AN-054E Rev.1.2

Apr.-2011

8

FA5612, FA5613

Fuji Electric Co., Ltd.

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

(3) Electrical Characteristics (Unless otherwise specified, Vfb=2.5V, Vvcmp=2.5V, Vvdet=0V, Vis=0V, Vicmp=2.0V,

Vcc=18V, Rg=4.7kΩ, Tj=25°C)

“+” shows sink and “–“ shows source in current prescription.

Voltage amplifier (FB, VCMP pin)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Voltage feedback input threshold

Vref

Ivcmp = 0uA

2.450

2.500

2.550

V

Line regulation

Regline

Vfb = Vref, Vcc = 10V to 26V

- 12.5

-

12.5

mV

Temperature stability

VrefdT

Vfb = vref, Tj = - 30°C to 150°C

- 0.5

-

0.5

mV/°C

Transconductance

Gmv

Vfb = Vref ± 0.3V

70

90

120

µmho

Ivsrc

Source : Vfb = 1.5V

- 70

- 50

- 30

µA

VCMP output current

Ivsnk

Sink : Vfb = 3.5V

30

50

70

µA

VCMP output H voltage

Vvcmph

Vfb = 1.5V

-

-

5.5

V

VCMP transient response

output current

Iresp

Source : Vfb = 1.5V

- 170

- 140

- 110

µA

VCMP transient response

detection voltage

Vresp

0.902

*Vref

0.940

*Vref

0.978

*Vref

V

Current amplifier (ICMP pin)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Transconductance

Gmc

Vis= - 0.2V to - 0.4V, Vvdet *1

40

60

80

µmho

Icsrc

Source : Vvdet = 3.5V

- 70

- 50

- 30

µA

Output current

Icsnk

Sink : Vis = -2.0V,

30

50

70

µA

ICMP clamp voltage

Vclamp

Vicmp = 3.0V

Iicmp max = 320μA

2.6

2.7

2.9

V

*1 Vvdet is for when Vis = -0.3V, Iicmp = 0µA

Multiplier

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

VDET input bias current

Ivdet

Vvdet = 0V,

- 1.5

-0.5

0

μA

VCMP threshold voltage

Vthvcmp

Vvdet = 2.4V

0.3

0.5

0.7

V

Output voltage coefficient

K

Vvcmp = 1V, Iicmp = 0μA

Vvdet = 0.3V, 1.3V

Vis = 0.1V to -0.2V

0.5

0.70

0.95

-

Oscillator

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Frequency diffusion

(reference frequency)

Fswref

Vvdet = 0.88V, Vis = - 0.18V,

Vvcmp *1, Iicmp = 0µA,

54

60

66

kHz

Frequency

temperature stability

FswrefdT

Vvdet = 0.88V, Vis = - 0.18V,

Vvcmp *1,

Iicmp = 0µA,Tj=-30°C to 125°C

-0.06

-

0.06

kHz/°C

Frequency diffusion

(maximum frequency)

Fswmax

Vvcmp = 0V, Vvdet = 2.4V

64

68

70

kHz

Frequency diffusion,

(minimum frequency)

Fswmin

Vvcmp = 0V, Vvdet = 0V

50

52

55

kHz

Fixed frequency 1

Fsw1

Vout2 < Vout

54

60

66

kHz

Fixed frequency 2

Fsw2

Vout1 < Vout < Vout2

58.5

65

71.5

kHz

Maximum duty cycle

DMAX

Vvdet = 2.4V,

ICMP no connect

91

94

97

%

*1 Vvcmp is for when Vvdet = 0.88V, Vis = -0.18V, Iicmp = 0µA