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TL3844B

Texas Instruments
Part Number TL3844B
Manufacturer Texas Instruments
Description HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
Published Oct 10, 2019
Detailed Description www.ti.com TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS SLVS610B – AUGUST 2006 – REVISED JULY 2007 F...
Datasheet PDF File TL3844B PDF File

TL3844B
TL3844B

Overview
www.
ti.
com TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS SLVS610B – AUGUST 2006 – REVISED JULY 2007 FEATURES • Low Start-Up Current (<0.
5 mA) • Trimmed Oscillator Discharge Current • Current Mode Operation to 500 kHz • Automatic Feed-Forward Compensation • Latching PWM for Cycle-by-Cycle Current Limiting • Internally Trimmed Reference With Undervoltage Lockout • High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis • Double-Pulse Suppression D (SOIC) OR P (PDIP) PACKAGE (TOP VIEW) COMP VFB ISENSE RT/CT 1 2 3 4 8 VREF 7 VCC 6 OUTPUT 5 GND D (SOIC) PACKAGE (TOP VIEW) COMP NC VFB NC ISENSE NC RT/CT 1 2 3 4 5 6 7 14 VREF 13 NC 12 VCC 11 VC 10 OUTPUT 9 GND 8 POWER GROUND NC − No internal connection DESCRIPTION/ORDERING INFORMATION The TL284xB and TL384xB series of control integrated circuits provide 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.
Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is trimmed for accuracy at the error amplifier input.
Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that 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.
The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements.
The start-up current is specified to be 0.
5 mA (max), while the oscillator discharge current is trimmed to 8.
3 mA (typ).
In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.
2 V while sinking 10 mA (VCC = 5 V).
Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.
Typical UVLO thresholds of 16 V ...


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