FT825 datasheet(6/12 Pages) ETC2

Part #	FT825

Description	Primary-Side Control LED Driver with High PFC

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Fremont Micro Devices

Preliminary FT825

Confidential Rev0.82

DS825-A-page6

ELECTRICAL CHARACTERISTICS

(Tj = 25°C, VCC = 16V, unless otherwise specified)

Symbol

Parameter

Test Condition

Min

Typ

Max

Unit

SUPPLY VOLTAGE

VCC

Operating Range

After turn-on

9.5

20

V

VCCon

Turn-on Threshold

17.8

V

VCCoff

Turn-off Threshold

9.2

V

VCCOVP

VCC over Voltage

24

V

SUPPLY CURRENT

Istart-up

Start-up Current

Before turn-on,VCC= 16V

6

uA

Iq

Quiescent Current

After turn-on, No switch

1.3

mA

Icc

Operating Supply

Current

@ 70 kHz

1.8

mA

MULTIPLIER INPUT

IMULT

Input Bias Current

VMULT = 0 to 3 V

-1

uA

VMULT

Linear Operation

Range

0 to 3

V

△

VCS/△VMULT

Output Max Slope

VMULT = 0 to 1V

VCOMP = Upper clamp

2.4

V/V

K

Gain (1)

VMULT = 1 V, VCOMP = 3 V

0.72

1/V

ERROR AMPLIFIER

VFB

Voltage Feedback

Input Threshold

0.4

V

VEA

Voltage Gain

400

V/V

GEA

Transconductance

100

100uA/V

Source Current

45

uA

ICOMP

Sink Current

-65

uA

Upper Clamp Voltage

5.2

V

VCOMP

Lower Clamp Voltage

1.2

V

CURRENT SENSE COMPARATOR

td (H-L)

Delay to Output

100

ns

VCS clamp

Current Sense

Reference Clamp

2.4

V

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