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LT1171HV Datasheet(PDF) 5 Page - Linear Technology |
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LT1171HV Datasheet(HTML) 5 Page - Linear Technology |
5 / 20 page 5 LT1170/LT1171/LT1172 INPUT VOLTAGE (V) 0 10 20 30 40 1170/1/2 G09 50 15 14 13 12 11 10 9 8 7 6 5 60 TJ = 25°C NOTE THAT THIS CURRENT DOES NOT INCLUDE DRIVER CURRENT, WHICH IS A FUNCTION OF LOAD CURRENT AND DUTY CYCLE. 90% DUTY CYCLE 50% DUTY CYCLE 10% DUTY CYCLE 0% DUTY CYCLE * UNDER VERY LOW OUTPUT CURRENT CONDITIONS, DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH 10% OR LESS. Supply Current vs Input Voltage* VC PIN VOLTAGE (mV) 0 200 180 160 140 120 100 80 60 40 20 0 40 1170/1/2 G10 10 20 30 50 60 70 80 90 100 TJ = 150°C –55 °C ≤ TJ ≤ 125°C Shutdown Mode Supply Current TEMPERATURE ( °C) 5000 4500 4000 3500 3000 2500 2000 1500 1000 500 0 1170/1/2 G11 –75 –25 25 50 150 –50 0 75 100 125 gm = ∆I (VC PIN) ∆V (FB PIN) Error Amplifier Transconductance VC Pin Characteristics SUPPLY VOLTAGE (V) 0 10 20 30 40 160 140 120 100 80 60 40 20 0 50 60 1170/1/2 G07 VC = 50mV VC = 0V TJ = 25°C Supply Current vs Supply Voltage (Shutdown Mode) Driver Current* vs Switch Current SWITCH CURRENT (A) 0 12 3 160 140 120 100 80 60 40 20 0 4 5 1170/1/2 G08 TJ = –55°C TJ = ≥ 25°C * AVERAGE LT1170 POWER SUPPLY CURRENT IS FOUND BY MULTIPLYING DRIVER CURRENT BY DUTY CYCLE, THEN ADDING QUIESCENT CURRENT. VC PIN VOLTAGE (V) 300 200 100 0 –100 –200 –300 –400 1170/1/2 G12 0 2.0 0.5 1.0 1.5 2.5 VFB = 1.5V (CURRENT INTO VC PIN) VFB = 0.8V (CURRENT OUT OF VC PIN) TJ = 25°C Reference Voltage vs Temperature INPUT VOLTAGE (V) 0 10 20 30 40 1170/1/2 G04 50 5 4 3 2 1 0 –1 –2 –3 –4 –5 60 TJ = 150°C TJ = –55°C TJ = 25°C Line Regulation TEMPERATURE ( °C) 1170/1/2 G05 1.250 1.248 1.246 1.244 1.242 1.240 1.238 1.236 1.234 –75 –25 25 50 150 –50 0 75 100 125 TEMPERATURE ( °C) 1170/1/2 G06 800 700 600 500 400 300 200 100 0 –75 –25 25 50 150 –50 0 75 100 125 Feedback Bias Current vs Temperature TYPICAL PERFOR A CE CHARACTERISTICS |
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