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ADP8140ACPZ-1-R7 数据表(PDF) 4 Page - Analog Devices |
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ADP8140ACPZ-1-R7 数据表(HTML) 4 Page - Analog Devices |
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4 / 23 page  ADP8140 Data Sheet Rev. B | Page 4 of 23 Parameter Symbol Test Conditions/Comments Min Typ Max Unit SINKx Leakage Current ISINK(LKG) SINKx pin = 4 V 8 12 μA Channel Clamp Threshold Low VCH_CLMP_LOW Threshold on SINKx to trigger VCH_CLMP_LOW, MIN pin = GND 7.4 7.75 8.1 V High VCH_CLMP_HIGH Threshold on SINKx to trigger VCH_CLMP_HIGH 14.5 15.1 15.7 V Channel Clamp Current Low ICLMP_LOW Channel pull-down current when SINKx > CHCLMP_LOW, RSET = 7.32 kΩ 315 350 385 mA High ICLMP_HIGH Channel pull-down current when SINKx > CHCLMP_HIGH 430 510 600 mA Channel Clamp Hysteresis VCH_CLMP_HYS Hysteresis after either channel clamp is triggered 1.2 V Lowest SINKx Current Output current for DIM = 0 V and RSET = 10 kΩ (see Figure 15) 125 μA INPUT CONTROLS Input Threshold (Low) VIL 0.6 V Input Threshold (High) VIH 1.1 V EN Input Resistance REN EN = 1.2 V 400 kΩ MODE Pin Pull-Up Current IM 15 20 24 μA MODE Threshold 1, 30.1 kΩ VM1 Threshold for increasing mode voltage to enter dc buffer operation 0.35 0.4 0.45 V MODE Threshold 2, 52.3 kΩ VM2 Threshold for increasing mode voltage to enter PWM buffer operation 0.75 0.8 0.85 V MODE Threshold 3 VM3 Threshold for increasing mode voltage to enter PWM EA operation 1.25 1.3 1.35 V LED SCALING CONTROLS DIM and VT Limit Voltage VTLIMIT VT (and DIM if MODE = GND) voltage to produce 100% output current 1.9 2.0 2.1 V Dimming Accuracy ILED_DIM1 ILED_DIM1/ILED_100, VT = 1 V, MIN = 0 V, RSET = 25.5 kΩ 48 50 52 % ILED_DIM2 ILED_DIM2/ILED_100, DIM = 0.2 V, MODE = GND, RSET = 25.5 kΩ 9.4 10 10.4 % ILED_DIM3 ILED_DIM3/ILED_100, DIM = 50%,140 Hz, MODE = REG, RSET = 25.5 kΩ 48 50 52 % VT Pull-Up Current Source 0.6 1 μA DIM Pin Frequency Range MODE = REG 0.14 40 kHz MIN Comparator Hysteresis VMIN_HYS 55 mV MIN Pin PWM Mode Threshold VMIN_PWM Voltage on MIN pin at which VT changes from scaling LED current to pulsing LED current 2.2 2.3 2.4 V PWM Delay and Rise/Fall Time Delay from VT low to high (or high to low) to LED current low to high (or high to low), MIN = REG 20 μs THERMAL FOLDBACK (INTERNAL) Thermal Foldback Threshold TFBTHRES 135 °C Thermal Shutdown Threshold TSDTHRES 150 °C Thermal Shutdown Hysteresis TSDHYS 20 °C FAULT DETECTION A FAULTE A Threshold VFAULT_TH Threshold for A FAULTE A comparator 1.14 1.2 1.26 V A FAULTE A Hysteresis VFAULT_HYS Hysteresis for A FAULTE A comparator 100 mV A FAULTE A Filter tFAULT VO_SNS and A FAULTE A shutdown noise filter 10 μs A FAULTE A Pull-Down Resistance A FAULTE A PD Fault activated 7 15 20 Ω VO_SNS Threshold VVO_SNS_TH Threshold for VO_SNS comparator 1.176 1.2 1.224 V Hysteresis VVO_SNS_HYS Hysteresis for VO_SNS comparator 50 mV Leakage Current IVO_SNS 50 nA Open SINKx Fault Threshold VSFD_OPEN SINKx pin voltage threshold to remove a sink from the feedback loop after a VOUT_OVP fault 80 mV |
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