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PDF SCI7661 Data sheet ( Hoja de datos )
| Número de pieza | SCI7661 | |
| Descripción | DC-DC Converter | |
| Fabricantes | Epson | |
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Hay una vista previa y un enlace de descarga de SCI7661 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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PF110-10
SCI7661COA/MOA
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DC-DC Converter
q 95% Typical Power Efficiency
q Doubled or Tripled Output Voltage
q Internal Voltage Regulator
s DESCRIPTION
The SCI7661COA/MOACMOS DC-DC Converter features high operational performance with low power dissipation.
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.
s FEATURES
q High performance with low power dissipation
q Simple conversion of VIN (–5V) to |VIN| (+5V),
2 |VIN| (+10V), 2VIN (–10V) or 3VIN(–15V)
q On-chip output voltage regulator
q Power conversion efficiency–Typ. 95%
q Temperature gradient for LCD power supply – 0.1% / °C, 0.4%/°C or 0.6%/ °C
q Power off by external signals – Stationary current at power off – Max. 2 µA
q Cascade connection–two device connected:
VIN=–5V, VOUT=–20V
q On-chip C'–R oscillator
q Package .................................... SCI7661C0A: DIP-14pin(plastic)
SCI7661M0A: SOP5-14pin(plastic)
s BLOCK DIAGRAM
SCI7661MAA: SSOP2-16pin(plastic)
VDD
OSC1
OSC2
VIN
CAP1–
CAP1+
CAP2–
CAP2+
CR
Oscillator
Voltage
Converter
(I)
Voltage
Converter
(II)
Booster
Regurator
TC1
TC2
Poff
RV
Vreg
Vout
1 page  
SCI7661COA/MOA
0.30
0.25
0.20
0.15
VOUT=
-5V
VOUT=
-10V
0.10
0.05
VOUT=
-15V
0.00
0
5
10 15
20
IOUT(mA)
Fig:13 Regulated Output Saturation
Resistance(RSAT)Vreg—VOUT —IOUT
50
0
-50
-50
0 50
Ta(°C)
CT:
-0.1%/°C
CT:
-0.4%/°C
100
CT:
-0.6%/°C
Fig:14 Output Voltage(vreg)vs.
Temperature(Ta)
s CIRCUIT DESCRIPTION
q C-R Oscillator
The SCI7661C/M contains a C-R oscillator for internal
oscillation. It consists of an external resistor ROSC
connected between the OSC1 pin and OSC2 pin.
Osc1
Osc2
ROSC
C-R Oscillation
Osc1
External Clock
Osc2
Open
External Clock Operation
q Voltage Converters
The voltage converters doubleÅ^triple the input supply voltage (VIN) using clocks generated by the C-R oscillator
VCC
(+5V)
GND
(-5V)
VDD=0V
VIN=-5V
CAP2=2VIN=-10V
Typical Doubled Voltage Relations
VDD=0V
VIN=-5V
VOUT=3VIN=-15V
Typical Tripled Voltage Relations
qReference Voltage Generator and Voltage Regulator
The reference voltage generator produces reference
voltage needed for operation of regulator circuit. The
VDD
voltage regulator is used to regulate a boosted output
voltage and its circuit contains a power-off function which
Poff
RV
Control signal
RRV = 100kΩ to 1MΩ
uses signals from the system for on-off control of the
Vreg output.
Vreg
Voltage Regulator
q Temperature Gradient Selector Circut
The SCI7661C/M provides the Vreg output with a temperature gradient suitable for LCD driving.
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SCI7661.PDF ] | |
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