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T8322AD Dataheets PDF



Part Number T8322AD
Manufacturers TM Technology
Logo TM Technology
Description PWM Control 1500mA Step-Down Converter
Datasheet T8322AD DatasheetT8322AD Datasheet (PDF)

tm TE CH Preliminary T8322AD PWM Control 1500mA Step-Down Converter FEATURES • Wide Input Voltage Range: 4.5V to 30V • LED Output Current Up to 1500mA • Soft-start • Single pin on/off and brightness control using DC voltage or PWM • High efficiency (up to 97%) • Up to 1MHz switching frequency • Typical 5% output current accuracy •SOP-8 Lead-free Package Applications • LED/Display Back Light Driver • Lightings • Portable Communication Devices • Handheld Electronics GENERAL DESCRIPTION The T832.

  T8322AD   T8322AD



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tm TE CH Preliminary T8322AD PWM Control 1500mA Step-Down Converter FEATURES • Wide Input Voltage Range: 4.5V to 30V • LED Output Current Up to 1500mA • Soft-start • Single pin on/off and brightness control using DC voltage or PWM • High efficiency (up to 97%) • Up to 1MHz switching frequency • Typical 5% output current accuracy •SOP-8 Lead-free Package Applications • LED/Display Back Light Driver • Lightings • Portable Communication Devices • Handheld Electronics GENERAL DESCRIPTION The T8322AD is a continuous mode inductive step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input supply between 4.5V and 30V and provides an externally adjustable output current of up to 1500mA. Depending upon supply voltage and external components, this can provide up to 24 watts of output power. The T8322AD includes the output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. The T8322AD is available in SOP-8 Lead-free package. PART NUMBER EXAMPLES PART NO. T8322AD PACKAGE SOP-8 TM Technology, Inc. reserves the right P. 1 to change products or specifications without notice. Publication Date: Sep. 2014 Revision:C tm TE CH PIN ARRANGEMENT(Top view) Preliminary T8322AD PIN DESCRIPTION Symbol LX GND EN ADJ ISENSE VIN SOP-8 Description 3,4 Drain of NDMOS switch 5.6 Ground 1 Enable control signal, H: Active, L: Power Down ADJ Multi-function Dimming and brightness control pin: Leave floating for normal operation.(VADJ=VREF=1.25V giving nominal 2 average output current IOUTnom = 0.1/RS) Drive with DC voltage(0.25V < VADJ <1.25V) to adjust output current from 0% to 100% of IOUTnom TTL PWM Dimmering input MAX ADJ frequency 20KHz. 8 Connect resistor Rs from this pin to VIN to define nominal average output current IOUTnom=0.1/Rs Input voltage (4.5V to 30V). 7 Decouple to ground with 47uF or higher X7R ceramic capacitor close to device. TM Technology, Inc. reserves the right P. 2 to change products or specifications without notice. Publication Date: Sep . 2014 Revision:C tm TE CH ABSOLUTE MAXIMUM RATINGS Parameter Voltage on input pin relative to GND ISENSE pin Voltage EN pin &ADJ pin Voltage Operating junction Temperature Rang Operating Temperature Rang Maximum Soldering Temperature (at lead, 10sec) Storage Temperature Rang Power Dissipation, PD @ TA=25℃ Package Thermal Resistance, θJA Preliminary T8322AD Symbol VIN Tj TA TLEAD TS SOP-8 SOP-8 Value -0.3 to +40 -5 to +0.3 -0.3 to +6 -40 to 150 -40 to 105 300 -65 to +150 0.8 50 Unit V V V ℃ ℃ ℃ ℃ W ℃/W Electrical Characteristics (TA=-40 to 85℃ unless otherwise noted. Typical values are at TA=25℃, VDD=24V) Symbol Description Conditions Min. Typ. Max. Unit VIN Input voltage UVLO Under Voltage lock out VIRU Internal regulator start-up threshold VIRD Internal regulator shutdown VIN r.


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