lr745 Supertex, Inc., lr745 Datasheet
lr745
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lr745 Summary of contents
Page 1
... After start-up, the internal high voltage line is discon- nected from the IC thereby reducing the continuous power dissipation to a minimum. Pin Configuration 450V 25V –55°C to 150°C 300°C TO-92 TO-243AA 1 LR745 Product marking for TO-243AA: LR7 = 2-week alpha date code voltage below their start threshold CC TAB TO-243AA ...
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... Clock comp2 Clk – 2 Unit Conditions OUT -40°C to +85°C OUT µ 400V OUT -40°C to +85° -40°C to +85°C A µ 400V IN V µ 22V AUX OUT LR745 ...
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... PWM its operating condition CC voltage decrease. When CC voltage of typically 10V necessary to AUX storage capacitor, C1, such that V CC decreases to 10V. This CC to supply the required operating current for the PWM IC. AUX (Continued on page 14-9) LR745 line of a PWM CC CC increases to AUX ...
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... Stage I 16.0 V OUT 13.5 (Volts) 12.0 8.0 4.0 0.0 3 2.0 (mA) 1.0 0.0 12.0 8.0 V AUX (Volts) 4.0 0.0 30.0 20.0 I AUX (mA) 10.0 0.0 Figure 2 LR7 Start-up Waveforms Stage II PWM IC Start Threshold Voltage LR7 V 4 Stage III Trip Point OFF Auxiliary Supply Powers PMW IC t ≈ 0mA 12V AUX 20mA AUX t LR745 ...
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... Once V CC REF voltage to decrease. The V CC PWM IC UC3844 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 • FAX: (408) 222-4895 www.supertex.com LR745 , must OUT REF reaches CC will increase from voltage of 11V OUT without having OUT ...