Boot Strap System Chopper Regulator
Under
Development
High efficiency:TYP 87 %
(Compare to conventional model:5 % up)
Low dissipation current :I
QS
=MAX 7mA
(Compare to conventional model:56% down)
Compact package:SOP8 -pin(Outline dimension:5.2 6.21.5 mm)
Compare to SC -63 package (Mounting area):49 % down
Compare to TO -263 package (Mounting area):77 % down
Features
Features
Expansion of Chopper Regulator
Expansion of Chopper Regulator
Specifications
Specifications
Outline Dimensions
Outline Dimensions
Line-up of Chopper Regulator
Line-up of Chopper Regulator
1
2
3
4
5
[PQ1CX12H2ZP]
Parameter
Symbol Characteristics
Conditions
Input voltage
V
IN
MAX 20 V
Output saturation voltage
V
SAT
TYP 0.3 V
I
SW
=2.0 A
Switching current
I
SW
MAX 2.5 A
Output OFF -state dissipation current
I
QS
MAX 7 mA
Stand -by current
I
SD
MAX 400
A
Reference voltage
V
ref
TYP 1.26 V
Oscillation frequency
f
OSC
TYP 150 kHz
Efficiency
TYP 87%
Operating temperature
T
opr
-30 to +85
C
V
IN
=12V,V
O
=5V,I
O
=2A
V
IN
=20 V
V
IN
=20 V
5.2
4.4
1.5
6.2
Unit:mm
S mark
1.25
V
IN
V
B
NC
ON/OFF
V
adj
COM
COM
V
O
Step down output
/ Reverse output
TO-220
3.5A
70kHz
PQ1CG2032FZ/RZ
TO-263
3.5A
150kHz
PQ1CY1032ZP/ZZ
SC-63
0.8A
300kHz
Package SW current Oscillation frequency
300kHz
PQ1CG38M2FZ/RZ
150kHz
PQ1CG3032FZ/RZ
1.5A
100kHz
PQ1CG21H2FZ/RZ
0.8A
100kHz
PQ1CZ21H2ZP/ZZ
1.5A
PQ1CZ38M2ZP/ZZ
300kHz
PQ1CG41H2FZ/RZ
300kHz
PQ1CZ41H2ZP/ZZ
SOP8 -pin
2.5A
150kHz
PQ1CX12H2ZP
PQ1CX12H2ZP
TYP 87% (12V
5V,2A)
TYP 82% (12V
5V,2A)
Efficiency
Boot strap system
General purpose type
System
SOP8 -pin
TO-263type 5 -pin
Package
5.2
6.21.5 mm
10.6
13.73.5 mm
Outline dimension
PQ1CX12H2ZP
PQ1CY1032ZP/ZZ
Model No.
4.5 to 40 V
3.5 A
TYP 75% (5V
3.3V,2A)
4.5 to 20 V
Input voltage
2.5 A
SW current(MAX)
TYP 85% (5V
3.3V,2A)
TYP 87% (12V
5V,2A)
TYP 82% (12V
5V,2A)
Efficiency
Boot strap system
General purpose type
System
SOP8 -pin
TO-263type 5 -pin
Package
5.2
6.21.5 mm
10.6
13.73.5 mm
Outline dimension
PQ1CX12H2ZP
PQ1CY1032ZP/ZZ
Model No.
4.5 to 40 V
3.5 A
TYP 75% (5V
3.3V,2A)
4.5 to 20 V
Input voltage
2.5 A
SW current(MAX)
TYP 85% (5V
3.3V,2A)
High efficiency
Compact package
6
7
8
1
2
3
4
5
6
7
8
Block Diagram
ON/OFF
circuit
Voltage
regulator
Soft
Start
-
+
Oscill
ator
fo Conversion
circuit
Q
R
S
+
-
Over
Heat
Detection
circuit
Over
current
detection
circuit
Drive
Circuit
F/F
Comparator
AMP
V
ref
V
IN
V
B
Vo
ON/OFF
Oadj
COM
Application Circuit
V
IN
GND
GND
V
OUT
C
IN
C
O
D
L
R1
R2
V
C
(ON/OFF)
Chopper
regulator
Boot strap
condenser
V
IN
=5V
Vo=3.3V
Io=2A
Vo
V
B
Oadj
COM
High Efficiency 82% against conventional model
---> The method 87%(at V
IN
=12V-
Vo=5V)
V
CE
V
BE
V
IN
V
CE
driver
V
IN
Conventional (general purpose)
Bootstrap method
Driver power supply and output transistor
current are supplied from the same power
supply.
Driver power and output transistor current is
supplied from the separate power supply
Output salutation voltage:
Large (VBE +VCE = over 1V)
Output saturation voltage small
(V
CE
=0.3)
V
O
Supply from same voltage
as input voltage
To supply from higher voltage than
input voltage Charged to bootstrap capacitor
Output salutation voltage:
Large : over 1V
Output saturation voltage Low : 0.3
C
driver
Bootstrap capacitor is installed to supply higher controlled vol tage than input voltage to
switching transistor inside.
The higher efficiency is obtained due to the switching transisto r's saturated voltage become
low by higher controlled voltage than supplied input voltage
Reduction of
switching loss
High efficiency
Feature of Bootstrap Method Chopper Regulator
Efficiency improvement at low input
Conventional efficiency 75%-
85% (V
IN
=5V
VO =3.3V)
Drastic improvement of efficiency esp in dropper application below 5V
V
O
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