ZXLD1374 LED驱动芯片资料.pdf

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Diodes公司推出全新ZXLD1374 LED驱动器,全面提升高亮度汽车、工业及商用照明系统的性能。该驱动器采用降压 (buck)、升压 (boost
DDES A Product line of Diodes Incorporated ZETEX ZXLD1374 Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated Symbol Parameter Rating Unit Vu Input supply voltage relative to GND 0.3to65 VAUX Auxiliary supply voltage relative to GND 0.3to65 VISM Current monitor input relative to gnd 0.3to65 V: SENSE Current monitor sense voltage(VIN-VISM) 0.3to5 Low side switch output voltage to GND 0.3to65 VVVVVA Low side switch continuous output current STATUS Status pin output current mA VELA Flag output voltage to GND -0.3to40 VPWM, Vad Hao. Other input pins to GND -0.3to5.5 TADJ, VGI T Maximum junction temperature 150 C Storage temperature 55to150 These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure Operation at the absolute maximum rating for extended periods may reduce device reliability Semiconductor devices are Esd sensitive and may be damaged by exposure to EsD events Suitable ESD precautions should be taken when handling and transporting these devices Notes: * For correct operation SGNd and PGnd should always be connected together Package Thermal data Thermal resistance Package Unit Junction-to-Case e TSSOP-20EP 4 Recommended Operating Conditions Symbol Parameter Performance/comment Min Max Unit ViN Input supply voltage range rmal operation 60 Functional(Note 2 6.3 Normal operation VAUX Auxiliary supply voltage range(Note 3) 60 Functional 6.3 vsense Differential input voltage MsM,wh0s∨A5250450mV Vix Low side switch output voltage 60 ILxLow side switch continuous output current 1.5 External dc control voltage applied to ADJ DC brightness control mode ADJ from 10 to 200% 012525 lpin to adjust output current status Status pin output current 100A IREF Reference external load current REF sourcing current mA fsw Recommended switching frequency range(Note 4) 3001000kHz VTADJ Temperature adjustment(TADj) input voltage range VREE To maintain 1000: 1 resolution 100 500 fpWM Recommended PWM dimming frequency range To maintain 200: 1 resolution 100 1000 Hz tpwMhL PWM pulse width in dimming mode PWM input high or low 0.00510ms VpWMH PWM pin high level input voltage 2 55 VpwML PWM pin low level input voltage 0.4 T Operating Junction Temperature Range 40 125 GIGain setting ratio for Boost and Buck-boost modes Ratio=VGI/ADJ 0.2 0.50 Notes: 2. The functional range of VIN is the voltage range over which the device will function. Output current and device parameters may deviate from their normal values for VIN and vaux voltages between 6.3v and 8V, depending upon load and conditions 3. VALx can be driven from a voltage higher than vin to provide higher efficiency at low VIN voltages, but to avoid false operation; a voltage should not be applied to Vaux in the absence of a voltage at VIN 4. The device contains circuitry to control the switching frequency to approximately 400kHz. The maximum and minimum operating frequency is not tested in production ZXLD1374 Page 3 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated DDE A Product line of Diodes Incorporated ZETEX ZXLD1374 Electrical Characteristics (Test conditions: VIN=VAUX= 12V, TA=25 C, unless otherwise specified. Symbol Parameter Conditions Min Typ MaxUnits Supply and reference parameters Under-Voltage detection threshold VIN or VAUx falling Normal operation to switch disabled 525663 Under -Voltage detection threshold VIN or VAux rising 55 6|65 Switch disabled to normal operation lQ Quiescent current into Vin ■ PWM pin floating. 1.5 3 mA lQ-Aux Quiescent current into VAUX Output not switching 150300pA Standby current into VIN PWM pin grounded 90150 A B-AUX Standby current into VAu re than 1 5m 0.7 0 HA HbDaouz Internal reference voltage No load 12371.251.263|V Change in reference voltage with output Sourcing 1mA 5 △VREF current mV Sinking 25uA 5 VREF LINE Reference voltage line regulation VIN=VAUX, 6.5V<VIN=<60V 60 dB VREF-TC Reference temperature coefficient +/-50 ppm/°C DC-DC converter parameters External dc control voltage applied to ADJ DC brightness control mode ADJ pin to adjust output current(Note 5) 10%to200% 01251.2525 VAD」≤25V 100 lADJ ADJ input current(Note 5) A VADJ=5.0V 5 A GIVoltage threshold for boost and Buck boost modes selection(Note 5) VADJ=1.25V 08V Ve≤25V 100nA GI GI input current(Note 5) =50V A lp PWM input curren VPWM=5.5V 36100uA PWM pulse width to enter shutdown state) PWM input low 101525ms Thermal shutdown upper threshold SDH (LX output inhibited Temperature rising 150 Thermal shutdown lower threshold TSDi 125 (LX output re-enabled emperature falling High-Side Current Monitor(Pin ISM) Input Current Measured into ISM pin and VISM= vIN 11 HA Vsense ac Accuracy of nominal VsENse threshold ±025±2 voltage % VADJ=1.25V VsENSE-oc Over-current sense threshold voltage 300350375mV Notes: 5. The aDj and gl pins have an internal clamp that limits the internal node to less than 3V. this limits the switch current should those pins get overdriven ZXLD1374 Page 4 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated A Product line of Diodes Incorporated ZETEX ZXLD1374 Electrical Characteristics (Test conditions: VIN= VAUX= 12V, TA=25 C, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units Output Parameters VFLAGL FLAG pin low level output voltage Output sinking 1mA 05V IFLAGOFF FLAG pin open-drain leakage current VFLAG=40V A Normal operation 4.5 4.8 of regulation(VSHP out of range)I3.33.63.9 (Note 7) VIN under-voltage(VIN<5.6V) 3.3 3.6 3.9 STATUS Flag no-load output voltage Switch stalled(tON or toFF> 100us 3.3 3.6 3.9 VsTATUS I(Note 6 LX oVer-voltage state (VLx >601) 2.4 2.7 3.0 HbDaouz Over- temperature(T」>125°c) 1.5 1.8 2.1 Excess sense resistor current (VSENSE>0.375V) 060.912 Excessive switch current(Isw?1.5A)0.60.9 StATUs Output impedance of STATUS output Normal operation 10 kQ Low side switch output(LX pins tied together lLx-LG Low side switch leakage current Output stage off, VLx=60V(Note 8) 60 A RDS(ON) LX pin MOSFET on resistance lx =1.5a ( toN < 100us 0.50.8 tpdhl Propagation delay high- low 86 ns tpdlh Propagation delay low-high VsENSE 225mV+ 30%, CL= 680pF 131 ns tLXR LX output rise time RL=1209 208 ns XF LX output fall time 12 ns Time to assert'STALL' flag and tsTALL warning on STATUS output LX low or hig h 100170us (Note 9) LED Thermal control circuit (TADS) parameters Onset of output current reduction ADJH Upper threshold voltage TAD] falling) 560625690mV Output current reduced to <10% of DJL Lower threshold voltage set value(VTAD falling) 380 440500 n∨ ADJ TADJ pin Input current VTADJ=1.25V A Notes: 6. In the event of more than one fault/warning condition occurring, the higher priority condition will take precedence. E.g Excessive coil current and 'Out of regulation occurring together will produce an output of 0. 9v on the STATUS pin. The oltage levels on the STATUS output assume the Internal regulator to be in regulation and VADJ<=VREF. A reduction of the voltage on the staTUs pin will occur when the voltage on Vin is near the minimum value of 6 7. Flag is asserted if VsHp<2. 5V or VsHP>3.5v 8. With the device still in switching mode the LX pin has an over-valtage detection circuit connected to it with a resistance of approximately 1MQ2 9. If toN exceeds tsTALL, LX turns off and then an initiate a restart cycle occurs. During this phase, ADJ is grounded internally and the SHP pin is switched to its nominal operating voltage, before operation is allowed to resume. Restart cycles will be repeated automatically until the operating conditions are such that normal operation can be sustained. If toFF exceeds tsTALL, the switch will remain off until normal operation is possible ZXLD1374 Page 5 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated DDE A Product line of Diodes Incorporated ZXLD1374 Typical Characteristics 1500 1900 2.5 1250 750 000 600 5 E与Oa 750 L requency 500 300 HbDaouz 0.5 0 150 0 6121824303642485460 0.5 2.5 Supply Voltage (V ADJ Voltage(v) Figure 1. Supply Current vs Supply Voltage Figure 2. Buck LED Cument, Sw itching Frequency VS. VADJ 700 1400 700 650 600 1200 600 500 500 450 800 400 E 400b LED 350 30 600L 300 Switching 300 Ftequency 400 200 200 150 AUX VIN=24V 100 aLE DS 200 100 12 LEDS L= 33UH L= 33uH G|=0.23 Rs=300mQ2 Rs=300ITS2 0 0.5 2. 00.250.50.7511.251.51.7522.252.5 ADJ Voltage ADJ Voltage Figure 3. Buck-Boost LED Current, Swit ching Frequency VS. VADJ Figure 4. Boost LED Current, Sw itching Frequency VS. VAD. 1500 1250 PwM=100HZ 上750 500 CHI 10.0VEW CH2 500mA M 10QUs CH4飞1,48V 010203040506070 90100 CH41.00V 100000kHz PWM Duty Cycle (%) Figure 5. ILED VS PWM Duty Cycle Figure 6. ILED VS time -PWM pin transient response ZXLD1374 Page 6 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated DDE A Product line of Diodes Incorporated ZXLD1374 Typical Characteristics 100% 1.252 1.2515 80% 1.251 60% 1.2505 1.25 40% HbDaouz b1.2495 1.249 20% 1.2485 0% 250 1.248 75010001250 40-25-105203550658095110125 TAD Pin Voltage(mv) Junction Temperature( C) Figure 7. LED Current VS. TAD Voltage Figure 8. VREF VS. Tempe rature 0.9 100% 90% TA=25C 0.8 0.7 80% Buck Mode 2LED S 70% occ0m2c○=0 0.6 60% 0.5 50% 0.4 40% 0.3 30% 0.2 20% N 12V 1y=13A 10% 0 40-25-105203550658095110125 6121824303642485460 Junction Temp erature( C) Input Voltage(V) Figure 9. RDS(ON) VS. Temperature Figure 10. Duty Cycle vs Input Voltage ZXLD1374 Page 7 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated DDE A Product line of Diodes Incorporated ZETEX ZXLD1374 Typical Characteristics - Buck Mode-Rs=146mQ2-L= 33WH-ILED=1.5A 1.65 TA=25°C 1.60 146mg 9 LED S 11 S 3 LEDS 15 LE DS 1.55 150 1.45 HbDaouz 7 LEDS 1.40 1.35 18 36 42 48 Input Voltage(V Figure 11 Load Current VS Input Volta ge and Number of LED 1200 1000 L=33H Rs=146mΩ 800 8600 400 200 3 LED S 7 LED S 13 LE DS 1 LED 5 LEDS 9 LED S 11 LEDS 15 LEDs 30 Input Voltage(V) Figure 12. Frequen cy Vs Input Voltage and Number of LED 100% 95% 5 LEDS 90% 85% 3 LEDS 7 LEDs 9 LEDS 11 LED S 13 LEDS 80% 1 LED 75% 70% TA=25℃C 65% R 46mQ 60% 18 48 Input Voltage(M) Figure 13 Efficiency vs Input Voltage and Number of LED ZXLD1374 Page 8 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated DES A Product line of Diodes Incorporated ZXLD1374 Typical Characteristics-Buck Mode-Rs=291m2-L=33WH-ILED=750mA 0.825 AUX L=33μH 0.800 Rs=291ms2 3 LEDS 7 LEDS 11 LED S 15 LEDS 0.775 LED 5 LEDS 9 LEDS 13 LE DS 与0.750 0.725 HbDaouz 0.700 0.675 12 24 36 42 48 In put Voltage LED Input voltage and number of LED 1000 11 LEDS 900 AL IX IN L E 33HH 9LED S 800 7 LEDS 700 600 5LEDS 500 3 LED S 13 LEDS 400 200 100 24 30 36 48 Input voltage Figure 15. Frequency ZXLD1374-Buck Mode =L=47HH 100% 5 LED S 7 LED S 9 LED S 11 LED S ▲13LEDs 15 LE DS 95% 3 LEDS 90% 85% 80% 75% 70% 65% L= 33uH =291m 18 nput Voltage( Figure 16 Efficiency Vs Input Voltage and Number of LED ZXLD1374 Page 9 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated DDE A Product line of Diodes Incorporated ZXLD1374 Typical Characteristics- Boost mode-Rs= 150m12-L= 33HH-ILED=325mA-GIRATIO=0.21 0.358 TA=25C L= 33uH 0.347 150mO eH1=33k2 RGU 0.336 与0.325 0.314 HbDaouz 6 LED S 8 LED s 0.303 10 LEDS 12 LE DS 14 LE DS 16 LEDS 0.292 17 47 Figure 17. ILi In put and number of led 700 TA=25°c 600 R G/=33k0 500 450 400 350 14 LE DS 16 LEDS 6 LED 10 LEDS 20 32 42 Vol tage (V) Figure 18 Frequency Vs Input Voltage and Number LED 100% 6 LEDS 8 S 10 LEDS 12 LEDS 14 LEDS 16 LE 95% 90% 85% TA=25C 80% 75% Input Voltage (V) Figure 19 Efficiency Vs Input Voltage and Number of LED ZXLD1374 Page 10 of 35 October 2010 Document number: Ds35032 Rev, 1.2 www.diodes.com o Diodes Incorporated

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