Boot Strap System Chopper Regulator

Under

Development

• High efficiency:TYP 87 %

(Compare to conventional model:5 % up)

(Compare to conventional model:56% down)

• Compact package:SOP8 -pin(Outline dimension:5.2 ×6.2×1.5 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

MAX 20 V

Output saturation voltage

TYP 0.3 V

Switching current

MAX 2.5 A

Output OFF -state dissipation current

MAX 7 mA

Stand -by current

MAX 400

µA

Reference voltage

TYP 1.26 V

Oscillation frequency

TYP 150 kHz

Efficiency

η

TYP 87%

Operating temperature

-30 to +85

°C

5.2

Unit:mm

S mark

1.25

NC

ON/OFF

COM

COM

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

×6.2×1.5 mm

10.6

×13.7×3.5 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

×6.2×1.5 mm

10.6

×13.7×3.5 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

Vo

ON/OFF

Oadj

COM

■

Application Circuit

GND

GND

D

L

R1

R2

(ON/OFF)

Chopper

regulator

Boot strap

condenser

Vo=3.3V

Io=2A

Vo

Oadj

COM

・

High Efficiency 82% against conventional model

driver

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

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 : 0.3Ｖ

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%-

VO =3.3V)

Drastic improvement of efficiencyesp in dropper application below 5V