UC2843BDR2G datasheet(4/25 Pages) ONSEMI

Part #	UC2843BDR2G

Description	High Performance Current Mode Controllers

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Manufacturer	ONSEMI [ON Semiconductor]

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UC3842B, UC3843B, UC2842B, UC2843B

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ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 7], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values

TA is the operating ambient temperature range that applies [Note 8], unless otherwise noted.)

UC284XB, UC2843D

UC384XB, XBV

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

CURRENT SENSE SECTION

Current Sense Input Voltage Gain (Notes 5 and 6)

UC2843D, UC284XB, UC384XB

UC384XBV

AV

2.85

−

3.0

−

3.15

−

2.85

3.0

3.15

3.25

V/V

Maximum Current Sense Input Threshold (Note 5)

UC2843D, UC284XB, UC384XB

UC384XBV

Vth

0.9

−

1.0

−

1.1

−

0.9

0.85

1.0

1.1

V

Power Supply Rejection Ratio (VCC = 12 V to 25 V, Note 5)

PSRR

−

70

−

70

−

dB

Input Bias Current

IIB

−

−2.0

−10

−

−2.0

−10

mA

Propagation Delay (Current Sense Input to Output)

tPLH(In/Out)

−

150

300

−

150

300

ns

OUTPUT SECTION

Output Voltage

Low State (ISink = 20 mA)

(ISink = 200 mA)

UC284XB, UC384XB

UC384XBV, UC2843D

High State (ISource = 20 mA)

UC284XB, UC384XB

UC384XBV, UC2843D

(ISource = 200 mA)

VOL

VOH

−

13

−

12

0.1

1.6

−

13.5

−

13.4

0.4

2.2

−

13

12.9

12

0.1

1.6

13.5

13.4

0.4

2.2

2.3

−

V

Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA)

VOL(UVLO)

−

0.1

1.1

−

0.1

1.1

V

Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)

tr

−

50

150

−

50

150

ns

Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)

tf

−

50

150

−

50

150

ns

UNDERVOLTAGE LOCKOUT SECTION

Startup Threshold (VCC)

UCX842B, BV

UCX843B, BV, D

Vth

15

7.8

16

8.4

17

9.0

14.5

7.8

16

8.4

17.5

9.0

V

Minimum Operating Voltage After Turn−On (VCC)

UCX842B, BV

UCX843B, BV, D

VCC(min)

9.0

7.0

10

7.6

11

8.2

8.5

7.0

10

7.6

11.5

8.2

V

PWM SECTION

Duty Cycle

Maximum UC284XB, UC384XB, UC2843D

Maximum UC384XBV

Minimum

DC(max)

DC(min)

94

−

96

−

0

94

93

−

96

−

0

%

TOTAL DEVICE

Power Supply Current

Startup (VCC = 6.5 V for UCX843B, UC2843D

Startup VCC 14 V for UCX842B, BV)

(Note 7)

ICC + IC

−

0.3

12

0.5

17

−

0.3

12

0.5

17

mA

Power Supply Zener Voltage (ICC = 25 mA)

VZ

30

36

−

30

36

−

V

5. This parameter is measured at the latch trip point with VFB = 0 V.

6. Comparator gain is defined as: AV DV Output Compensation

DV Current Sense Input

7. Adjust VCC above the Startup threshold before setting to 15 V.

8. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

Tlow = 0°C for UC3842B, UC3843B; −25°C for UC2842B, UC2843B; −40°C for UC3842BV, UC3843BV, UC2843D

Thigh = +70°C for UC3842B, UC3843B; +85°C for UC2842B, UC2843B, UC2843D; +105°C for UC3842BV, UC3843BV

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