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MC34129D Datasheet(PDF) 11 Page - Motorola, Inc |
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MC34129D Datasheet(HTML) 11 Page - Motorola, Inc |
11 / 16 page MC34129 MC33129 11 MOTOROLA ANALOG IC DEVICE DATA Figure 20. External Duty Cycle Clamp and Multi–Unit Synchronization Figure 21. Bootstrap Startup Figure 22. Discrete Step Reduction of Clamp Level Figure 23. Adjustable Reduction of Clamp Level – The external 9.1 V zener is required when driving low threshold MOSFETs. CSoft–Start 12 7 6 5 4 2.5V OSC R S Q 1.25V 13 14 9.1 V 8 9 10 11 1 2 3 Q2 Vin – + – + + – + – + – + + Ipk(max) = 1.675 – (VF(D1) + VF(D2)) 275mV R S Q – 1.25V 8 9 10 11 1 2 3 Vin Q1 RS D1 D2 ≈ 120µA + + + – RS 275mV R S Q – 1.25V 8 9 10 11 1 2 3 Vin Q1 RS R1 R2 + + + – If: 1.25 V R1 + R2 ≥ 1.0 mA Then: Ipk(max) ≈ 1.25 R2 R1 + 1 – 0.275 RS f = 1.44 (RA + 2RB)C Dmax = RB 5.0V RA RB – 8 6 5 2 C 5.0k 4 R Q S MC1455 3 7 6 5 4 2.5V OSC To Additional MC34129’s + 5.0k 5.0k 1 – + – + RA + 2RB Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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