UC2845BD datasheet(4/15 Pages) STMICROELECTRONICS

Part #	UC2845BD

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 V PIN2 =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)

Symbo l

Parameter

T est Cond iti ons

UC284XB

UC384XB

Un it

Min. Typ. Max. Mi n. 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

°CCL = 1nF (2)

50

150

50

150

ns

tf

Fall Time

Tj =25

°CCL = 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

47

48

50

47

48

50

%

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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