參數(shù)資料
型號(hào): PQ1CY1032Z_1
廠商: Sharp Corporation
英文描述: TO-263 Surface Mount Type Chopper Regulator
中文描述: TO - 263表面安裝型斬波調(diào)壓
文件頁數(shù): 7/9頁
文件大小: 86K
代理商: PQ1CY1032Z_1
PQ1CY1032Z
I
ON/OFF Control Terminal
1. In the following circuit,when V
soft
terminal becomes low (loss than V
THON
) 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 Max.400
μ
A.
When transistor Tr becomes OFF, output voltage can be ON.
External resistor Rs should be leaded to avold discharge current of C
S
, and not to break the transistor Tr.
2. Soft startup
When capacitor C
S
is loaded, output pulse gradually expanded and output voltage will start softly.
3. Over current protection
When the voltage of V
soft
is more than V
THIL
, over current shut down function will operate. And when the voltage of V
soft
is
less than V
THIL
, over current protection function will operate. Since the
PQ1CY1032Z
must use an capacitor C
S
, V
soft
should be
more than V
THIL
, over current shut down function will operate.
1
2
L
D
5
3
4
PQ1CY1032Z
R
1
R
2
V
O
I
O
C
O
C
IN
C
S
Tr
R
S
V
IN
+
+
ON/OFF control signal
Load
5
5
5
5
I
Thermal Protection Design
Internal power dissipation(P)of device is generally obtained by the following equation.
When ambient temperature Ta and power dissipation P
D
(MAX)during operation are determined, use 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.
P=I
SW
(Average.)
×
V
SAT
×
D' + V
IN
(voltage between V
IN
to COM terminal)
×
I
Q
'(consumption current)
Step down type
––––––––––––––
D'(Duty)= T(T
I
SW
(Average)= I
O
(Output current.)
on
V
O
+V
F
V
IN
V
SAT
+V
F
Polarity inversion type
––––––––––––––––––––
D'(Duty)= T(T
D'
I
SW
(Average)= ––1
×
I
O
(Output current.)
on
|V
O
|+V
F
V
IN
+|V
O
|
V
SAT
+V
F
V
F
: Forward voltage of the diode
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