Chopper Regulators

PQ2CF1

Fig. 1 Test Circuit

Fig. 2 Power Dissipation vs. Ambient

Temperature

Parameter

Symbol

Conditions

Unit

MAX.

TYP.

MIN.

––

1.235

––

––

––

––

40

––

90

2.7

–80

–150

0.55

1.65

0.3

0.1

––

––

0.6

1.26

±0.5

0.1

0.2

85

50

±5

––

4.4

–50

–100

0.75

1.85

0.45

0.2

270

4.0

1.2

1.285

––

1.5

1.5

––

60

––

––

5.8

–20

–50

0.95

2.05

0.6

0.3

400

12

η

fo

V

V

%

%

%

%

kHz

%

%

A

µA

µA

V

V

V

V

µA

mA

––

˚C

––

˚C

terminal is open

Duty=50%,

terminal=0V,

terminal

terminal=0.5V,

terminal

Duty=0%,

terminal

terminal is open,

terminal=1.1V

terminal is open,

terminal=1.4V

terminal is open,

terminal

terminal=0.5V,No L,

Output saturation voltage

Reference voltage

Reference voltage temperature fluctuation

Load regulation

Line regulation

Efficiency

Oscillation frequency

Oscillation frequency temperature fluctuation

Maximum duty

Over current detecting level

Charge current 1

Charge current 2

Input threshold voltage

Vc terminal low level voltage

Vc terminal high level voltage

On threshold voltage

Stand-by current

Output OFF-state dissipation current

5

5

5

4

4

4

4

1

1

1

4

4

4

4

;;

;;

;;

;;

20

0

5

10

15

–20

0

20

40

60

100

80

100

µF

0.047

µF

470

µF

1k

Ω

+

+

A

L

90

µH

L : HK-12S100-9000 (made by Toho Co.)

D : ERC80-004 (made by Fuji electronics Co.)

D

PQ2CF1

1k

Ω

2

1

4

3

3

Vsw

+

–

+

F/F

Q

R

S

Voltage

regulator

circuit

COMP.

COM

ON/OFF

circuit

Soft start

Oscillator

Low voltage

malfunction

prevention circuit

Overcurrent

protection

circuit

Overheat

protection

circuit

Error amp.

Amp.

5

1

3

4

2

Note) Oblique line portion : Overheat protection may operate in this area.