SCI7661 EPSON Electronics, SCI7661 Datasheet

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SCI7661

Manufacturer Part Number
SCI7661
Description
SCI7661DC-DC Converter
Manufacturer
EPSON Electronics
Datasheet

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The SCI7661C
It consists of two major parts: the booster circuitry and the regulator circuitry. The booster generates a doubled
output voltage (–2.4 to –12V) or tripled output voltage (–3.6 to –18V) from the input (–1.2 to –6V). The regulator is
capable of setting the output to any desired voltage. The regulated voltage can be given one of the three threshold
temperature gradients.
DESCRIPTION
FEATURES
BLOCK DIAGRAM
High performance with low power dissipation
Simple conversion of V
On-chip output voltage regulator
Power conversion efficiency–Typ. 95%
Temperature gradient for LCD power supply – 0.1% / C, 0.4%/ C or 0.6%/ C
Power off by external signals – Stationary current at power off – Max. 2 A
Cascade connection–two device connected:
On-chip C'–R oscillator
Package .................................... SCI7661C
2 |V
V
IN
=–5V, V
IN
| (+10V), 2V
OUT
OA
/M
=–20V
OA
IN
CMOS DC-DC Converter features high operational performance with low power dissipation.
CAP1+
CAP2+
CAP1–
CAP2–
(–10V) or 3V
OSC1
OSC2
IN
V
V
DD
IN
(–5V) to |V
SCI7661M
SCI7661M
IN
Oscillator
Converter
Converter
Voltage
Booster
Voltage
CR
(–15V)
IN
(I)
(II)
| (+5V),
0A
0A
AA
: DIP-14pin (plastic)
: SOP5-14pin (plastic)
: SSOP2-16pin (plastic)
SCI7661C
Regurator
95% Typical Power Efficiency
Doubled or Tripled Output Voltage
Internal Voltage Regulator
DC-DC Converter
TC1
TC2
P
RV
V
V
off
reg
out
OA
/M
PF110-10
OA

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SCI7661 Summary of contents

Page 1

... Temperature gradient for LCD power supply – 0. 0.4 0.6%/ C Power off by external signals – Stationary current at power off – Max Cascade connection–two device connected: V =–5V, V =–20V IN OUT On-chip C'–R oscillator Package .................................... SCI7661C BLOCK DIAGRAM V DD OSC1 OSC2 V IN CAP1– ...

Page 2

... OUT Iopr 60 100 1 Iopr osc R 150 200 OUT Peff reg 0.2 •V OUT reg SCI7661C OA Function (V Max. Unit Remark = Doubler 0 Tripler OSC1, P 0.5 V TC1, TC2 300 Plastic package 150 0V, V =-5V, Ta=- ...

Page 3

... R Min. depends on input voltage as shown below. L 1.2V ~ 2.2V OSC =1mA 0.6v F SCI7661C /M OA Condition V =-15V, V =-8V, OUT reg Ta=25 C 0<I <10mA, TC1=V OUT DD TC2=V OUT R =D(Vreg—V )/DI SAT OUT OUT 0<I <10mA, RV=V , OUT DD Ta=25 C TC2=V , TC1=V , Ta=25 C OUT ...

Page 4

... IN Output Current(I ) OUT -8.000 V =-15V OUT Ta=25 C -7.950 -7.900 -7.850 (A) OUT Fig.11 Output Voltage(V )vs. Output reg Current(I ) OUT SCI7661C /M OA 150 Ta= =40kHz OSC 100 f =20kHz OSC 50 =10kHz f OSC (V) IN Fig.3 Input Voltage(V )vs. Booster ...

Page 5

... SAT reg OUT OUT CIRCUIT DESCRIPTION C-R Oscillator The SCI7661C/M contains a C-R oscillator for internal oscillation. It consists of an external resistor R connected between the OSC1 pin and OSC2 pin. Voltage Converters The voltage converters doubleÅ^triple the input supply voltage ( ...

Page 6

... In parallely connection, a regulated output can be obtained by applying the regulation circuit to only one of the n parallely connected circuit. Cascade Connection Cascade connection of SCI7661C/M (by connecting V the next stage) further increase the output voltage. Note, however, that the serial connection increases the output impedance ...

Page 7

... Changing the Temperature Gradient through Use of External Temperature Sensor (Thermistor) The SCI7661C/M has a temperature gradient selector circuit in its regulator. It selects any one of the three gradients: –0. –0. and –0. necessary that the temperature gradient can be changed to any other value by connecting a thermistor in series to the ...

Page 8

... Plastic SOP5-14pin 8 10.5 max ( 0.413 ) max 10.2 0.2 +0.007 ( ) 0.402 –0.008 14 8 INDEX 1 7 0.4 0.1 1.27 0.1 +0.003 ( ) ( ) 0.05 0.003 0.016 –0.004 SCI7661C / 0.15 0.1 +0.003 ( 0.006 ) –0.004 0.4 ( 0.016 ) 1. 0.049 Unit: mm (inch) ...

Page 9

... Fax: +81-(0)42-587-5624 ED International Marketing Department I (Europe & U.S.A.) 421-8, Hino, Hino-shi, Tokyo 191-8501, JAPAN Phone: +81-(0)42-587-5812 Fax: +81-(0)42-587-5564 ED International Marketing Department II 421-8, Hino, Hino-shi, Tokyo 191-8501, JAPAN Phone: +81-(0)42-587-5814 Fax: +81-(0)42-587-5110 Electric Device Information of EPSON WWW server http://www.epson.co.jp (Asia) SCI7661C / ...

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