5962-8670407VXA datasheet(4/15 Pages) TI1

Part #	5962-8670407VXA

Description	QML CLASS V, CURRENT-MODE PWM CONTROLLERS

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Manufacturer	TI1 [Texas Instruments]

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UC1842A-SP, UC1843A-SP, UC1844A-SP, UC1845A-SP

SLUS872A – JANUARY 2009 – REVISED MAY 2009........................................................................................................................................................ www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

VCC = 15 V, RT = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Error Amp Section

Input voltage

VComp = 2.5 V

2.45

2.50

2.55

mV

Input bias current

–0.3

–1

µA

Open-loop voltage gain

VO = 2 V to 4 V

65

90

dB

Unity-gain bandwidth

TJ = 25°C

(6)

0.7

1

MHz

PSRR

VCC = 12 V to 25 V

60

70

dB

Output sink current

VFB = 2.7 V, VComp = 1.1 V

2

6

mA

Output source current

VFB = 2.3 V, VComp = 5 V

–0.5

–0.8

mA

High-level output voltage

VFB = 2.3 V, RL = 15 kΩ to ground

5

6

V

Low-level output voltage

VFB = 2.7 V, RL = 15 kΩ to VREF

0.7

1.1

V

Current Sense Section

Gain(7)(8)

2.85

3

3.15

V/V

Maximum input signal

VComp = 5 V

(7)

0.9

1

1.1

V

PSRR

VCC = 12 V to 25 V

(7)

70

dB

Input bias current

–2

–10

µA

Delay to output

VISENSE = 0 to 2 V

(6)

150

300

ns

Output Section

ISINK = 20 mA

0.1

0.4

V

Output low-level voltage

ISINK = 200 mA

1.5

2.2

V

ISOURCE = –20 mA

13

13.5

V

Output high-level voltage

ISOURCE = –200 mA

12

13.5

V

Rise time

CL = 1 nF, TJ = 25°C

(6)

50

150

ns

Fall time

CL = 1 nF, TJ = 25°C

(6)

50

150

ns

UVLO saturation

VCC = 5 V, ISINK = 10 mA

0.7

1.2

V

Undervoltage Lockout Section

UC1842A, UC1844A

15

16

17

Start threshold

V

UC1843A, UC1845A

7.8

8.4

9

UC1842A, UC1844A

9

10

11

Minimum operation voltage after turn-on

V

UC1843A, UC1845A

7

7.6

8.2

PWM Section

UC1842A, UC1843A

94

96

100

Maximum duty cycle

%

UC1844A, UC1845A

47

48

50

Minimum duty cycle

0

%

Total Standby Current

Start-up current

0.3

0.5

mA

Operating supply current

VFB = VISENSE = 0 V

11

17

mA

VCC zener voltage

ICC = 25 mA

30

34

V

(6)

Parameters ensured by design and/or characterization, if not production tested.

(7)

Parameter measured at trip point of latch with VFB = 0 V.

(8)

Gain defined as: G =

ΔVComp/ΔVISENSE; VISENSE = 0 to 0.8 V.

4

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Product Folder Link(s): UC1842A-SP UC1843A-SP UC1844A-SP UC1845A-SP

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