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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ZXLD1356 датащи(PDF) 4 Page - Diodes Incorporated |
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ZXLD1356 датащи(HTML) 4 Page - Diodes Incorporated |
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4 / 29 page  ZXLD1356 ZXLD1356 Document number: DS33470 Rev. 3 - 2 4 of 29 www.diodes.com December 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Electrical Characteristics (Test conditions: V IN = 12V, T amb = 25°C, unless otherwise specified.) Symbol Parameter Condition Min. Typ. Max. Unit VSU Internal regulator start-up threshold 4.85 5.2 V VSD Internal regulator shutdown threshold 4.4 4.75 V IINQoff Quiescent supply current with output off ADJ pin grounded 65 108 µA IINQon Quiescent supply current with output switching (Note 3) ADJ pin floating, L=68mH, 3 LEDs f=360kHz 1.6 mA VSENSE Mean current sense threshold voltage (Defines LED current setting accuracy) Measured on ISENSE pin with respect to VIN VADJ=1.25V; VIN=18V 195 200 205 mV VSENSEHYS Sense threshold hysteresis ±15 % ISENSE ISENSE pin input current VSENSE=VIN-0.2 4 10 µA VREF Internal reference voltage Measured on ADJ pin with pin floating 1.25 V ΔV REF/ΔT Temperature coefficient of VREF 50 ppm/°C VADJ External control voltage range on ADJ pin for DC brightness control (Note 4) 0.3 2.5 V VADJoff DC voltage on ADJ pin to switch device from active (on) state to quiescent (off) state VADJ falling 0.15 0.2 0.27 V VADJon DC voltage on ADJ pin to switch device from quiescent (off) state to active (on) state VADJ rising 0.2 0.25 0.3 V RADJ Resistance between ADJ pin and VREF 0< VADJ< VREF VADJ>VREF +100mV 30 10.4 50 14.2 65 18 k Ω ILXmean Continuous LX switch current 0.55 A RLX LX switch ‘On’ resistance @ ILX=0.55A 0.5 0.75 Ω ILX(leak) LX switch leakage current 5 µA DPWM(LF) Duty cycle range of PWM signal applied to ADJ pin during low frequency PWM dimming mode PWM frequency <300Hz PWM amplitude =VREF Measured on ADJ pin 0.001 1 Brightness control range 1000:1 DCADJ (*) DC Brightness control range Note 5 5:1 tSS Start up time (See graphs for more details) Time taken for output current to reach 90% of final value after voltage on ADJ pin has risen above 0.3V. Requires external capacitor 22nF. 2 ms fLX Operating frequency (See graphs for more details) ADJ pin floating L=68mH (0.36V) IOUT=0.55A @ VLED=3.6V Driving 3 LEDs 360 kHz fLXmax Recommended maximum operating frequency 500 kHz Notes: 3. Static current of device is approximately 700 µA, see Graph, Page 17. 4. 100% brightness corresponds to VADJ = VADJ(nom) = VREF. Driving the ADJ pin above VREF will increase the VSENSE. threshold and output current proportionally. 5. Ratio of maximum brightness to minimum brightness before shutdown VREF =1.25/0.25. VREF externally driven to 2.5V, ratio 10.1. |
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