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參數(shù)資料
| 型號(hào)： | 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(shù)： | 12/12頁 |
| 文件大小： | 93K |
| 代理商： | PQ1CF2 |
Chopper Regulators
PQ1CF2
e Output capacitor(Co)
The output ripple voltage is highly influenced by ESR(Equivalent Series Resistor) of output capacitor, and can be
minimized by selecting low ESR capacitor.
Generally, smaller capacitance, lower breakdown voltage of capacitor make ESR of capacitor high. By use of high
grade "low impedance" electrolytic capacitor, output ripple voltage will decrease.
In continuous mode, output ripple voltage and ripple allowance current of capacitor are obtained by the following
equations.
IL= ––––––––––– x D x= ––
<Step down type>
Output ripple voltage (VRIP P–P)=
IL x ESR
(V)
Ripple allowance current (effective value)=
IL
(A)
VIN–VSAT–VO
L
1
fO
r Catch diode
High switching speed and low forward voltage type schottky barrier diode should be recommended for the catch-
diode D because it affects the efficiency. Please select the diode which the current rating is at least 1.2 times greater
than maximum switching current.
t Input capacitor(CIN)
Please select the input capacitor with low ESR and sufficient ripple current rating, wiring as near as possible the
regulator.
In low temperature operating, ESR of capacitor increases, capacitance will greater than usual.
In continuous mode, ripple allowance current of capacitor is obtained by the following equation.
(3) Thermal protection design
Internal power dissipation (P)of device is generally obtained by the following equation.
P=ISW(Average) x VSAT x D + VIN(voltage between VIN to COM terminal) x IQ'(consumption current). . . q
Step down type
D(Duty)= ––––––––– = ––––––––––––
ISW(Average)=IO(Output current)
TON
T(period)
VO+VF
VIN–VSAT+VF
Polarity inversion type
D(Duty)= ––––––––– = –––––––––––––––––
ISW(Average)= ––––– x IO
TON
T(period)
1
1–D
|VO| +VF
VIN+ |VO| –VSAT+VF
IQ' : Consumption current in operating mode
VF : Forward voltage of the diode
––––––––––––––
––––––––––––––––––––
When ambient temperature Ta and maximum power dissipation PD(MAX.)during operation are determined, use a Cu
plate which allows the element to operate within the safety operation area specified by the derating curve. Insufficient
radiation gives an unfavorable influence to the normal operation and reliability of the device.
In the external area of the safety operation area shown by the derating curve, the overheat protection circuit may
operate to shut-down output. However, please avoid keeping such condition for a long time.
Ripple allowance current (effective value)=IO x ––––––––––––––
(A)
VO x (VIN–VO)
VIN
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