.
Pin 16: VAUX: This pin provides boost current for
the linear regulator’s output. The
voltage at this pin is also moni-
tored for power-on-reset purpose.
AIC1574
Pin 17: GND:
Signal GND for IC. All voltage lev-
els are measured with respect to
this pin.
Pin 18: DRIVE3: Connect this pin to the Gate of
the external N-MOS for providing
1.5V power to GTL bus.
Pin 19: VSEN3:
Connect this pin to
the 1.5V linear regulator’s output.
This pin is monitored for under-
voltage events.
Pin 20: NC: Not Connected.
Pin 21: FB:
The error amplifier inverting input
pin.
Pin 22: VSEN1: Converter output voltage sense
pin. Connect this pin to the con-
verter output. The PGOOD and
OVP comparator circuits use
this signal to report output volt-
age status and for over-voltage
protection function.
Pin 23: OCSET:Current limit sense pin. Connect
a resistor ROCSET from this pin
to the drain of the external high-
side N-MOSFET. ROCSET, an in-
ternal 200µA current source
(IOCSET), and the upper N-
MOSFET on-resistance (RDS(ON))
set the over-current trip point
according to the following equa-
tion:
IPEAK = IOCSET × ROCSET
RDS(ON)
Pin 24:PGND: Driver power GND pin. PGND
should be connected to a low
impedance ground plane in
close to lower N-MOSFET
source.
11
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