uct4390

UCT4390 DataSheet V1.0

TEL: 86-755-61353939 (10 ) FAX: 86-755-83454890 www.szuct.com 1 of 11

LED IC UCT4390

UCT4390

LED IC

UCT4390 off-timeMOSFET

MOSFET

LEDLED

UCT4390 off-time2.5MHz

off-timeEN

PWM LED

LED LED20 1 LED

LED 20

1

90%

2.5V~400V DC

10KHz~2.5MHz

LED 1W 30W

PWM LED

UCT4390 – A SOP 8

– B SOT23 6



1

UCT4390A UCT4390B

1 2 VSS

2 3 EN PWM

3 NC

4 GND

5 1 DRV MOSFET

6 6 CS

7 5 TOFF

8 4 VDD

UCT4390



Vmax VDD 8 V

Vmin-max EN CS FB -0.3 ~VDD+0.3 V

Tmin-max -20 ~ 85 oC

Tstorage -40 ~ 165 oC

ESD VESD ESD 2000 V

VDD 2.5 6.5 V

CS VCS 240 250 260 mV

IDD 0.5 1 mA

( off ) TOFF0 620 ns

IDDQ 1 uA

EN VENH 2.0 V

EN VENL 0.8 V

DRV TRISE DRV 500pF 50 ns

DRV DRV 500pF 50 ns


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UCT4390 off-time

UCT4390

TON L

TON L

2.



LED Rcs

2500.5

CSL L

mVR

I I=

+ ∆

UCT4390

50kHz

UCT4390 off-time off-time

2.5MHz

off-time

1000.51 ( 10 )

100OFF

OFF OFFOFF

K RT C pF

R KΩ •= • • +

+ Ω

off-time

0.51 100 10 510OFFT K pF ns= • Ω • =

1 1OFF

DF

T T−= =



UCT4390 TON

2 = IMAX – ILIN

TON VL = Vcc VDP VCS VLED TOFF VL = VLED VF

TON TOFF

LED LED

LED

off-time

L OFFVOUT

TL

I = •∆

OFFL

VOUTL T

I≥ •

∆



50%



5.6

3



3

4

uct4390

Documents

uct4390 uct4390 datasheet

ic uct4390

ns uct4390 datasheet

ns drv

trise drv

vminmax en

vmax vdd

oc esd