Product Summary

The TL3842P is a current-mode pwm controller. It provides the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. The TL3842P can operate to duty cycles approaching 100%. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (which also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The TL3842P is characterized for operation from 0℃ to 70℃.

Parametrics

TL3842P absolute maximum ratings: (1)Supply voltage(ICC < 30 mA): Self limiting; (2)Analog input voltage range, VI (VFB and ISENSE): –0.3 V to 6.3 V; (3)Output voltage, VO (OUTPUT): 35 V; (4)Input voltage, VI, (VC, D package only): 35 V; (5)Supply current, ICC: 30 mA; (6)Output current, IO: ±1 A; (7)Error amplifier output sink current: 10 mA; (8)Package thermal impedance, θJA: 86℃/W; (9)Virtual junction temperature range, TJ: 0℃ to 150℃; (10)Output energy (capacitive load): 5 mJ; (11)Lead temperature, 1,6 mm (1/16 inch) from case for 10 seconds: 260℃; (12)Storage temperature range, Tstg: –65℃ to 150℃.

Features

TL3842P features: (1)Optimized for Off-Line and dc-to-dc Converters; (2)Low Start-Up Current (<1 mA); (3)Automatic Feed-Forward Compensation; (4)Pulse-by-Pulse Current Limiting; (5)Enhanced Load-Response Characteristics; (6)Undervoltage Lockout With Hysteresis; (7)Double-Pulse Suppression; (8)High-Current Totem-Pole Output; (9)Internally Trimmed Bandgap Reference; (10)500-kHz Operation; (11)Error Amplifier With Low Output Resistance; (12)Designed to Be Interchangeable With UC2842 and UC3842 Series.

Diagrams

TL3842P block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
TL3842PE4
TL3842PE4

Texas Instruments

Current Mode PWM Controllers Current-Mode PWM Controller

Data Sheet

0-1: $0.50
1-25: $0.40
25-100: $0.36
100-250: $0.32
TL3842P
TL3842P

Texas Instruments

Current Mode PWM Controllers Current Mode PWM

Data Sheet

0-1: $0.48
1-25: $0.44
25-100: $0.34
100-250: $0.34