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參數資料
| 型號： | PQ1CF2 |
| 廠商： | SHARP ELECTRONICS CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁數： | 8/12頁 |
| 文件大?。?/td> | 93K |
| 代理商： | PQ1CF2 |
Chopper Regulators
PQ1CF2
s Polarity Inversion Type Circuit Diagram (-5V output)
RS
CS
Load
VO=–5V
VIN
5 to 30V
CIN
100
F
CO
2200
F
D R1
1k
R2
3k
+
L
130
H
ON/OFF control
RS<=50k
PQ1CF2
1
2
3
4
5
s Precaution for use
(1)ON/OFF control terminal
ON/OFF control terminal t has ON/OFF function and soft start function. It operates by level of ON/OFF control
terminal voltage. (as shown in fig.1)
<ON/OFF control>
In the following circuit, when ON/OFF control terminal t becomes low by switching transistor Tr on, output voltage
may be turned OFF and the device becomes stand-by mode. Dissipation current at stand-by mode becomes TYP.150
A.
<Soft start>
When capacitor Cs is added on terminal t, voltage of t is gradually getting upper because of internal constant current.
When voltage of t is higher than VTHL output, output pulse starts. And the higher voltage becomes, the wider output
pulse width is. When main power supply turns on, output pulse gradually expands and output voltage will start softly.
Too large capacitance Cs causes long discharging time. In case of input voltage turning time from OFF to ON is short,
soft start function may not operate.
In this case, additional capacitor discharging circuit as shown in Fig.3 can make discharging time short. In order to set
voltage point A is higher than VTHH(3.85V) in ordinary state, please design value of resistor R4, R5 from several k
to
several dozens k
.
<ON/OFF control with soft start up>
For ON/OFF control with capacitor Cs, be careful not to destroy a transistor Tr by discharge current from Cs, adding a
resistor restricting discharge current of Cs.
(V)
3.55
(VTHH)
2.25
(VTHL)
1.4
(VTHON)
0
Stand-by mode
OFF-state
Soft start
time
Duty
0%
Duty
DMAX
Step–down voltage circuit
ON/OFF
terminal
voltage
1
2
3
Fig. 1
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