参数资料
型号: NCV2575D2T-ADJG
厂商: ON Semiconductor
文件页数: 22/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1A D2PAK-5
产品变化通告: Product Discontinuation 27/Jan/2012
标准包装: 50
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.23 V ~ 37 V
输入电压: 4.75 V ~ 40 V
PWM 型: 电流/电压模式
频率 - 开关: 52kHz
电流 - 输出: 1A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: TO-263-6,D²Pak(5 引线+接片),TO-263BA
包装: 管件
供应商设备封装: D2PAK
LM2575, NCV2575
Adjustable Output, Low ? Ripple Power Supply
+V in
+V in
1
LM2575 ? 5.0
A 1.0 A output current capability power supply that
features an adjustable output voltage is shown in Figure 33.
This regulator delivers 1.0 A into 1.2 V to 35 V output.
R2
15 k
R3
68 k
C in
100 m F 5
ON/OFF 3
GND
The input voltage ranges from roughly 8.0 V 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
1N5242B
Q1
V th ≈ 13 V
2N3904
R1
15 k
V out = -5.0 V
NOTE: This picture does not show the complete circuit.
Figure 32. Undervoltage Lockout Circuit for
Buck ? Boost Converter
Feedback
Unregulated
DC Input
+
C in
100 m F
/50 V
+V in
1
3
LM2575 ? Adj
GND
5
4
Output
2
ON/OFF
L1
150 m H
D1
1N5819
C out
2200 m F
R2
50 k
R1
L2
20 m H
C1
100 m F
Regulated
Output Voltage
1.2 V to 35 V @1.0 A
1.1 k
Optional Output
Ripple Filter
Figure 33. Adjustable Power Supply with Low Ripple Voltage
80
70
Free Air
Mounted
P D(max) for T A = 50 ° C
3.5
3.0
60
50
40
Vertically
Minimum
Size Pad
2.0 oz. Copper
L
L
2.5
2.0
1.5
R q JA
30
1.0
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
Figure 34. D 2 PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
http://onsemi.com
22
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