UCC28600DR datasheet(3/32 Pages) TI1

Part #	UCC28600DR

Description	8-Pin Quasi-Resonant Flyback Green-Mode Controller

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Manufacturer	TI1 [Texas Instruments]

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UCC28600

www.ti.com

SLUS646J

– NOVEMBER 2005 – REVISED JULY 2011

ELECTRICAL CHARACTERISTICS

VDD = 15 V, 0.1-

μF capacitor from VDD to GND, 3.3-nF capacitor from SS to GND charged over 3.5 V, 500-Ω resistor from

OVP to -0.1 V, FB = 4.8 V, STATUS = not connected, 1-nF capacitor from OUT to GND, CS = GND, TA = -40°C to 105°C,

(unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Overall

ISTARTUP

Startup current

VDD = VUVLO -0.3 V

12

25

μA

ISTANDBY

Standby current

VFB = 0 V

350

550

Not switching

2.5

3.5

IDD

Operating current

mA

130 kHz, QR mode

5.0

7.0

VDD clamp

FB = GND, IDD = 10 mA

21

26

32

V

Undervoltage Lockout

VDD(uvlo)

Startup threshold

10.3

13.0

15.3

Stop threshold

6.3

8

9.3

V

ΔVDD(uvlo)

Hysteresis

4.0

5.0

6.0

PWM (Ramp)(1)

DMIN

Minimum duty cycle

VSS = GND, VFB = 2 V

0%

DMAX

Maximum duty cycle

QR mode, fS = max, (open loop)

99%

Oscillator (OSC)

fQR(max)

Maximum QR and DCM frequency

117

130

143

fQR(min)

Minimum QR and FFM frequency

VFB = 1.3 V

32

40

48

kHz

fSS

Soft start frequency

VSS = 2.0 V

32

40

48

dTS/dFB

VCO gain

TS for 1.6 V < VFB < 1.8 V

-38

-30

-22

μs/V

Feedback (FB)

RFB

Feedback pullup resistor

12

20

28

k

Ω

VFB

FB, no load

QR mode

3.30

4.87

6.00

Green-mode ON threshold

VFB threshold

0.3

0.5

0.7

Green-mode OFF threshold

VFB threshold

1.2

1.4

1.6

Green-mode hysteresis

VFB threshold

0.7

0.9

1.1

V

FB threshold burst-ON

VFB during green mode

0.3

0.5

0.7

FB threshold burst-OFF

VFB during green mode

0.5

0.7

0.9

Burst Hysteresis

VFB during green mode

0.13

0.25

0.42

Status

RDS(on)

STATUS on resistance

VSTATUS = 1 V

1.0

2.4

3.8

k

Ω

ISTATUS(leakage)

STATUS leakage/off current

VFB = 0.44 V, VSTATUS = 15 V

-0.1

2.0

μA

(1)

RSCT and CCST are not connected in the circuit for maximum and minimum duty cycle tests, current sense tests and power limit tests.

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