MC34167, MC33167 5.0 A, StepâUp/Down/ Inverting ... - RFPhone

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MC34167, MC33167 V in 12 V + PWM Oscillator S R Q ILIMIT UVLO 4 Q 1 + 2 C in 330 L 190 H Thermal D 1 1N5825 3 5 + Reference EA + 1 R 1 2.4 k C 1 + V O −12 V/1.7 A C O 4700 0.47 C F R F R 2 4.7 k 3.3 k 0.047 Test Conditions Results Line Regulation V in = 10 V to 24 V, I O = 1.7 A 15 mV = ± 0.61% Load Regulation V in = 12 V, I O = 0.1 A to 1.7 A 4.0 mV = ± 0.020% Output Ripple V in = 12 V, I O = 1.7 A 78 mV pp Short Circuit Current V in = 12 V, R L = 0.1 5.7 A Efficiency V in = 12 V, I O = 1.7 A V in = 24 V, I O = 1.7 A 79.5% 86.2% 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. Two potential problems arise when designing the standard voltage−inverting converter with the MC34167. First, the Switch Output emitter is limited to −1.5 V with respect to the ground pin and second, the Error Amplifier’s noninverting input is internally committed to the reference and is not pinned out. Both of these problems are resolved by connecting the IC ground pin to the converter’s negative output as shown in Figure 23. This keeps the emitter of Q 1 positive with respect to the ground pin and has the effect of reversing the Error Amplifier inputs. Note that the voltage drop across R 1 is equal to 5.05 V when the output is in regulation. 3.0″ Figure 23. Voltage−Inverting Converter + + + MC34167 VOLTAGE-INVERTING 1.9″ V O − + V in + − RF R2 R1 C1 C O ÎÎÎÎÎÎ ÎÎÎÎÎÎ C in D1 L C F (Bottom View) + + ÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎ (Top View) ÎÎÎÎÎÎ Figure 24. Voltage−Inverting Converter Printed Circuit Board and Component Layout + http://onsemi.com 12
MC34167, MC33167 V in 24 V + PWM Oscillator S R Q ILIMIT UVLO 4 2 + 1000 1N5825 MUR110 + 1000 V O3 −12 V/200 mA Thermal + Reference EA + 1 6.8 k T1 + 1000 MUR110 V O1 5.0 V/3.0 A + 1000 V O2 12 V/250 mA 3 5 0.1 68 k Figure 25. Triple Output Converter Line Regulation Load Regulation Output Ripple Short Circuit Current Tests Conditions Results 5.0 V 12 V −12 V 5.0 V 12 V −12 V 5.0 V 12 V −12 V 5.0 V 12 V −12 V V in = 15 V to 30 V, I O1 = 3.0 A, I O2 = 250 mA, I O3 = 200 mA 3.0 mV = ± 0.029% 572 mV = ± 2.4% 711 mV = ± 2.9% V in = 24 V, I O1 = 30 mA to 3.0 A, I O2 = 250 mA, I O3 = 200 mA V in = 24 V, I O1 = 3.0 A, I O2 = 100 mA to 250 mA, I O3 = 200 mA V in = 24 V, I O1 = 3.0 A, I O2 = 250 mA, I O3 = 75 mA to 200 mA V in = 24 V, I O1 = 3.0 A, I O2 = 250 mA, I O3 = 200 mA V in = 24 V, R L = 0.1 1.0 mV = ± 0.009% 409 mV = ±1.5% 528 mV = ± 2.0% 75 mV pp 20 mV pp 20 mV pp 6.5 A 2.7 A 2.2 A Efficiency TOTAL V in = 24 V, I O1 = 3.0 A, I O2 = 250 mA, I O3 = 200 mA 84.2% T1 = Primary: Coilcraft M1496−A or General Magnetics Technology GMT−0223, 42 turns of #16 AWG on Magnetics Inc. 58350−A2 core. T1 = Secondary: V O2 − 69 turns of #26 AWG T1 = Secondary: V O3 − 104 turns of #28 AWG Heatsink = AAVID Engineering Inc. 5903B, or 5930B. Multiple auxiliary outputs can easily be derived by winding secondaries on the main output inductor to form a transformer. The secondaries must be connected so that the energy is delivered to the auxiliary outputs when the Switch Output turns off. During the OFF time, the voltage across the primary winding is regulated by the feedback loop, yielding a constant Volts/Turn ratio. The number of turns for any given secondary voltage can be calculated by the following equation: # TURNS(SEC) V O(SEC) VF(SEC) V O(PRI)VF(PRI) #TURNS(PRI) Note that the 12 V winding is stacked on top of the 5.0 V output. This reduces the number of secondary turns and improves lead regulation. For best auxiliary regulation, the auxiliary outputs should be less than 33% of the total output power. http://onsemi.com 13
Page 1 and 2: MC34167, MC33167 5.0 A, Step−Up/D
Page 3 and 4: MC34167, MC33167 ELECTRICAL CHARACT
Page 5 and 6: MC34167, MC33167 Vsat, SWITCH OUTPU
Page 7 and 8: MC34167, MC33167 INTRODUCTION The M
Page 9 and 10: MC34167, MC33167 1 + 100 A Error Am
Page 11: MC34167, MC33167 V in 12 V + PWM Os
Page 15 and 16: MC34167, MC33167 0.001 T1 MBR20100C
Page 17 and 18: MC34167, MC33167 Device MC33167D2T
Page 19 and 20: MC34167, MC33167 PACKAGE DIMENSIONS
Page 21: This datasheet has been download fr

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MC34167, MC33167 5.0 A, StepâUp/Down/ Inverting ... - RFPhone