参数资料
型号: LM2574N-015
厂商: ON Semiconductor
文件页数: 21/26页
文件大小: 0K
描述: IC REG BUCK 15V 0.5A 8DIP
产品变化通告: Product Discontinuation 27/Jun/2007
标准包装: 50
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 15V
输入电压: 4.75 V ~ 40 V
PWM 型: 电压模式
频率 - 开关: 52kHz
电流 - 输出: 500mA
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
供应商设备封装: 8-PDIP
LM2574, NCV2574
Adjustable Output, Low?Ripple Power Supply
+V in
+V in
LM2574?XX
A 0.5 A output current capability power supply that
features an adjustable output voltage is shown in Figure 35.
5 (12)
This regulator delivers 0.5 A into 1.2 to 35 V output. The
R2
15 k
R3
68 k
C in
22 m F
3
ON/OFF 2
(5) and
4
Gnds (4)
Pins and
(6)
input voltage ranges from roughly 3.0 to 40 V. In order to
achieve a 10 or more times reduction of output ripple, an
additional L?C filter is included in this circuit.
Z1
1N5242
Q1
2N3904
R1
15 k
?V out
NOTE : This picture does not show the complete circuit (see Figure 27).
Figure 34. Undervoltage Lockout Circuit for
Buck?Boost Converter
40 V Max
Unregulated
DC Input
+V in
5
LM2574?ADJ
(12)
(3)
Feedback
1
Output
L1
150 m H
L2
20 m H
Output
Voltage
C in
22 m F
4
Pwr 2
Gnd
(6)
Sig
Gnd
(4)
(14)
3 ON/OFF
7
(5)
D1
1N5819
C out
1000 m F
R2
50 k
R1
C1
100 m F
1.2 to 35 V @ 0.5 A
1.1 k
Optional Output
Ripple Filter
Figure 35. 1.2 to 35 V Adjustable 500 mA Power Supply with Low Output Ripple
http://onsemi.com
21
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