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SS6341CSTR 数据表(PDF) 5 Page - Silicon Standard Corp.

部件名 SS6341CSTR
功能描述  High Performance, Triple-Output, Auto-Tracking Combo Controller
PDF  14 Pages
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制造商  SSC [Silicon Standard Corp.]
网页  http://www.siliconstandard.com
标志 SSC - Silicon Standard Corp.

SS6341CSTR 数据表(HTML) 5 Page - Silicon Standard Corp.

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SS6341
n PIN DESCRIPTIONS
Pin 1:
PHASE:
Over-current detection pin. Connect
to
the
source
of
the
external
high-side
N-MOSFET.
This
pin
detects the voltage drop across the
high-side N-MOSFET RDS(ON) for
over-current protection.
Pin 2:
UGATE:
External high-side N-MOSFET gate
drive pin. Connect to the gate of the
external high-side N-MOSFET.
Pin 3:
SD:
To shut down the system, active high
or floating. If connecting a resistor to
ground, keep the resistor less than
4.7K
Ω.
Pin 4:
VCC:
The chip power supply pin. It also
provides the gate bias charge for all
the MOSFETs controlled by the IC.
Recommended supply voltage is
12V.
Pin 5:
SS:
Soft-start pin. Connect a capacitor
from
this
pin
to
ground.
This
capacitor, along with an internal
10
µA (typically) current source, sets
the soft-start interval of the converter.
Pulling this pin low will shut down the
IC.
Pin 6:
FB2:
Connect this pin to a resistor divider
to set the linear regulator output
voltage.
Pin 7:
VIN2:
Connect this pin to a suitable
3.3V source. Additionally, this
pin is used to monitor the 3.3V
supply. If the voltage drops
below 2.6V (typically) following a
start-up cycle, the chip shuts
down. A new soft-start cycle is
initiated upon the return of the
3.3V
supply
above
the
under-voltage threshold.
Pin 8:
GATE2:
Linear Controller output drive pin.
This
pin
can
drive
either
a
Darlington NPN transistor or an
N-channel MOSFET.
Pin 9:
GND:
Signal GND for IC. All voltage levels
are measured with respect to this
pin.
Pin 10: GATE3:
Linear Controller output drive pin.
This
pin
can
drive
either
a
Darlington NPN transistor or an
N-channel MOSFET.
Pin 11: FB3
Negative feedback pin for the linear
controller error amplifier. Connect
this pin to a resistor divider to set the
linear controller output voltage.
Pin 12: COMP1
External
compensation
pin.
Connect to the error amplifier output
and
PWM
comparator.
An
RC
network is connected to FB1 to
compensate the voltage control
feedback loop of the converter.
Pin 13: FB1
The error amplifier inverting input pin.
The FB1 pin and COMP1 pin are
used
to
compensate
the
voltage-control feedback loop.
Pin 14: OCSET:
Current limit sense pin. Connect a
resistor ROCSET from this pin to the
drain
of
the
external
high-side
N-MOSFET.
ROCSET,
an
internal
200
µA current source (IOCSET), and
the upper N-MOSFET on-resistance
(RDS(ON)) set the over-current trip
point according to the following
equation:
I
I
R
R
PEAK
OCSET
OCSET
DS(ON)
=
×
Pin 15: PGND:
Driver power GND pin. Connect to a
low impedance ground plane close
to the lower N-MOSFET source.
Pin 16: LGATE:
Lower N-MOSFET gate drive pin.
Rev.2.01 6/26/2003



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