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1956 Datasheet(PDF) 4 Page - Linear Technology |
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1956 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 28 page  4 LT1956/LT1956-5 1956f Switch Peak Current Limit SHDN Pin Bias Current Shutdown Supply Current Lockout and Shutdown Thresholds Shutdown Supply Current Error Amplifier Transconductance FB Pin Voltage and Current Error Amplifier Transconductance Frequency Foldback TYPICAL PERFOR A CE CHARACTERISTICS DUTY CYCLE (%) 1.0 1.5 2.0 2.5 20 40 TYPICAL 60 80 1956 G01 100 0 GUARANTEED MINIMUM JUNCTION TEMPERATURE ( °C) –50 1.224 1.229 1.234 25 75 1956 G02 1.219 1.214 –25 0 50 100 125 1.209 1.204 1.5 2.0 1.0 0.5 0 VOLTAGE CURRENT JUNCTION TEMPERATURE ( °C) –50 250 200 150 100 12 6 0 25 75 1956 G03 –25 0 50 100 125 CURRENT REQUIRED TO FORCE SHUTDOWN (FLOWS OUT OF PIN). AFTER SHUTDOWN, CURRENT DROPS TO A FEW µA AT 2.38V STANDBY THRESHOLD (CURRENT FLOWS OUT OF PIN) JUNCTION TEMPERATURE ( °C) –50 50 100 1956 G04 0 25 75 2.4 2.0 1.6 1.2 0.8 0.4 0 –25 125 LOCKOUT START-UP SHUTDOWN INPUT VOLTAGE (V) 0 1956 G05 10 20 30 40 50 60 40 35 30 25 20 15 10 5 0 VSHDN = 0V SHUTDOWN VOLTAGE (V) 0 0 50 100 150 200 250 300 0.1 0.2 0.3 0.4 1956 G06 0.5 VIN = 60V VIN = 15V JUNCTION TEMPERATURE 1956 G07 2500 2000 1500 1000 500 0 –50 50 100 0 25 75 –25 125 FREQUENCY (Hz) 3000 2500 2000 1500 1000 500 200 150 100 50 0 –50 100 10k 100k 10M 1956 G08 1k 1M GAIN PHASE ERROR AMPLIFIER EQUIVALENT CIRCUIT ROUT 200k COUT 12pF VC RLOAD = 50Ω VFB 2 • 10 –3 ) ( VFB (V) 0 0.2 375 500 625 1.0 1956 G09 250 125 0 0.4 0.6 0.8 1.2 SWITCHING FREQUENCY FB PIN CURRENT |
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