S-8331 Seiko Instruments USA, S-8331 Datasheet - Page 26

• Manufacturer Part Number: S-8331
• Description: Step-Up Switching Regulator (DC/DC Converter ICs)
• Manufacturer: Seiko Instruments USA

Output Current - Output voltage characteristics (Output Current Increase)
Output Current - Efficiency Characteristics (Output Current Increase)
26
Efficiency
η (%)
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL SWITCHING REGULATOR
S-8330/8331 Series
Output Vol.
VOUT (V)
2. Medium Size LCD Panel Drive Power Supply for PDA
Voltage suitable for smart addressing (SA) and multiple line addressing (A) drive generates from a
3 V- or 5 V-power supply. The following is a circuit example and its characteristics, targeted at positive
voltage of approx. +15 V/500 μA and negative voltage of approx. -9 V/500 μA.
This circuit stablilizes the positive output voltage +VOUT in the S-8330B Series. The negative output
voltage -VOUT is determined and stabilized by the wiring ratio at the second and third sides in the
transducer manufactured by Sumida Corporation (CEE93 6375-002 non-gap type) when the output
current at the positive side is the same as that at the negative side. Also this circuit is targeted at
applications at low load. The use of a 50 kHz product with low switching frequency improves the
efficiency at load of approx. 500 mA.
Set
VOUT=15V
15.4
15.2
15.0
14.8
14.6
90
80
70
60
50
40
0.01
0.01
VIN=2.8V
VIN=3.8V
VIN=5.0V
Figure 19 Medium Size LCD Panel Drive Power Supply for PDA
VIN
0.1
0.1
Output Current I
Output Current I
/10μ
F93
+
−
1
1
OUT
OU T
(mA)
(mA)
VSTRB
VDIN
VCLK
V
10
10
IN
V
Seiko Instruments Inc.
VIN=2.8V
VIN=3.8V
VIN=5.0V
OUT
=+15V
ON/OFF
100
100
S-8330B
Vss
Output Current - Output Voltage Characteristics (Output Current Increase)
Output Vol.
VOUT (V)
CONT
−8.6
−8.8
−9.0
−9.2
−9.4
V
OUT
0.01
CEE93
Sumida/
100μH
1
side
10
st
VIN=2.8V
VIN=3.8V
VIN=5.0V
0.1
MA720
Output Current I
12
3rd
20
2
side
MA720
n d
/10μ
Co-
F93
Co+
/10μ
F93
1
+
−
+
−
OU T
(mA)
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−VOUT
+VOUT
+15V
10
−9V
V
Rev.5.1
OUT
=−9V
100
_00