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SS6341CSTR 데이터시트(PDF) 8 Page - Silicon Standard Corp.

부품명 SS6341CSTR
상세설명  High Performance, Triple-Output, Auto-Tracking Combo Controller
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제조업체  SSC [Silicon Standard Corp.]
홈페이지  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

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SS6341
n BLOCK DIAGRAM
+
+
+
+
+
+
+
+
+
+
POR
-
+
3.6V
Q
R
S
Q
R
S
-
+
0.2V
5V
SD
POR
2.6V
COUNT 3
VIN2
VCC
1.3V
200uA
9.5V
FB2
GATE2
OCSET
COMP1
R
R
Q
S
1.3V
FB3
OSCILLATOR
GATE CONTROL
SS
SLOW DISCHARGE
FAST DISCHARGE
20uA
10uA
ERROR AMP
PWM COMP
200KHz
70K
4V
SS
INHIBIT
LUV
OC1
LUV
OC1
PHASE
UGATE
VCC
PGND
LGATE
VCC
0.3V
1.26V
FB1
GATE3
GND
n APPLICATIONS INFORMATION
The SS6341 is designed for applications with multiple
voltage demand. This IC has one PWM controller and two
linear controllers. The PWM controller is designed to
regulate the voltage (VOUT1) by driving 2 MOSFETs
(through UGATE and LGATE) in a synchronous rectified buck
converter configuration. The regulated voltage level is
decided by a resistor divider network.
The
Power-On
Reset
(POR)
function
continually
monitors the +12V input supply voltage at VCC pin, the
5V input voltage at OCSET pin, and the 3.3V input at
VIN2 pin. The POR function initiates soft-start operation
after all three input supply voltage exceed their POR
thresholds.
Soft-Start
The POR function initiates the soft-start sequence.
Initially, the voltage on the SS pin rapidly increases to
approximate 1V. Then an internal 10µA current source
charges an external capacitor (CSS) on the SS pin to 4V.
As the SS pin voltage slews from 1V to 4V, the PWM
error amplifier reference input (non-inverting terminal)
and output (COMP1 pin) are clamped to a level
proportional to the SS pin voltage. As the SS pin voltage
slews from 1V to 4V, the output clamp generates PHASE
pulses of increasing width that charge the output
capacitors. Additionally both linear regulators’ reference
inputs are clamped to a voltage proportional to the SS pin
voltage. This method provides a controlled smooth rise in
output voltage.
Fig. 2 shows the soft-start sequence for a typical
application. The internal oscillator’s triangular waveform
is compared to the clamped error amplifier output voltage.
As the SS pin voltage increases, the pulse width on the
PHASE pin increases. The period of increasing pulse
Rev.2.01 6/26/2003


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