参数资料
| 型号： | PQ30RV31J00H |
| 厂商： | Sharp Microelectronics |
| 文件页数： | 4/5页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A TO-220 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.5 V ~ 30 V |
| 输入电压： | 4.5 V ~ 35 V |
| 电压 - 压降（标准）： | 0.3V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 工作温度： | -20°C ~ 80°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-4 |
| 供应商设备封装： | TO-220-4 |
| 包装： | 管件 |
| 其它名称： | 425-2341-5 |
Low Power-Loss Voltage Regulators
Fig.11 Ripple Rejection vs. Input Ripple
Frequency
7
6.5
6
5.5
5
4.5
PQ30RV31
4
V IN =15V,R 1 =390 ? ,R 2 =2.7k ?
– 25
0
25 50 75
100
Dropout voltage V i – O (V)
s
ON/OFF Operation
D 1
V ADJ
D 2
V IN
1
2
V O
R 2
R 2
D 2
C IN
3
4
V ADJ R 1
R 3
+
C O
R L
R 1
R L
V O '
R D
V C
High : Output OFF
Low : Output ON
Equivalent Circuit
in OFF-state
q
q
ON/OFF operation is available by mounting externally D 2 and R 3 .
When V ADJ is forcibly raised above V REF (1.25V TYP)by applying the external signal, the output is turned off(pass transistor
of regulator is turned off. When the output is OFF, V ADJ must be higher then V REF MAX., and at the same time must be lower
than maximum rating 7V.
In OFF-state, the load current flows to R L from V ADJ through R 2 . Therefore the value of R 2 must be as high as possible.
q V O '=V ADJ ? R L /(R L +R 2 )
occurs at the load. OFF-state equivalent circuit R 1 up to 10k ? is allowed. Select as high value of R L and R 2 as possible in this
range. In some case, as output voltage is getting lower(V O <1V), impedance of load resistance rises. In such condition, it is
sometime impossible to obtain the minimum value of V O '. So add the dummy resistance indicated by R D in the figure to the
circuit parallel to the load.
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