Transcription of BOOST/BUCK-BOOST/BUCK/CONTROLLER IC with External …
1 Tm TE. CH Preliminary T8332AD. BOOST/BUCK-BOOST/BUCK/CONTROLLER IC with External MOSFET. FEATURES GENERAL DESCRIPTION. 5 - 60V input voltage range The T8332AD is designed to operate as a Single resistor programmable constant constant current source for driving high current current driver LEDs. It is a current mode control IC which Excellent constant current accuracy 3% provides a good line transient response. The typically device can provide an excellent constant current feedback reference voltage tailor- accuracy of +/-3% typically. Moreover, the IC. made for LED application also provide several protection features like IC.
2 Support Boost/ buck / buck -Boost overvoltage protection, cycle by cycle current configuration limit protection and thermal shutdown DC Dimming & PWM dimming protection. On-chip thermal shutdown at 170oC. Fixed switching frequency 430kHz Dithering in oscillator frequency to PART NUMBER EXAMPLES. simplify the EMI design Cycle-by-cycle current limit Over-current protection PART NO. PACKAGE. IC overvoltage protection 15 A shutdown current T8332AD SO8-EP. SO8-EP package Applications High Power LED Driver LED illuminance LCD backlight illumination Automotive interior lighting Automotive Headlights PIN ARRANGEMENT.
3 SO8-EP Version (T8332AD 9 PINS). TM Technology, Inc. reserves the right P. 1 Publication Date: 2017. to change products or specifications without notice. Revision:A tm TE. CH Preliminary T8332AD. TYPICAL APPLICATION. ( buck -BOOST). TM Technology, Inc. reserves the right P. 2 Publication 2017. to change products or specifications without notice. Revision:A tm TE. CH Preliminary T8332AD. PIN DESCRIPTION. T8332AD 9 PINS. Pin No. Pin Name Pin Description 1 DIM DC Dimming Function pin. 2 COMP Compensation pin. Connect a resistor for the current mode control and cycle by 3 CS. cycle current limit function.
4 4 GATE Switch gate drive 5 VREG Internal regulator 6 VIN Main supply 7 VSN Load current sense ve input 8 EN Enable the chip 9 GND Ground Pin. IC ground.(Package EP). TM Technology, Inc. reserves the right P. 3 Publication 2017. to change products or specifications without notice. Revision:A tm TE. CH Preliminary T8332AD. ABSOLUTE MAXIMUM RATINGS. Parameter Symbol Value Unit VIN pin voltage relative to GND to +60 V. DIM pin voltage relative to GND to + V. GATE to +10 V. VSN VIN - 1 V. VREG to +8 V. COMP ENand CS pin voltage to + V. relative to GND. o Junction temperature range TJ -40 to +150 C.
5 Maximum soldering temperature o TLEAD 300 C. (at leads, 10sec). o Storage temperature range TS -65 to +150 C. Power dissipation at 70oC, SOP8-EP 800 mW. TM Technology, Inc. reserves the right P. 4 Publication 2017. to change products or specifications without notice. Revision:A tm TE. CH Preliminary T8332AD. Electrical Characteristics Denotes the specifications which apply over the full operating temperature range TJ = -40oC to o o +125 C, VIN = 12V. Otherwise specifications are at TA = 25 C, VIN = 12V. Symbol Description Conditions Min. Typ. Max. Unit Supply and Reference VINOVP VIN overvoltage V.
6 VIN Operating voltage range ** 5 60 V. VINUV VIN under-voltage Decreasing VIN V. VIN under-voltage VINUV 260 mV. hysteresis Operating quiescent fOSC = 430kHz; Gate IQ 3 mA. current Driving at 1nF. IC shutdown by IOFF Shutdown current 20 26 A. VEN < VEN_OFF. VREG Regulation pin voltage VIN = 12V, IREG = -10mA 8 V. VREG under-voltage turn- VREGUV Decreasing VREG V. off VREG under-voltage VREGUV 350 mV. hysteresis VREGCL VREG current limit VREG short to GND -25 -52 mA. Oscillator and Soft Start fOSC Oscillator frequency 365 430 495 kHz LED Current Sense and Control Differential input voltage EN=High, VIDL 97 100 103 mV.
7 (Active) VIDL = VIN - VSN. LED Over current EN=High, VOCLED 142 160 175 mV. threshold VSP - VSN. VDIM,ON DC Dimming ON V. DC Dimming Control DC voltage on the DIM. VDIM,MAX V. for Full Brightness pin DC Dimming Control DC voltage on the DIM. VDIM,MIN V. for Gate Driver OFF pin Gate Drive Output Loading Cap = TR Turn-On Rise Time 30 ns (from 10% to 90%). Loading Cap = TF Turn-Off Fall Time 30 ns (from 90% to 10%). VOL Output low level VOH Output high level VREG V. DMAX Maximum duty cycle 88 92 96 %. TM Technology, Inc. reserves the right P. 5 Publication 2017. to change products or specifications without notice.
8 Revision:A tm TE. CH Preliminary T8332AD. Symbol Description Conditions Min. Typ. Max. Unit Switch Current Sense Switch over-current SWOCP 440 500 560 mV. threshold voltage ACS Voltage Gain 4 V/V. IBIASS Input Bias Current -24 -32 -40 A. Slope Compensation Sawtooth current added to ISLOPE Slope Injection Current -97 A. current sense (CS) pin Logic Inputs and Outputs EN pin chip enable VEN_ON VEN rising 2 V. voltage threshold EN pin chip disable VEN_OFF V. voltage threshold tDIS Disable time fOSC = 430kHz 38 ms Dither Generator Dither Modulation fDITH fOSC = 430kHz kHz Frequency fSPREAD Dither Frequency Range % of switching frequency +/-4 %.
9 Protection At start up, tFB Fault blank timer ms fOSC = 430kHz LED short protection VSCL VSP - VOUV 260 300 330 mV. voltage LED open protection VOCL VSP - VOUV V. voltage Over-temperature Measured at junction, o TSD * 170 C. warning threshold* temperature increasing Over-temperature Measured at junction, o TSDHYS * 35 C. hysteresis* recovery = TSD-TSDHYS. Function is correct but parameters are not guaranteed. ** At VIN equals 5-6V and >50V, the part only guarantees GATE pin switching but not guarantee to follow the electrical parameters. *Parameters are not tested at production and guaranteed by design, characterization and process control.
10 TM Technology, Inc. reserves the right P. 6 Publication 2017. to change products or specifications without notice. Revision:A tm TE. CH Preliminary T8332AD. Block Diagram T8332AD Block diagram FUNCTIONAL DESCRIPTION. T8332AD is a constant current LED driver which can be configured as a Boost, buck and buck - Boost converter. It depends on the user's the choice of the number of LED in the output. Typical converter application circuits of T8332AD are shown in the next section. VIN. The VIN is the power supply voltage pin for the supply to the control circuit of T8332AD. The pin has an UVLO function, once voltage on the pin reaches ; the IC is ready to start the operation.
