AN-087E Rev.1.0

April-2011

7

FA5526/5527/5528/5536/5537/5538

Fuji Electric Co., Ltd.

http://www.fujielectric.co.jp/products/semiconductor/

(2) Recommended operating conditions

Item

Symbol

MIN

TYP

MAX

Unit

Supply voltage

10

18

26

V

DC Voltage

80

450

VH pin voltage

AC Line

Voltage

80

288

VH pin series resistor

2.2

47

k ohm

CS pin capacitor

0.01

1

µF

VCC pin capacitor

10

33

µF

(3) Electrical characteristics (Vcc=18V, Tj=25℃, unless otherwise specified)

Oscillator (FB pin)

Item

Symbol

Condition

MIN

TYP

MAX

Unit

FA5526/36

117

130

143

FA5527/37

90

100

110

Oscillating frequency

Fosc

FB=3V

FA5528/38

54

60

66

kHz

Supply voltage stability

Fdv

Vcc = 10 to 26V

-2

2

%

Temperature stability

FdT

Ta = -30 to 85

℃

+0.025

%/

℃

FB pin voltage for starting

frequency variation

VfbM

0.95

1.05

1.15

V

FA5526/36

310

FA5527/37

240

Frequency reduction ratio

kf

⊿f/⊿VFB

at FB pin

=0.8V

to 0.9V

FA5528/38

140

kHz/V

FA5526/36

1.1

FA5527/37

1.1

Oscillating frequency

at light load

F06

FB pin

=0.6V

FA5528/38

1.1

kHz

Minimum frequency *1

Fmin

0.4

1.1

3.0

kHz

*1

The frequency become much smaller than 1.1kHz when intermittent switching occurs at light load near no load.

Pulse width modulator (FB pin)

Item

Symbol

Condition

MIN

TYP

MAX

Unit

Maximum duty cycle

FB pin = 3V, CS pin = 3V

76

80

84

%

Minimum duty cycle

FB pin = 0V, CS pin = 3V

0

%

FB voltage for pulse stop

Duty cycle = 0%

200

280

360

mV

FB pin current

FB pin = 0V

-620

-520

-420

uA