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LT1070IT Datasheet(PDF) 6 Page - Linear Technology |
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LT1070IT Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LT1070/LT1071 TYPICAL PERFORMANCE CHARACTERISTICS voltage is obtained by using the output of a voltage sensing error amplifier to set current trip level. This technique has several advantages. First, it has immediate response to input voltage variations, unlike ordinary switchers which have notoriously poor line transient response. Second, it reduces the 90 ° phase shift at The LT1070/LT1071 is a current mode switcher. This means that switch duty cycle is directly controlled by switch current rather than by output voltage. Referring to the Block Diagram, the switch is turned “on” at the start of each oscillator cycle. It is turned “off” when switch current reaches a predetermined level. Control of output OPERATION Switch “Off” Characteristics SWITCH VOLTAGE (V) 0 600 800 1000 80 1070/71 G19 400 200 500 700 900 300 100 0 20 40 60 10 90 30 50 70 100 VSUPPLY = 3V 15V 40V 55V FREQUENCY (Hz) 1000 3000 4000 6000 7000 1k 100k 1M 10M 1070/71 G21 –1000 10k 5000 2000 0 150 90 θ 60 0 –30 210 30 120 180 gm Transconductance of Error Amplifier VC Pin Characteristics VC PIN VOLTAGE (V) 0 – 400 – 300 – 200 –100 300 100 0.5 1.0 200 0 1.5 2.0 2.5 1070/71 G20 VFB = 1.5V (CURRENT INTO VC PIN) VFB = 0.8V (CURRENT OUT OF VC PIN) TJ = 25°C BLOCK DIAGRAM – + ERROR AMP CURRENT AMP 0.02 Ω (0.04 Ω LT1071) SHUTDOWN CIRCUIT MODE SELECT 40kHz OSC LOGIC DRIVER ANTISAT 16V 5A, 75V SWITCH VIN FB VC COMP GAIN ≈ 6 0.15V 1070/71 BD 1.24V REF 2.3V REG FLYBACK ERROR AMP SWITCH OUT |
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