(Hong Kong)
Product Summary
The TL3844P 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. 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 output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
Parametrics
TL3844P absolute maximum ratings: (1)Supply voltage (ICC< 30 mA) : Self limiting; (2)Analog input voltage range, VI(VFB and ISENSE) : –0.3V to 6.3V ; (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: D package =86 °C/W ;D-8 package=97 °C/W;P package 85 °C/W; (9)Virtual junction temperature range, TJ:0°C to 150 °C; (10)Output energy (capacitive load) : 5 μJ ; (11)Lead temperature, 1,6 mm (1/16 inch) from case for 10 seconds : 260 °C ; (12)Storage temperature range, Tstg:–65°C to 150 °C.
Features
TL3844P 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.
Diagrams
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 TL3844P |
Texas Instruments |
Current Mode PWM Controllers Current Mode PWM |
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TL3844PE4 |
Texas Instruments |
Current Mode PWM Controllers Current-Mode PWM Controller |
Data Sheet |
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