SLUS208 datasheet(2/11 Pages) TI1

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PARAMETER

TEST CONDITIONS

UC1841 / UC2841

UC3841

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

Power Inputs

Start-Up Current

VIN = 30V, Pin 2 = 2.5V

4.5

Operating Current

VIN = 30V, Pin 2 = 3.5V

Supply OV Clamp

IIN = 20mA

Reference Section

Reference Voltage

TJ = 25°C

4.95

5.0

5.05

4.9

5.0

5.1

Line Regulation

VIN = 8 to 30V

Load Regulation

IL = 0 to 10mA

1020

1030

Temperature Stability

Over Operating Temperature Range

4.9

5.1

4.85

5.15

Short Circuit Current

VREF = 0, TJ = 25°C

-80

-100

-80

-100

Oscillator

Nominal Frequency

TJ = 25°C

kHz

Voltage Stability

VIN = 8 to 30V

0.5

Temperature Stability

Over Operating Temperature Range

kHz

Maximum Frequency

RT = 2k

Ω, CT = 330pF

500

kHz

UC1841

UC2841

UC3841

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the

UC1841, -25°C to +85°C for the UC2841, and 0°C to +70°C for the UC3841; VIN = 20V, RT = 20k

Ω, CT = .001mfd, RR = 10kΩ,

CR = .001mfd, Current Limit Threshold = 200mV, TA = TJ.

Supply Voltage, +VIN (Pin 15) (Note 2)

Voltage Driven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +32V

Current Driven, 100mA maximum . . . . . . . . . . . . Self-limiting

PWM Output Voltage (Pin 12) . . . . . . . . . . . . . . . . . . . . . . . 40V

PWM Output Current, Steady-State (Pin 12) . . . . . . . . . 400mA

PWM Output Peak Energy Discharge . . . . . . . . . . . . 20

µJoules

Driver Bias Current (Pin 14) . . . . . . . . . . . . . . . . . . . . . -200mA

Reference Output Current (Pin 16) . . . . . . . . . . . . . . . . -50mA

Slow-Start Sink Current (Pin 8) . . . . . . . . . . . . . . . . . . . . 20mA

VIN Sense Current (Pin 11). . . . . . . . . . . . . . . . . . . . . . . . 10mA

Current Limit Inputs (Pins 6 & 7) . . . . . . . . . . . . . -0.5 to +5.5V

Stop Input (Pin 4) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +5.5V

Comparator Inputs

(Pins 1, 7, 9-11, 16) . . . . . . . . . . . . Internally clamped at 12V

Power Dissipation at TA = 25°C (Note 3) . . . . . . . . . . . 1000mW

Power Dissipation at TC = 25°C (Note 3) . . . . . . . . . . . 2000mW

Operating Junction Temperature . . . . . . . . . . -55°C to +150°C

Storage Temperature Range. . . . . . . . . . . . . . -65°C to +150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . +300°C

Note 1: All voltages are with respect to ground, Pin 13.

Currents are positive-into, negative-out of the specified

terminal.

Note 2: All pin numbers are referenced to DIL-18 package.

Note 3: Consult Packaging Section of Databook for thermal

limitations and considerations of package.

CONNECTION DIAGRAMS

PLCC-20, LCC-20

(TOP VIEW)

Q or L Package

DIL-18, SOIC-18 (TOP VIEW)

J or N, DW Package

PACKAGE PIN FUNCTIONS

FUNCTION

Comp

Start/UV

OV Sense

Stop

Reset

CUR Thresh

CUR Sense

Slow Start

RT/CT

Ramp

VIN Sense

PWM Out

Ground

Drive Bias

+VIN Supply

5.0V REF

Inv. Input

N.I. Input

ABSOLUTE MAXIMUM RATINGS

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