pq1cz1 ETC-unknow, pq1cz1 Datasheet - Page 7

• Manufacturer Part Number: pq1cz1
• Description: Surface Mount Type Chopper Regulator
• Manufacturer: ETC-unknow

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.
Chopper Regulators
<Soft start>
<ON/OFF control with soft startup>
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 Max.400 A.
When capacitor Cs is attached, output pulse gradually expanded and output voltage will start softly.
For ON/OFF control with capacitor C
resistor restricting discharge current of C
ON/OFF Control Terminal
V
IN
(V
(V
(V
3.55
2.25
THON
1.4
THH
THL
(V)
0
)
)
)
+
C
IN
1
Duty
S
, be careful not to destroy a transistor Tr by discharge current from C
1
4
3
S
.
Duty
C
0%
S
5
2
2
Step Down Voltage Circuit
D
T
MAX
r
3
ON/OFF control signal
D
time
1
2
3
R
R
L
2
1
Stand-by mode
OFF-state
Soft start
I
O
+
C
O
V
O
Load
PQ1CZ1
S
, adding a