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SS6580 데이터시트(PDF) 6 Page - Silicon Standard Corp.

부품명 SS6580
상세설명  Step-Down DC/DC Controller with Shutdown
PDF  8 Pages
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제조업체  SSC [Silicon Standard Corp.]
홈페이지  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6580 데이터시트(HTML) 6 Page - Silicon Standard Corp.

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SS6580/L
n BLOCK DIAGRAM
-
+
-
+
SD
Oscillator
PWM Comparator
Error AMP
COMP
FB
REF
VCC
PHASE
OCSET
UGATE
GND
200
µA
Over Current
Built-In Soft Start
Gate Control
Power-On
Reset
-
+
n PIN DESCRIPTIONS
PIN 1: OCSET - Current limit sense pin. Connect a
resistor ROCSET from this pin to the
drain of the external MOSFET.
ROCSET, an internal 200µA current
source (IOCSET), and the external
MOSFET on-resistance (RDS(ON))
jointly set the over-current trip point
according
to
the
following
equation:
I
I
R
R
PEAK
OCSET
OCSET
DS(ON
=
×
)
If the FB pin voltage is sensed to
be below 50% of the internal
voltage
reference
VDAC,
the
over-current comparator cycles the
soft-start function.
PIN 2: SD
- Shutdown pin. Connect this pin to
ground for shutdown.
PIN 3:COMP
- External compensation pin. This
pin is connected to the error
amplifier
output
and
PWM
comparator. An RC network is
connected
to
the
FB
pin
to
compensate
the
voltage-control
feedback loop of the converter.
PIN 4: FB
- The error amplifier inverting input
pin. The FB pin and COMP pin are
used
to
compensate
the
voltage-control feedback loop.
PIN 5: GND
- Ground pin.
PIN 6: PHASE - Over-current
detection
pin.
Connect the PHASE pin to the
source of the external N-MOSFET.
This pin detects the voltage drop
across the MOSFET RDS(ON) for
over-current protection.
PIN 7: UGATE - External MOSFET gate drive pin.
Connect this pin to the gate of the
external MOSFET.
PIN 8: VCC
- The
chip
power
supply
pin.
Recommended supply voltage is
12V.
Rev.2.01 6/26/2003



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