MC34129D Freescale Semiconductor, MC34129D Datasheet
MC34129D
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MC34129D Summary of contents
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... Lockout 8 1.25V V ref 1.25V Reference Error Amp Noninverting 9 Input + 10 – Inverting Input Device 11 Feedback/ PWM Input MC34129D 1 Drive Out MC34129P 2 Drive Gnd MC33129D 3 Ramp Input MC33129P Motorola, Inc. 1996 Go to: www.freescale.com Order this document by MC34129/D MC34129 MC33129 CURRENT MODE CONTROLLERS SEMICONDUCTOR ...
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... Freescale Semiconductor, Inc. MAXIMUM RATINGS Rating V CC Zener Current Start/Run Output Zener Current Analog Inputs (Pins 10, 11, 12) Sync Input Voltage Drive Output Current, Source or Sink Current, Reference Outputs (Pins 6, 8) Power Dissipation and Thermal Characteristics D Suffix, Plastic Package Case 751A Maximum Power Dissipation @ Thermal Resistance, Junction– ...
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... Freescale Semiconductor, Inc. ELECTRICAL CHARACTERISTICS ( [Note 1], unless otherwise noted.) Characteristics PWM COMPARATOR Input Offset Voltage ( 1.25 V) Input Bias Current Propagation Delay, Ramp Input to Drive Output SOFT–START Capacitor Charge Current (Pin Buffer Input Offset Voltage ( 1.25 V) Buffer Output Voltage (I Sink = 100 A) ...
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... Freescale Semiconductor, Inc. Figure 1. Timing Resistor versus Oscillator Frequency 1.0 M 500 k 200 k 100 5.0 nF 2.0 nF 1.0 nF 500 5 100 f OSC , OSCILLATOR FREQUENCY (kHz) Figure 3. Oscillator Frequency Change versus Temperature 8.0 4.0 0 –4.0 –8.0 –55 – AMBIENT TEMPERATURE ( C) Figure 5. Error Amp Small–Signal Transient Response 1 ...
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... Freescale Semiconductor, Inc. Figure 7. Error Amp Open Loop DC Gain versus Load Resistance OUTPUT LOAD RESISTANCE (k ) Figure 9. Soft–Start Buffer Output Saturation versus Sink Current 1 Pins 0.8 Pins 10 Gnd 0.6 0.4 0 100 200 300 I Sink , OUTPUT SINK CURRENT ( A) Figure 11. 1.25 V Reference Output Voltage ...
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... Freescale Semiconductor, Inc. Figure 13. 1.25 V Reference Output Voltage versus Temperature *V ref = 1.225 V *V ref = 1.250 V 0 –2.0 –4.0 –6 –8.0 *V ref –10 –55 – AMBIENT TEMPERATURE ( C) Figure 15. Drive Output Saturation versus Load Current –1.0 –2.0 Source Saturation (Load to Ground) –3.0 3.0 ...
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... Freescale Semiconductor, Inc. Pin Function 1 Drive Output 2 Drive Ground 3 Ramp Input 4 Sync/Inhibit Input ref 2. Ground 8 V ref 1. Error Amp Noninverting Input 10 Error Amp Inverting Input 11 Feedback/PWM Input 12 C Soft–Start 13 Start/Run Output For More Information On This Product, MOTOROLA ANALOG IC DEVICE DATA ...
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... Freescale Semiconductor, Inc. The MC34129 series are high performance current mode switching regulator controllers specifically designed for use in low power telecommunication applications. Implementation will allow remote digital telephones and terminals to shed their power cords and derive operating power directly from the twisted pair used for data transmission. Although these ...
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... Freescale Semiconductor, Inc. Figure 18. Representative Block Diagram Fault Timer Soft–Start 7 2.5V Reference 6 + 1.25V – Oscillator Sync/Inhibit Input 32k Sync/Inhibit Input Capacitor C T Latch “Set” Input Feedback/PWM Input Ramp Input Latch “Reset” Input Drive Output 20 V Start/Run Output 14 ...
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... Freescale Semiconductor, Inc. Fault Timer This unique circuit prevents sustained operating in a lockout condition. This can occur with conventional switching control ICs when operating from a power source with a high series impedance. If the power required by the load is greater than that available from the source, the input voltage will collapse, causing the lockout condition ...
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... Freescale Semiconductor, Inc. Figure 20. External Duty Cycle Clamp and Multi–Unit Synchronization 5. 5. – 5. – MC1455 5. 1. max = ( Figure 22. Discrete Step Reduction of Clamp Level 1.25V + + + 275mV – – 1.675 – (V F(D1 F(D2 pk(max For More Information On This Product, MOTOROLA ANALOG IC DEVICE DATA MC34129 MC33129 Figure 21 ...
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... Freescale Semiconductor, Inc. Figure 24. Current Sensing Power MOSFET 1.25V If: SENSEFET = MTP10N10M 200 + – Then 0.075 SENSEFET Power Ground: To Input Source Return R S 1/4W Control Circuitry Ground: To Pin 7 Virtually lossless current sensing can be achieved with the implementation of a SENSEFET power switch. Figure 26. MOSFET Parasitic Oscillations ...
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... Freescale Semiconductor, Inc. Figure 28. Non–Isolated 725 mW Flyback Regulator – 24k 5 OSC 470pF 4 128kHz Sync Test Line Regulation 5 out 5 125 mA, I out –5 Load Regulation 5 out 5 150 mA, I out –5 Output Ripple 5 out 5 125 mA, I out –5 Efficiency out 5 125 mA, I out –5 ...
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... Freescale Semiconductor, Inc. Figure 29. Isolated 2.0 W Flyback Regulator 12 0 2.5V + – 24k 5 OSC 470pF 4 128kHz Sync 100pF 100 2.7k 0 10k MOC5007 Test Line Regulation 5 out 5 380 mA, I out –5 Load Regulation 5 out 5 100 mA to 380 mA, I out –5 Output Ripple 5 out 5 380 mA, I out – ...
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... Freescale Semiconductor, Inc. Figure 30. Isolated 3.0 W Flyback Regulator with Secondary Side Sensing 12 0 2.5V + – 5 OSC 4 1/2 4N26 Test Line Regulation 8 out 600 mA Load Regulation out = 100 mA to 600 mA Output Ripple out = 600 mA Efficiency out = 600 mA An economical method of achieving secondary sensing is to combine the TL431A with a 4N26 optocoupler. ...
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... Freescale Semiconductor, Inc SEATING PLANE –A– –B– –T– K SEATING PLANE 0.25 (0.010 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “ ...