234
Chopper Regulators
PQ1CZ1
PQ1CZ1
Surface Mount Type Chopper Regulator
s
Features
q
Surface mount type package (equivalent to SC-63, 5-terminal
type)
q
Variable output voltage (1.26V to 35V/1.26V to 30V)
q
Built-in ON/OFF control function
q
Built-in overheat protection function and overcurrent
protection function
s
Applications
q
Personal computers
q
Word processors
q
Printers
q
Car audio equipment
Parameter
Symbol
Rating
Unit
V
IN
V
ADJ
V
i
-
O
I
SW
V
OUT
V
C
P
D
T
j
T
opr
T
stg
T
sol
40
7
41
1.5
1
0.3 to 40
8
150
20 to +80
40 to +150
260(For 10s)
V
V
V
A
V
V
W
C
C
C
C
Input voltage
Error input voltage
Input-output voltage
Switching current
Voltage between output and COM
ON/OFF control voltage
Power dissipation
Junction temperature
Operating temperature
Storage temperature
Soldering temperature
f1
f2
f3
f4
f1
Voltage between V
IN
terminal and COM terminal.
f2
Voltage between V
OUT
terminal and COM terminal.
f3
Voltage between Vc terminal and COM terminal.
f4
With infinite heat sink, Refer to Fig.1
s
Absolute Maximum Ratings
(T
a
=25C)
s
Outline Dimensions
(Unit : mm)
Please refer to the chapter " Handling Precautions ".
1CZ1
6.6MAX
9.7MAX
2.5MIN
5.2
0.5
2.3
0.5
0.5
+0.2
0.1
5.5
0.5
4(1.27)
(0.5)
(0.5)
(0.9)
(1.7)
V
IN
V
OUT
COM(equivalent to heat sink)
O
ADJ
V
C
( ):Typical values
1
1
2
2
3
3
4
4
5
5
3
Notice
In the absence of confirmation by device specification sheets,SHARP takes no responsibility for any defects that may occur in equipment using any SHARP
devices shown in catalogs,data books,etc.Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
Internet Internet address for Electronic Components Group http://www.sharp.co.jp/ecg/
235
Chopper Regulators
PQ1CZ1
Parameter
Symbol
Conditions
V
SAT
V
ref
V
ref
|R
eg
L|
|R
eg
I|
fo
fo
D
MAX
I
L
I
CHG
V
THL
V
THH
V
TH(ON)
I
SD
I
qs
Unit
MAX.
TYP.
MIN.
1.235
80
90
1.55
15
1.95
3.25
1.05
Io=1A, no L,D,C
O
T
j
=0 to 125C
I
O
=0.2 to 1A
V
IN
=8 to 35V
I
O
=1A
T
j
=0 to 125C
terminal = open
No L,D,C
O
, terminals are open
Duty=0%, terminal =OV, terminal
Duty=D
MAX
, terminal is open., terminal
terminal=0V, terminal
V
IN
=40V, terminal =0V
V
IN
=40V, terminal =3V
0.9
1.26
0.5
0.1
0.5
82
100
2
2
10
2.25
3.55
1.4
150
8
1.5
1.285
1.5
2.5
120
2.6
5
2.55
3.85
1.75
400
12
s
Electrical Characteristics
(Unless otherwise specified, condition shall be V
IN
=12V, Io=0.2A, Vo=5V, terminal is open, T
a
=25C)
V
V
%
%
%
%
kHz
%
%
A
A
V
V
A
mA
Output saturation voltage
Reference voltage
Reference voltage temperature fluctuation
Load regulation
Line regulation
Efficiency
Oscillation frequency
Oscillation frequency temperature fluctuation
Maximum duty
Overcurrent detecting level
Charge current
Input threshold voltage
ON threshold voltage
Stand-by current
Output OFF-state consumption current
5
2
4
4
4
4
4
4
5
5
5
5
Fig. 1 Test Circuit
V
IN
I
SD
I
qs
I
CHG
C
IN
100
F
C
O
470
F
D
R
1
1k
R
2
I
O
V
O
+
+
A
A
L
210
H
2.2
n
F
Road
L : HK-HK-14D100-2110(made by Toho Co.)
D : ERC80-004(made by Fuji electronics Co.)
[V
O
]Nearly=1.26 x 1+
V
R
2
R
1
Output voltage
1
2
3
4
5
Fig. 2
Power Dissipation vs. Ambient
Temperature
Note)
Oblique line portion : Overheat protection may operate in this area.
Fig. 3
Overcurrent Protection
Characteristics (Typical Value)
0
0.5
1.5
1
3.5
2.5
3
2
4
5
4
7
6
2
3
1
0
Output voltage Vo (V)
Output current Io
(A)
T
a
=25C
V
IN
=12V
Vo=5V
C
IN
=100
F
Co=470
F
L=210
H
Ambient temperature T
a
(C)
Power dissipation P
D
(W)
P
D
:
With infinite heat sink
20
0
0
5
10
20
40
60
80
100
P
D
236
Chopper Regulators
PQ1CZ1
Fig. 4
Efficiency vs. Input Voltage
Input voltage V
IN
(V)
Efficiency
(%)
0
50
60
70
80
90
100
20
10
30
40
T
j
=25C
V
O
=12V, I
O
=1.0A
V
O
=12V, I
O
=0.2A
V
O
=5V, I
O
=0.2A
V
O
=5V, I
O
=1.0A
Fig. 5
Switching Current vs. Output
Saturation Voltage
T
j
=25C
Output saturation voltage V
sat
(V)
Switching current I
SW
(A)
0
0.5
1.0
1.5
0
0.5
1.0
1.5
2.0
Fig. 6
Stand-by Current vs. Input Voltage
T
j
=25C
Input voltage V
IN
(V)
Stand-by current I
SD
(
A)
0
0
100
50
150
200
10
5
15
25
35
20
30
40
Fig. 7
Reference Voltage Fluctuation vs.
Junction Temperature
25
0
25
50
75
100
125
2
0
1
1
2
Junction temperature T
j
(C)
V
IN
=12V
Vo=5V
Reference voltage fluctuation
V
REF
(%)
Fig. 8
Load Regulation vs. Output Current
0
0.2
0.4
0.6
0.8
1
0.5
1
0.5
0
V
IN
=12V
Vo=5V
C
IN
=100
F
C
O
=470
F
L=210
H
Load regulation R
eg
L
(%)
Output current I
O
(A)
Fig. 9
Line Regulation vs. Input Voltage
0
10
20
30
5
15
25
35
40
0.5
1
0.5
0
Io=0.2A ,Vo=5V
C
IN
=100
F, C
O
=470
F
L=210
H
Line regulation R
eg
I
(%)
Input voltage V
IN
(V)
237
Chopper Regulators
PQ1CZ1
Fig.10 Oscillation Frequency Fluctuation vs.
Junction Temperature
25
0
25
50
75
100
125
5
1
1
3
5
2
0
4
4
2
3
V
IN
=12V
Vo=5V
Junction temperature T
j
(C)
Oscillation frequency fluctuation
f
O
(%)
Fig.11 Overcurrent Detecting Level vs.
Junction Temperature
25
0
25
50
75
100
125
15
5
10
5
15
0
10
Junction temperature T
j
(C)
Overcurrent detecting level
I
L
(%)
Fig.12 Threshold Voltage vs. Junction
Temperature
50
0.5
2
4
3.5
3
2.5
1
1.5
4.5
V
THH
V
THL
V
IN
=12V
V
TH(ON)
25
0
50
25
100
75
125
Junction temperature T
j
(C)
Threshold voltage V
TH(ON),
V
THL,
V
THH
(V)
Fig.13 Operating Consumption Current vs.
Input Voltage
0
5
7
10
9
8
6
10
20
30
40
Io=0.2A
Io=1A
No load
T
j
=25C
Vo=5V
Input voltage V
IN
(V)
Operating consumption current I
q
(mA)
Fig.14 Power Dissipation vs. Ambient
Temperature (Typical Value)
PWB
Material
: Glass-cloth epoxy resin
Size
: 50 X 50 X 1.6mm
Cu thickness : 35
m
PWB
Cu
Cu area 740mm
2
Cu area 180mm
2
Cu area 100mm
2
Cu area 70mm
2
Cu area 36mm
2
Ambient temperature T
a
(C)
Power dissipation P
D
(W)
20
0
0
1
2
3
20
40
60
80
100
238
Chopper Regulators
PQ1CZ1
s
Block Diagram
s
Step Down Type Circuit Diagram (5V output)
s
Polarity Inversion Type Circuit Diagram (5V output)
V
IN
8~35V
C
IN
100
F
Load
C
S
R
S
C
O
470
F
V
O
=5V
R
S
<=50k
ON/OFF control signal
+
D
R
1
1k
R
2
3k
L 210
H
+
PQ1CZ1
1
2
3
4
5
V
IN
5 to 30V
C
IN
100
F
Load
C
S
R
S
C
O
2200
F
V
O
=5V
R
S
<=50k
ON/OFF control signal
+
D
R
1
1k
R
2
3k
L 130
H
+
PQ1CZ1
1
2
3
4
5
Voltage
regulator
ON/OFF
circuit
V
IN
V
OUT
ON/OFF
O
ADJ
COM
Over current
detecting
circuit
Over current
detecting
circuit
F/F
PWM COMP
ERROR AMP.
V
ref
Q
R
S
+
Soft start
Oscillation
+
1
2
3
4
5
239
Chopper Regulators
PQ1CZ1
s
Thermal Protection Design
s
External Connection
+
V
IN
C
IN
C
S
C
O
V
O
R
2
R
1
Load
D
1
2
4
3
5
L
+
q
Wiring condition is very important. Noise associated with wiring inductance may cause problems.
For minimizing inductance, it is recommended to design the thick and short pattern (between large current diodos, input/
output capacitors, and terminal 1,2.)Single-point grounding(as indicated)should be used for best results.
w
When output voltage is not stable, it can be improved by attaching capacitor(from several nF to several dozens nF)to
external resistor R
2
.
e
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
swiching current.
r
The output ripple voltage is highly influenced by ESR(Equivalent Series Resistor)of output capacitor, and can be minimized
by selecting Low ESR capacitor.
t
An inductor should not be operated beyond its maximum rated current so that it may not saturate.
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.) x V
SAT
xD' + V
IN
(voltage between V
IN
to COM terminal) x I
q
'(consumption current)
Step down type
D'(Duty)= =
I
SW
(Average)= I
O
(Output current.)
T
on
T(period)
V
O
+V
F
V
IN
V
SAT
+V
F
Polarity inversion type
D'(Duty)= =
I
SW
(Average)= x I
O
(Output current.)
T
on
T(period)
1
1
D'
|V
O
|+V
F
V
IN
+|V
O
|
V
SAT
+V
F
V
F
: Forward voltage of the diode
240
Chopper Regulators
PQ1CZ1
s
ON/OFF Control Terminal
(V)
3.55
(V
THH
)
2.25
(V
THL
)
1.4
(V
THON
)
0
Stand-by mode
OFF-state
Soft start
time
Duty 0%
Duty D
MAX
Step Down Voltage Circuit
ON/OFF terminal voltage
1
2
3
1
2
3
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.
<Soft start>
When capacitor Cs is attached, output pulse gradually expanded and output voltage will start softly.
<ON/OFF control with soft startup>
For ON/OFF control with capacitor C
S
, be careful not to destroy a transistor Tr by discharge current from C
S
, adding a
resistor restricting discharge current of C
S
.
+
V
IN
C
IN
C
S
C
O
V
O
R
2
R
1
Load
D
1
2
4
3
5
L
I
O
+
T
r
ON/OFF control signal
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.
115
Application Circuits
NOTICE
qThe circuit application examples in this publication are provided to explain representative applications of
SHARP devices and are not intended to guarantee any circuit design or license any intellectual property
rights. SHARP takes no responsibility for any problems related to any intellectual property right of a
third party resulting from the use of SHARP's devices.
qContact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
SHARP reserves the right to make changes in the specifications, characteristics, data, materials,
structure, and other contents described herein at any time without notice in order to improve design or
reliability. Manufacturing locations are also subject to change without notice.
qObserve the following points when using any devices in this publication. SHARP takes no responsibility
for damage caused by improper use of the devices which does not meet the conditions and absolute
maximum ratings to be used specified in the relevant specification sheet nor meet the following
conditions:
(i) The devices in this publication are designed for use in general electronic equipment designs such as:
--- Personal computers
--- Office automation equipment
--- Telecommunication equipment [terminal]
--- Test and measurement equipment
--- Industrial control
--- Audio visual equipment
--- Consumer electronics
(ii)Measures such as fail-safe function and redundant design should be taken to ensure reliability and
safety when SHARP devices are used for or in connection with equipment that requires higher
reliability such as:
--- Transportation control and safety equipment (i.e., aircraft, trains, automobiles, etc.)
--- Traffic signals
--- Gas leakage sensor breakers
--- Alarm equipment
--- Various safety devices, etc.
(iii)SHARP devices shall not be used for or in connection with equipment that requires an extremely
high level of reliability and safety such as:
--- Space applications
--- Telecommunication equipment [trunk lines]
--- Nuclear power control equipment
--- Medical and other life support equipment (e.g., scuba).
qContact a SHARP representative in advance when intending to use SHARP devices for any "specific"
applications other than those recommended by SHARP or when it is unclear which category mentioned
above controls the intended use.
qIf the SHARP devices listed in this publication fall within the scope of strategic products described in the
Foreign Exchange and Foreign Trade Control Law of Japan, it is necessary to obtain approval to export
such SHARP devices.
qThis publication is the proprietary product of SHARP and is copyrighted, with all rights reserved. Under
the copyright laws, no part of this publication may be reproduced or transmitted in any form or by any
means, electronic or mechanical, for any purpose, in whole or in part, without the express written
permission of SHARP. Express written permission is also required before any use of this publication
may be made by a third party.
qContact and consult with a SHARP representative if there are any questions about the contents of this
publication.
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