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FAN5037M Fiches technique(PDF) 6 Page - Fairchild Semiconductor |
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FAN5037M Fiches technique(HTML) 6 Page - Fairchild Semiconductor |
6 / 11 page FAN5037 PRODUCT SPECIFICATION 6 REV. 1.0.3 9/26/01 Table1. Bill of Materials for a FAN5037 3.3V, 13A Application Qty. Reference Manufacturer Part Order # Description Requirements and Comments 3 C1, C7-8 Any 100nF, 25V Capacitor 3 C2-4 Sanyo 10MV1200GX 1200µF, 10V Aluminum Capacitor IRMS = 2A , See Equation (2) in Applications 1 C5 Any 1µF, 25V Capacitor 1 C6 Any 180pF, 50V Capacitor C0G 6 C9-14 Sanyo 6MV1500GX 1500µF, 6.3V Aluminum Capacitor ESR = 44m Ω 1 R1 Any 47.5 Ω 1 R2 Any 4.75 Ω 1 R3 N/A 5.2m Ω, 1W Resistor PCB Trace Resistor, see Equation (3) Applications 1 R4 Any 3.48K Ω 1 R5 Any 2K Ω 1 D1 Motorola MBRB1545CT 15A, 45V Schottky 1 D2 Fairchild MMBD4148 Signal Diode 1 D3 Motorola 1N4735A 6.2V Zener 1 Q1 Fairchild FDB6030L 30V, 14m Ω Logic Level MOSFET Optional L1 Any 2.5µH Inductor ISAT > 8A 1 L2 Any 4.7µH Inductor ISAT > 13A 1 U1 Fairchild FAN5037M PWM Controller Application Information The FAN5037 contains a precision trimmed zero TC voltage reference, a constant-on-time architecture controller, a high current output driver, and a low offset error amp. The detailed block diagram in Figure 1 shows how the FAN5037 works together with external components to achieve a high- performance switching power supply. Switch-Mode Control Loop The main control loop for the switch-mode converter consists of a current conditioning amplifier and a voltage conditioning amplifier. The voltage amplifier compares the voltage from the internal reference with the converter’s output voltage divided by an external resistor divider. The current amplifier senses the current by comparing the voltages at the IFBH and IFBL pins, which are attached to either side of the current sense resistor. The signals from the voltage and current amplifiers are summed together, the result being used to control the off-time of the oscillator. The current feedback signal is also used as part of the FAN5037 short-circuit protection. High Current Output Drivers The FAN5037 high current output driver (DRV) contains high speed bipolar power transistors configured in a push-pull configuration. The output driver is capable of sup- plying 0.5A of current in less than 100ns. The driver’s power and ground are separated from the overall chip power and ground for added switching noise immunity. Internal Reference The reference in the FAN5037 is a precision band-gap type reference. Its temperature coefficient is trimmed to provide a near zero TC. Constant-On-Time Oscillator The FAN5037 switch-mode oscillator is designed as a fixed on-time, variable off-time oscillator. The constant-on-time oscillator consists of a comparator, an external capacitor, a fixed current source, a variable current source, and an analog switch that selects between two threshold voltages for the comparator. The external timing capacitor is alternately |
Numéro de pièce similaire - FAN5037M |
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Description similaire - FAN5037M |
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