pq1cz21h2z Sharp Microelectronics of the Americas, pq1cz21h2z Datasheet - Page 7

• Manufacturer Part Number: pq1cz21h2z
• Description: Dissipation Current Off-state Chopper Regulator
• Manufacturer: Sharp Microelectronics of the Americas

When ambient temperature Ta and power dissipation P
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.
1. In the following circuit,when ON/OFF control terminal
2. ON/OFF control terminal
OFF and the device becomes stand-by mode. Dissipation current at stand-by mode becomes Max.1 A.
(RCA4000 series). If ON/OFF control terminal is not used, it is recommended to directly connect applicable terminals with input
terminal.
Thermal Protection Design
ON/OFF Control Terminal
V
IN
Internal power dissipation(P)of device is generally obtained by the following equation.
––––––––––––––
––––––––––––––––––––
P=I
Step down type
Polarity inversion type
SW
(Average.) V
D'(Duty)= –––––––– = –––––––––––––
I
D'(Duty)= –––––––– = ––––––––––––––––––––
I
SW
SW
(Average)= I
(Average)= –––––––– I
5
C
IN
1
is compatible with LS-TTL. It enables to be directly drive by TTL or C-MOS standard logic
T(period)
T(period)
PQ1CZ21H2Z
SAT
T
T
O
on
on
(Output current.)
D' + V
1–D'
4
3
1
IN
V
(voltage between V
C-MOS or TTL
IN–
V
V
O
2
IN
V
5
(Output current.)
O
D
5
+|V
+V
SAT
(MAX)during operation are determined, use Cu plate which allows the
becomes low by switching transistor T
|V
F
+V
O
O
|–V
|+V
F
SAT
F
+V
V
F
F
: Forward voltage of the diode
IN
to COM terminal) I
D
L
R
R
2
1
Q
r
on, output voltage may be turned
'(consumption current)
C
O
I
O
PQ1CZ21H2Z
V
O
Load