UC3837 datasheet(5/11 Pages) UTC

No de pièce	UC3837

Description	LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

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Fabricant	UTC [Unisonic Technologies]

Site Internet	http://www.utc-ic.com

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UC3837

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

5 of 11

www.unisonic.com.tw

QW-R103-069.A



ELECTRICAL CHARACTERISTICS (TA=25°C, VDD=16V，unless otherwise specified)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY SECTION

Start Up Current

ISTR

VDD = VDD(ON)-0.1V

5

20

μA

IC Operating current

IOP

VFB=3.5V

3.2

5

mA

VDD Zener Clamp Voltage

VCLAMP

IDD=10mA

23

24.6

26

mA

UNDER-VOLTAGE LOCKOUT SECTION

Start Threshold Voltage

VTHD(ON)

13

14.5

15.5

V

Min. Operating Voltage

VDD(MIN)

7.5

8.5

9.5

V

Hysteresis

VDD(HY)

5.4

V

CONTROL SECTION

VFB Open Loop Voltage Level

VFB-OPEN

5

V

PWM Input Gain

AVCS

∆VFB/∆VCS

3

V/V

Burst-Mode Out FB Voltage

VFB(OUT)

VSENSE =0

1.1

V

Reduce-Frequency end FB Voltage

VFB(END)

VSENSE =0

1.8

V

Burst-Mode Enter FB Voltage

VFB(IN)

VSENSE =0

0.9

V

Switch Frequency

Normal

FSW

VFB=3.5V, hopping Rang

55

65

75

KHz

Power-Saving

Before enter burst mode

20

22

25

KHz

Duty Cycle

DMAX

VFB=3.5V, VSENSE=0

75

%

Frequency Hopping

FJ(SW)

-4

+4

%

Frequency VDD Stability

FDV

VDD=12V~20V

5

%

Frequency Temperature Stability

FDT

T=-20~100°C

1.5

5

%

Feedback Resistor

RFB

11

KΩ

PROTECTION SECTION

VCC Over Voltage Protection Threshold

VOVP

VFB=4.2V

26

V

FB PIN Over Load Protection Threshold

VOLP

4.4

4.7

5.0

V

Over Load Protection Delay-Time

TDelay

55

mS

Soft start time

TSS

4

mS

CURRENT LIMITING SECTION

Peak Current Threshold Voltage

VCS

VFB=3.5V, Duty=0%

0.6

0.65

0.7

V

Lead Edge Blanking Time

TLEB

400

ns

DRIVER OUTPUT SECTION

Output Voltage Low State

VOL

VDD=16V,IO=-20mA

0.8

V

Output Voltage High State

VOH

VDD=16V,IO= 20mA

10

V

Output Voltage Rise Time

tR

CL=1.0nF

100

ns

Output Voltage Fall Time

tF

CL=1.0nF

60

ns

BNO SECTION

Threshold voltage for BNO

VTH_BNO

0.95

1.0

1.05

V

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