Datasheet LT1533 (Analog Devices) - 4

LT1533
W U TYPICAL PERFORMANCE CHARACTERISTICS Minimum Input Voltage vs Temperature Change in ILIM vs DC Switch Voltage Drop
2.70 0 0.7 0.6 –50 2.65 125°C 25°C 0.5 –100 125 2.60 °C 0.4 85°C (mA) –150 25°C 0.3 2.55 ∆I LIM –200 INPUT VOLTAGE (V) SWITCH VOLTAGE (V) 0.2 2.50 –250 0.1 2.45 –300 0 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 0 0.2 0.4 0.6 0.8 1.0 JUNCTION TEMPERATURE (°C) DUTY CYCLE (%) SWITCH CURRENT (A) 1533 G01 1533 G02 1533 G03
Feedback Voltage and Input Negative Feedback Voltage and Error Amplifier Transconductance Current vs Temperature Input Current vs Temperature vs Temperature
1.30 2.0 –2.30 35 2000 g 1.29 1.8 1900 m = ∆IVC /∆VFB FEEDBACK INPUT CURRENT ( –2.35 1.28 1.6 NFB INPUT CURRENT ( 1800 –2.40 30 1.27 1.4 1700 VNFB –2.45 1.26 1.2 1600 VFB 1.25 1.0 –2.50 25 1500 1.24 0.8 1400 –2.55 µ 1.23 0.6 A) 1300 FEEDBACK VOLTAGE (V) I –2.60 20 FB µA) 1.22 0.4 TRANSCONDUCTANCE (mho) 1200 NEGATIVE FEEDBACK VOLTAGE (V) –2.65 INFB 1.21 0.2 1100 1.20 0 –2.70 15 1000 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1533 G04 1533 G05 1533 G06
Switching Frequency vs VC Pin Threshold and Clamp Feedback Pin Voltage Error Amplifier Output Current Voltage vs Temperature
120 500 1.6 400 1.4 100 –40°C µA) 300 125°C 1.2 VC PIN CLAMP 200 VOLTAGE 80 25°C 100 1.0 60 0 0.8 –100 PIN VOLTAGE (V) 0.6 40 C –200 V 0.4 V –300 C PIN 20 ERROR AMPLIFIER OUTPUT ( THRESHOLD SWITCHING FREQUENCY (% TYPICAL) –400 0.2 0 –500 0 0 0.1 0.2 0.3 0.4 0.5 0.6 –400 –300 –200 –100 0 100 200 300 400 –50 –25 0 25 50 75 100 125 FEEDBACK PIN VOLTAGE (V) FEEDBACK PIN VOLTAGE FROM NOMINAL (mV) TEMPERATURE (°C) 1533 G07 1533 G08 1533 G09 4