UC3844BD1013TR datasheet(4/15 Pages) STMICROELECTRONICS

Part #	UC3844BD1013TR

Description	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Notes :

1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain Tj as

close to Tamb as possible.

2. These parameters, although guaranteed, are not 100% tested in production.

3. Parameter measured at trip point of latch with VPIN2 = 0.

4. Gain defined as :

∆ VPIN1

A =

; 0

≤ VPIN3 ≤ 0.8 V

∆ VPIN3

5. Adjust Vi above the start threshold before setting at 15 V.

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Conditions

UC284XB

UC384XB

Unit

Min. Typ. Max. Min. Typ. Max.

OUTPUT SECTION

VOL

Output Low Level

ISINK = 20mA

0.1

0.4

0.1

0.4

V

ISINK = 200mA

1.6

2.2

1.6

2.2

V

VOH

Output High Level

ISOURCE = 20mA

13

13.5

13

13.5

V

ISOURCE = 200mA

12

13.5

12

13.5

V

VOLS

UVLO Saturation

VCC = 6V; ISINK = 1mA

0.1

1.1

0.1

1.1

V

tr

Rise Time

Tj = 25

°C CL = 1nF (2)

50

150

50

150

ns

tf

Fall Time

Tj = 25

°C CL = 1nF (2)

50

150

50

150

ns

UNDER-VOLTAGE LOCKOUT SECTION

Start Threshold

X842B/4B

15

16

17

14.5

16

17.5

V

X843B/5B

7.8

8.4

9.0

7.8

8.4

9.0

V

Min Operating Voltage

After Turn-on

X842B/4B

9

10

11

8.5

10

11.5

V

X843B/5B

7.0

7.6

8.2

7.0

7.6

8.2

V

PWM SECTION

Maximum Duty Cycle

X842B/3B

94

96

100

94

96

100

%

X844B/5B

4748

5047

4850

%

Minimum Duty Cycle

0

%

TOTAL STANDBY CURRENT

Ist

Start-up Current

Vi = 6.5V for UCX843B/45B

0.3

0.5

0.3

0.5

mA

Vi = 14V for UCX842B/44B

0.3

0.5

0.3

0.5

mA

Ii

Operating Supply Current

VPIN2 = VPIN3 = 0V

12

17

12

17

mA

Viz

Zener Voltage

Ii = 25mA

30

36

30

36

V

UC2842B/3B/4B/5B - UC3842B/3B/4B/5B

4/15

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