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LT1249C Datasheet(PDF) 5 Page - Linear Technology |
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LT1249C Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page LT1249 5 PIN FUNCTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEMPERATURE ( °C) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1249 G11 75 –25 25 125 –50 0 50 100 Synchronization Threshold at CAOUT Voltage Amp Sink Current Limits (Threshold) MOUT VOLTAGE (V) –2.4 –1.2 0 1.2 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 1249 G12 1.2 2.4 125 °C 25 °C –50 °C MOUT Pin Characteristics TEMPERATURE ( °C) 1249 G15 –1.30 –1.25 –1.20 –1.15 –1.10 –1.05 –1.00 –0.95 –0.90 –75 –25 –50 25 0 50 100 75 125 Maximum Multiplier Output Voltage (IM(MAX) • RMOUT) Transconductance of Current Amplifier Over Temperature TEMPERATURE ( °C) –50 100 1249 G13 050 400 350 300 250 200 150 100 50 0 –25 25 75 125 Maximum Duty Cycle TEMPERATURE ( °C) 100 99 98 97 96 95 94 93 92 91 90 1249 G16 75 –25 25 125 –50 0 50 100 TEMPERATURE ( °C) –75 –25 –50 25 0 50 100 75 125 1249 G14 60 50 40 30 20 10 0 UP THRESHOLD DOWN THRESHOLD NOTE: THESE SINK CURRENT THRESHOLDS ARE FOR OVERVOLTAGE PROTECTION FUNCTION. GND (Pin 1): Ground. CAOUT (Pin 2): This is the output of the current amplifier that senses and forces the line current to follow the reference signal that comes from the multiplier by com- manding the pulse width modulator. When CAOUT is low, the modulator has zero duty cycle. MOUT (Pin 3): The multiplier current goes out of this pin through the 4k resistor RMOUT. The voltage developed across RMOUT is the reference voltage of the current loop and it is limited to 1.1V. The noninverting input of the current amplifier is also tied to RMOUT. In operation, MOUT is normally at negative potential and only AC signals appear at the noninverting input of the current amplifier. IAC (Pin 4): This is the AC line voltage sensing input to the multiplier. It is a current input that is biased at 2V to minimize the crossover dead zone caused by low line voltage. A 32k resistor is in series with the current input, so that a small external capacitor can be used to filter out the switching noise from the high impedance lines. VAOUT (Pin 5): This is the output of the voltage error amplifier. The output is clamped at 12V. When the output goes below 1.5V, the multiplier output current is zero. |
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