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| 型號(hào)： | S-8328B50MA-EXE-T2 |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 0.3 A SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO3 |
| 封裝： | PLASTIC, SOT-23, 3 PIN |
| 文件頁(yè)數(shù)： | 22/65頁(yè) |
| 文件大?。?/td> | 759K |
| 代理商： | S-8328B50MA-EXE-T2 |
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SMALL PACKAGE PWM/PFM CONTROL STEP-UP SWITCHING REGULATOR
Rev. 7.2-10
S-8324/8328 Series
Seiko Instruments Inc.
29
t (10
sec/div)
(10mV/div)
0V
-3V
Point A Voltage
(2V/div)
Output Voltage
(c) Ripple Characteristics
Figure 29
When output current IOUT 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 VDD to the IC. Set Vin to 9 V - |VCC | or less.
The output voltage cannot be changed with external resistors.
Set Rb to 60
or more and RE to 6 k or less. The larger RE, the smaller the reactive current through RE and Rb, 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 RE 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-8328E50
-
+
-
+
VOUT
4.7
F/50V×2
EXT
CIN
VIN
to 30V
F93
COUT
CD54/100
H
1k
0.022
F
Rb
VSS
2SD1624T
MA720
SD
L
Cb
VDD
RA
100k
CC
15pF 482k
RB
Figure 30
DISCONTINUED
PRODUCT
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