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SS6652CNTR 데이터시트(PDF) 1 Page - Silicon Standard Corp.

부품명 SS6652CNTR
상세설명  Micro-Power Inverting DC/DC Controller
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제조업체  SSC [Silicon Standard Corp.]
홈페이지  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

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SS6652
Micro-Power Inverting DC/DC Controller
n FEATURES
l
2.4V to 7V input voltage operation.
l
Adjustable output voltage up to -40V.
l
Low quiescent current at 80
µA.
l
Pulse frequency modulation maintains high
efficiency (87%).
l
70KHz to 160KHz switching frequency.
l
Power-saving shutdown mode (0.7
µA typical).
l
High efficiency with low cost external P-
channel MOSFET or PNP bipolar transistor.
n APPLICATIONS
l
Negative LCD Contrast Bias for
1. Notebook & Palmtop Computers.
2. Pen-Based Data System.
3. Portable Data Collection Terminals.
4. Personal Digital Assistants.
l
Negative Voltage Supply.
n DESCRIPTION
The SS6652 is a high-performance inverting
DC/DC controller, designed to drive an external
power switch to generate programmable negative
voltages, and is particularly suited to LCD bias
contrast applications. Efficiency of 87% can be
achieved with low cost PNP bipolar transistor
drivers. Output voltage can be scaled to -40V or
greater by two external resistors. A pulse fre-
quency modulation scheme is employed to main-
tain high-efficiency conversion over a wide input
voltage range. Quiescent current is about 80
µA
and can be reduced to 0.7
µA in shutdown mode.
With switching frequencies in the 70KHz to
160KHz range, the small size switching compo-
nents are ideal for battery powered portable
equipment, like notebook and palmtop computers.
n TYPICAL APPLICATION CIRCUIT
D1
1N5819
SS6652
CL
DHI
DLOW
FB
GND
SHDN
VIN
VREF
C3
10nF
C4
0.047
µF
150
µH
*L
Q1
9012
RB
470~1.8K
R1
1M
C2
C1
VIN
2.4V ~ 7V
VOUT
-12V~ -40V
-10mA
100
µF
*
Sumida CD-54 Series
VOUT = -1.22V x R1/R2
100
µF
+
+
R2
100K
RCL
Negative LCD Contrast Bias Power Supply
Rev.2.01 6/26/2003


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