QX9920

Second version QX9920 LED IC QX9920 QX9920 ， LED IC，， off-time ，， ， LED 。 QX9920 off-time ， 2.5MHz， 、，。 EN PWM ， LED 。 ， LED ， LED ， LED 1 。 LED ， 10mA 1A ：90% ：4.5V~24V ：500KHz~2.5MHz LED ：LED 1 LED PWM ： EN ， LED SOT-23-6 +12V/24V LED RGB LED LED LED V IN L Zener D iode 5V -5.5V Roff Coff VDD Bandgap QX9920 TOFF Offtim e EN GND SQ R 250mV + DRV CS D RCS LEDs Second Version DRV 1 6 CS SOT-23-6 VSS 2 5 TOFF QX9920 EN 3 4 VDD QX9920 Pin No. 1 2 3 4 5 6 Pin Name DRV VSS EN VDD TOFF CS Description Driver Ground Chip Enable Power supply (4.5V-6.5V) Off time selection Current sensing Type Voltage Current Power dissipation Thermal ESD Symbol Description Vmax Maximum voltage on VOUT and VLX pins Vmin-max Voltage range on EN pins IEXTmax Maximum current on EXT pin Pdip-8 Maximum Power dissipation for DIP-8 package Psot-23-5 Maximum Power dissipation for SO-8 package Tmin-max Operation temperature range Tstorage Storage temperature range VESD ESD voltage for human body mode Value 8 -0.3-VOUT+0.3 100 0.8 0.6 -20-85 -40-165 2000 Unit V V mA W W oC oC V Second Version Parameter Input voltage Start-up voltage Feedback voltage at CS pin Oscillation frequency Efficiency Input current at no load Input standby current EN “High” voltage level EN “low” level EN “high” input current Symbol VDD VSTART Vcs F η IIN0 IINQ Test Condition ILOAD=1mA, VIN:0→2V VIN=5V No load, EN=“low” QX9920 Min Typ Max 4.5 6 4.5 ...