KA3846 Fairchild Semiconductor, KA3846 Datasheet
KA3846
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KA3846 Summary of contents
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... Operation Internal Block Diagram ©2000 Fairchild Semiconductor International Description The KA3846 control IC provides all of the necessary fea- tures to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response char- acteristics, and a simpler, easier-to-design control loop ...
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... KA3846 Absolute Maximum Ratings Parameter Supply Voltage Collector Supply Voltage Output Current, Sink of Source (Peak) Reference Output Current Soft Start Sink Current Sync Output Current Error Amplifier Output Current Oscillator Changing Current Power Dissipation ( Operating Temperature Storage Temperature Lead Temperature (Soldering, 10sec) ...
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... Pin 7 open BIAS 0.5V, Pin 7 open Min. Typ. Max 3.9 4.35 - 2 0 105 CM 0.7 1.0 = 40V 75 100 CC 80 105 = 2. -0.4 -0.5 4.3 4.6 - 0.7 2.5 2.75 1.1 1 -2.5 - 0.08 - 200 KA3846 Unit 47 KHz 2 2 250 MHz - 3 - 500 ns 3 ...
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... KA3846 Electrical Characteristics (V =15V unless otherwise specified Parameter CURRENT LIMIT ADJUST SECTION Current Limit Offset Voltage (Note 1) Input Bias Current SHUTDOWN TERMINAL SECTION Threshold Voltage Input Voltage Range Minimum Latching Current (Note 4) Maximum Non-Latching Current (Note 5) I UNDER-VOLTAGE LOCKOUT SECTION Start Threshold ...
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... Output deadtime is determined by the external capacitor, C For large values (us) = l45C T d 2.2 by the formula: f KHz = ----------------------------------------- - OUTPUT DEADTIME(T Figure 1. KA3846 Oscillator Circuit , according to the formula: T (uF) Oscillator frequency is approximately Figure 2. Error Amplifier Output Configuration ) 145C F T KA3846 12 --------------------------------- - 3.6 12 – -------------------- - ...
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... KA3846 A small PC filter may be required in some applications to reduce switch transients Differential input allows remote, noise free sensing. 6 Figure 3. Parallel Operation Figure 4. Pulse By Pulse Current Limiting Figure 5. Current Sense Amp Connections ...
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... Mechanical Dimensions Package 6.40 0.20 0.252 0.008 #1 #8 7.62 0.300 16-DIP #16 #9 3.25 0.20 0.128 0.008 5.08 MAX 0.200 0.38 MIN 0.014 3.30 0.30 0.130 0.012 KA3846 7 ...
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... KA3846 Ordering Information Product Number Package KA3846 16 DIP 8 Operating Temperature ...
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... KA3846 9 ...
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... KA3846 LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, ...