參數(shù)資料
型號(hào)： S-8328
廠商： Seiko Instruments Inc.
英文描述： CMOS PWM/PFM-Control Step-Up Switching Regulator(CMOS PWM/PFM控制步升開(kāi)關(guān)穩(wěn)壓器)
中文描述： 的CMOS PWM / PFM切換，控制升壓型開(kāi)關(guān)穩(wěn)壓器的CMOS（PWM / PFM切換控制步升開(kāi)關(guān)穩(wěn)壓器）
文件頁(yè)數(shù)： 20/68頁(yè)
文件大?。?/td> 647K
代理商： S-8328
SMALL PACKAGE PWM/PFM CONTROL STEP-UP SWITCHING REGULATOR
S-8324/8328 Series
Seiko Instruments Inc.
19
Application Circuits
1.
Backup Circuit
Reduces the backup battery voltage from 3 V to 1.5 V (from 2 cells to 1 cell).
2.
5V/Backup Change
The S-8324A/8328B is provided with a power OFF function, where V
OUT
becomes approx. V
IN
-0.6V. This characteriistic
allows the backup voltage of the microcomputer to be supplied with low current consumption.
3.
Step-down DC/DC converter
The start circuit is not needed because the power supply is supplied from V
DD
to the IC.
The maximum input voltage for V
DD
is 9 V.
DO NOT mount R
A
and R
B
resistors when V
CC
is 2V for S-8324D20MC and 5V for S-8324D50MC.
The external resistor Rb must be 60
or more and R
E
must be 6K
or less. A large value for R
E
raises efficiency due to the
reduction of reactive current for R
E
and R
b
.
Too large value of R
E
lowers efficiency due to the large switching loss of the external transistor (Tr). Choose a suitable value
of R
E
under the operating conditions.
Figure 17
CONT
ON/
OFF
S-8324A
V
OUT
V
SS
-
+
-
+
S-RAM
1.5V
Main Power (5V)
Figure 18
CONT
ON/OFF
S-8324A
V
OUT
V
SS
-
+
-
+
Voltage
Detector
CE
CPU
Figure 19
V
DD
S-8324D
-
C
IN
+
-
+
V
OUT
V
SS
C
OUT
R
E
R
b
CONT
V
IN
V
IN
Tr
V
CC
R
A
R
B
C
C
相關(guān)PDF資料
PDF描述
S-8330 Step-Up Switching Regulator For LCD Bias Supply(用于LCD偏置電源的步升開(kāi)關(guān)穩(wěn)壓器)
S-8331 Step-Up Switching Regulator For LCD Bias Supply(用于LCD偏置電源的步升開(kāi)關(guān)穩(wěn)壓器)
S-8340 PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
S-8340A PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
S-8340B PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
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