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| 型號： | S-8327 |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | CMOS PWM-Control Step-Up Switching Regulator(External Transistor)(CMOS PFM（頻率脈沖調(diào)制）控制步升開關(guān)穩(wěn)壓器) |
| 中文描述： | 的CMOS脈寬調(diào)制控制升壓開關(guān)穩(wěn)壓器（外部晶體管）（烤瓷的CMOS（頻率脈沖調(diào)制）控制步升開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 24/65頁 |
| 文件大小： | 569K |
| 代理商： | S-8327 |
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SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Seiko Instruments Inc.
23
When output current I
OUT
exceeds 50 mA, the current capacitance in the external transistor 2SA1362 becomes in short
supply and the IC may be broken. Select a large current capacitance transistor.
The start circuit is not needed because the power supply is supplied from V
DD
to the IC. Set Vin to 9 V - |V
CC
| or less.
The output voltage cannot be changed with external resistors.
Set R
b
to 60
or more and R
E
to 6 k
or less. The larger R
E
, the smaller the reactive current through R
E
and R
b
, allowing the
efficiency to be improved. On the other hand, the switching loss of the Tr becomes large and consequently the efficiency will
be worsened. Select R
E
to ensure high efficiency under operating conditions.
7.
LCD Power Supply (Standard circuit (6))
The following are an application power supply circuit (30V/5mA) for intermidiate and large size LCD, and its characteristics
when 3V (3V
±
10%) and 5V (5V
±
10%) are used for the applied power.
S-8327E50
-
+
-
+
V
OUT
4.7
μ
F/50V
×
2
EXT
C
IN
V
IN
to 30V
F93
C
OUT
CD54/100
μ
H
1k
0.022
μ
F
R
b
V
S
MA720
SD
L
Cb
V
DD
R
A
100k
C
C
15pF
482k
R
B
Figure 27
Figure 26
t (10
μ
sec/div)
10mV/div
0V
-3V
CONT
(2V/div)
Output
Voltage
(c) Ripple Characteristics
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