UC3845A datasheet(4/16 Pages) STMICROELECTRONICS

Part #	UC3845A

Description	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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UC384XA - UC284XA

4/16

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 : A =

∆VPIN1/∆VPIN3; 0 ≤ VPIN3 ≤ 0.8V

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

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; I

SINK = 1mA

0.7

1.2

0.7

1.2

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

X842A/4A

15

16

17

14.5

16

17.5

V

X843A/5A

7.8

8.4

9.0

7.8

8.4

9.0

V

Min Operating Voltage

After Turn-on

X842A/4A

9

10

11

8.5

10

11.5

V

PWM SECTION

Maximum Duty Cycle

X842A/3A

94

96

100

94

96

100

%

X844A/5A

47

48

50

47

48

50

%

Minimum Duty Cycle

0

%

TOTAL STANDBY CURRENT

Ist

Start-up Current

Vi = 6.5V for UCX843A/

45A

0.3

0.5

0.3

0.5

mA

Vi = 14V for UCX842A/44A

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

3036

V

Table 5. Electrical Characteristcs (continued)

( [note 1] Unless otherwise stated, these specifications apply for -25 < Tamb < 85°C for UC284XA;

0 < Tamb < 70°C for UC384XA; Vi = 15V (note 5); RT = 10K; CT = 3.3nF)

Symbol

Parameter

Test Condition

UC284XA

UC384XA

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

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