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UC3842BN1

High Performance Current Mode Controllers

ON Semiconductor 

UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV

ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 4], 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 5], unless otherwise noted.)

UC284XB

UC384XB, XBV

Characteristics

Symbol Min Typ Max Min Typ Max Unit

ERROR AMPLIFIER SECTION

Voltage Feedback Input (VO = 2.5 V)

Input Bias Current (VFB = 5.0 V)

Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)

Unity Gain Bandwidth (TJ = 25°C)

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

Output Current

Sink (VO = 1.1 V, VFB = 2.7 V)

Source (VO = 5.0 V, VFB = 2.3 V)

Output Voltage Swing

High State (RL = 15 k to ground, VFB = 2.3 V)

Low State (RL = 15 k to Vref, VFB = 2.7 V)

(UC284XB, UC384XB)

(UC384XBV)

VFB

IIB

AVOL

BW

PSRR

ISink

ISource

VOH

VOL

2.45 2.5 2.55 2.42 2.5 2.58 V

– – 0.1 –1.0 – – 0.1 – 2.0 µA

65

90

–

65

90

–

dB

0.7 1.0

–

0.7 1.0

– MHz

60

70

–

60

70

–

dB

mA

2.0 12

–

2.0 12

–

– 0.5 –1.0 – – 0.5 –1.0 –

V

5.0 6.2

–

5.0 6.2

–

–

0.8 1.1

–

0.8 1.1

–

–

–

–

0.8 1.2

CURRENT SENSE SECTION

Current Sense Input Voltage Gain (Notes 6 & 7)

(UC284XB, UC384XB)

(UC384XBV)

AV

V/V

2.85 3.0 3.15 2.85 3.0 3.15

–

–

– 2.85 3.0 3.25

Maximum Current Sense Input Threshold (Note 6)

(UC284XB, UC384XB)

(UC384XBV)

Vth

V

0.9 1.0 1.1 0.9 1.0 1.1

–

–

– 0.85 1.0 1.1

Power Supply Rejection Ratio (VCC = 12 V to 25 V, Note 6)

PSRR

–

70

–

–

70

–

dB

Input Bias Current

IIB

– – 2.0 –10

– – 2.0 –10 µA

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)

High State (ISource = 20 mA) (UC284XB, UC384XB)

(UC384XBV)

(ISource = 200 mA)

V

VOL

–

0.1 0.4

–

0.1 0.4

–

1.6 2.2

–

1.6 2.2

–

–

–

–

1.6 2.3

VOH

13 13.5 –

13 13.5 –

–

–

– 12.9 13.5 –

12 13.4 –

12 13.4 –

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

Vth

V

15

16

17 14.5 16 17.5

7.8 8.4 9.0 7.8 8.4 9.0

Minimum Operating Voltage After Turn–On (VCC)

UCX842B, BV

UCX843B, BV

VCC(min)

V

9.0

10

11

8.5

10 11.5

7.0 7.6 8.2 7.0 7.6 8.2

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

5. 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

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

NCV3843BV: Tlow = –40°C, Thigh = +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and

change control.

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

7. Comparator gain is defined as: AV

∆V Output Compensation

∆V Current Sense Input

http://onsemi.com

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