Datasheet Linear Technology LT1613 (Linear Technology) - 3

LT1613
W U TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency vs Switch VCESAT vs Switch Current Temperature SHDN Pin Current vs VSHDN
700 2.00 50 TA = 25°C TA = 25°C 600 1.75 VIN = 5V µA) 40 1.50 500 V 1.25 IN = 1.5V 30 400 (mV) 1.00 CESAT 300 V 0.75 20 200 0.50 10 SWITCHING FREQUENCY (MHz) SHDN PIN BIAS CURRENT ( 100 0.25 0 0 0 0 100 200 300 400 500 600 700 –50 –25 0 25 50 75 100 0 1 2 3 4 5 SWITCH CURRENT (mA) TEMPERATURE (°C) SHDN PIN VOLTAGE (V) 1613 G01 1613 G02 1613 G03
Current Limit vs Duty Cycle Feedback Pin Voltage
1000 1.25 900 1.24 800 70°C VOLTAGE 700 1.23 600 25°C 500 1.22 CURRENT LIMIT (mA) –40°C 400 FEEDBACK PIN VOLTAGE (V) 1.21 300 200 1.20 10 20 30 40 50 60 70 80 –50 –25 0 25 50 75 100 DUTY CYCLE (%) TEMPERATURE (°C) 1613 G04 1613 G05
Switching Waveforms, Circuit of Figure 1
VOUT 100mV/DIV AC COUPLED VSW 5V/DIV ISW 200mA/DIV ILOAD = 150mA 200ns/DIV 1613 G06 3