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参数资料
| 型号： | LM2575D2TR4-3.3 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封装： | PLASTIC, D2PAK-5 |
| 文件页数： | 11/62页 |
| 文件大小： | 1103K |
| 代理商： | LM2575D2TR4-3.3 |
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LM2575
3–131
MOTOROLA ANALOG IC DEVICE DATA
Figure 26. Inverting Buck–Boost
Regulator with Delayed Startup
D1
1N5819
L1
100
H
Output
2
4
Feedback
Unregulated
DC Input
12 V to 25 V
Cin
100
F
/50 V
1
3
5ON/OFF
Gnd
+Vin
Regulated
Output
–12 V @ 0.35 A
Cout
1800
F
/16 V
LM2575–12
C1
0.1
F
R1
47 k
R2
47 k
It has been already mentioned above, that in some
situations, the delayed startup or the undervoltage lockout
features could be very useful. A delayed startup circuit
applied to a buck–boost converter is shown in Figure 26.
Figure 31 in the “Undervoltage Lockout” section describes an
undervoltage lockout feature for the same converter
topology.
Figure 27. Inverting Buck–Boost Regulator Shut Down
Circuit Using an Optocoupler
LM2575–XX
1
3
5
Gnd
ON/OFF
+Vin
R2
47 k
Cin
100
F
NOTE:
This picture does not show the complete circuit.
R1
47 k
R3
470
Shutdown
Input
MOC8101
–Vout
Off
On
5.0 V
0
+Vin
With the inverting configuration, the use of the ON/OFF pin
requires some level shifting techniques. This is caused by the
fact, that the ground pin of the converter IC is no longer at
ground. Now, the ON/OFF pin threshold voltage (1.4 V
approximately) has to be related to the negative output
voltage level. There are many different possible shut down
methods, two of them are shown in Figures 27 and 28.
Figure 28. Inverting Buck–Boost Regulator Shut Down
Circuit Using a PNP Transistor
NOTE:
This picture does not show the complete circuit.
R2
5.6 k
Q1
2N3906
LM2575–XX
1
3
5
Gnd
ON/OFF
R1
12 k
–Vout
+Vin
Shutdown
Input
Off
On
+V
0
+Vin
Cin
100
F
Negative Boost Regulator
This example is a variation of the buck–boost topology and
is called a negative boost regulator. This regulator
experiences relatively high switch current, especially at low
input voltages. The internal switch current limiting results in
lower output load current capability.
The circuit in Figure 29 shows the negative boost
configuration. The input voltage in this application ranges
from –5.0 V to –12 V and provides a regulated –12 V output.
If the input voltage is greater than –12 V, the output will rise
above –12 V accordingly, but will not damage the regulator.
Figure 29. Negative Boost Regulator
1N5817
150
H
Output
2
4
Feedback
Regulated
Output
Vout = –12 V
Load Current from
200 mA for Vin = –5.2 V
to 500 mA for Vin = –7.0 V
Unregulated
DC Input
–Vin = –5.0 V to –12 V
L1
D1
Cout
1000
F
/16 V
Cin
100
F
/50 V
LM2575–12
1
5
3
ON/OFF
Gnd
+Vin
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| LM2575HVM-12/NOPB | 功能描述:IC REG BUCK 12V 1A 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SIMPLE SWITCHER® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
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