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MC34167TV Datasheet(PDF) 10 Page - ON Semiconductor |
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MC34167TV Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 20 page MC34167, MC33167 http://onsemi.com 10 4 2 1 5 3 + CF RF R1 CO 4700 VO 5.05 V/5.0 A R2 EA Reference Thermal Oscillator S R Q PWM UVLO ILIMIT Vin 12 V Cin 330 + 6.8 k 68 k 0.1 Q1 D1 1N5825 L 190 mH + + + Test Conditions Results Line Regulation Vin = 10 V to 36 V, IO = 5.0 A 4.0 mV = ± 0.039% Load Regulation Vin = 12 V, IO = 0.25 A to 5.0 A 1.0 mV = ± 0.01% Output Ripple Vin = 12 V, IO = 5.0 A 20 mVpp Short Circuit Current Vin = 12 V, RL = 0.1 W 6.5 A Efficiency Vin = 12 V, IO = 5.0 A Vin = 24 V, IO = 5.0 A 78.9% 82.6% L = Coilcraft M1496−A or General Magnetics Technology GMT−0223, 42 turns of #16 AWG on Magnetics Inc. 58350−A2 core. Heatsink = AAVID Engineering Inc. 5903B, or 5930B. The Step−Down Converter application is shown in Figure 19. The output switch transistor Q1 interrupts the input voltage, generating a squarewave at the LCO filter input. The filter averages the squarewaves, producing a dc output voltage that can be set to any level between Vin and Vref by controlling the percent conduction time of Q1 to that of the total oscillator cycle time. If the converter design requires an output voltage greater than 5.05 V, resistor R1 must be added to form a divider network at the feedback input. Figure 19. Step−Down Converter (Top View) Vin VO CF RF R1 +− + − + + Figure 20. Step−Down Converter Printed Circuit Board and Component Layout (Bottom View) 3.0 ″ |
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