Datasheet LT3952A (Analog Devices) - 9

LT3952A
TYPICAL PERFORMANCE CHARACTERISTICS IVINP-IVINN Threshold vs Temperature IVINCOMP vs IVINN-IVINP OVLO Thresholds vs Temperature
64 1.6 1.275 1.250 62 1.2 OVLO RISING 1.225 60 OVLO FALLING 0.8 1.200 58 IVINCOMP (V) IVINP-IVINN (mV) 1.175 0.4 OVLO THRESHOLDS (V) 56 1.150 54 0 1.125 –50 0 50 100 150 0 20 40 60 80 –50 0 50 100 150 TEMPERATURE (°C) IVINP-IVINN (mV) TEMPERATURE (°C) 3952A G28 3952A G29 3952A G30
PWM Generator Duty Cycle PWM Generator Frequency PWM Generator Currents vs DIM Voltage vs PWM Capacitor vs Temperature
120 10000 25 DIM PULLUP CURRENT 20 100 1000 15 80 PWM PULLUP CURRENT 10 60 100 5 CURRENT (µA) 0 40 PWM FREQUENCY (Hz) 10 –5 20 PWM PULLDOWN CURRENT PWM GENERATOR DUTY CYCLE (%) –10 0 1 –15 0 0.5 1 1.5 2 0 10 100 1000 –50 0 50 100 150 DIM VOLTAGE (V) PWM CAPACITOR (nF) TEMPERATURE (°C) 3952A G31 3952A G32 3952A G33
PWM Generator Thresholds PWM Generator Operation vs Temperature and Step
1.6 UPPER THRESHOLD 1.2V PWM 1.4 THRESHOLD PWM 0.5V/DIV 1.2 DIM 1 0.5V/DIV 0.8 ILED 0.6 THRESHOLD (V) LOWER THRESHOLD 200mA/DIV 0.4 3952A G35 0.2 10ms/DIV DIM = 0.5V 0–50 0 50 100 150 TEMPERATURE (°C) 3952A G34 Rev A For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Revision History Typical Application Related Parts