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LM5017 Datasheet(PDF) 13 Page - Texas Instruments |
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LM5017 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 19 page  + + + + VIN BST RON RTN SW VCC FB UVLO VIN VOUT1 VOUT2 RFB1 RUV1 RON COUT1 CBST D1 CIN COUT2 RFB2 RUV2 X1 Rr NP NS LM5017 CVCC + D2 20V-100V Cr Cac NS VOUT2 = VOUT1 x NP - VF + + + VIN BST RON RTN SW VCC FB VIN VOUT R2 R7 R3 C9 C1 C4 R1 R5 L1 UVLO C7 LM5017 12V-95V 1 2 3 4 5 6 8 7 (TP4) + C5 2.2 F 0.47 F 127 NŸ 14 NŸ 499 NŸ GND (TP1) (TP2) UVLO/SD U1 R6 (TP3) (TP5) GND R4 C6 C8 + D2 R8 EXP 0 Ÿ 1 NŸ 6.98 NŸ 22 F 0 Ÿ 220 H 0.01 F 1 F 3300 pF 0.1 F 46.4 NŸ (TP6) SW 30177733 RUV2 VIN (UVLO,rising) = 1.225V x RUV1 + 1 ( ) VIN(HYS) = IHYS x RUV2 LM5017 www.ti.com SNVS783D – JANUARY 2012 – REVISED MAY 2013 UVLO Resistors: The UVLO resistors RFB1 and RFB2 set the UVLO threshold and hysteresis according to the following relationship: and where IHYS = 20μA. Setting UVLO hysteresis of 2.5V and UVLO rising threshold of 12V results in RUV1 = 14.53kΩ and RUV2 = 125kΩ. Selecting standard value of RUV1 = 14kΩ and RUV2 = 125kΩ results in UVLO thresholds and hysteresis of 12.4V and 2.5V respectively. APPLICATION CIRCUIT: 12V TO 95V INPUT AND 10V, 500mA OUTPUT BUCK CONVERTER The application schematic of a buck supply is shown in Figure 16 below. For output voltage (VOUT) above the maximum regulation threshold of VCC (8.55V, see Electrical Characteristics), the VCC pin can be connected to VOUT through a diode (D2), as shown below, for higher efficiency and lower power dissipation in the IC. Figure 16. Final Schematic for 12V to 95V Input, and 10V, 500mA Output Buck Converter ISOLATED DC-DC CONVERTER USING LM5017 An isolated supply using LM5017 is shown in Figure 17 below. Inductor (L) in a typical buck circuit is replaced with a coupled inductor (X1). A diode (D1) is used to rectify the voltage on a secondary output. The nominal voltage at the secondary output (VOUT2) is given by: where VF is the forward voltage drop of D1, and NP, NS are the number of turns on the primary and secondary of coupled inductor X1. For output voltage (VOUT1) above the maximum VCC (8.55V), the VCC pin can be diode connected to VOUT1 for higher effiicency and low dissipation in the IC. See AN-2204 (SNVA611) for a complete isolated bias design with LM5017. Figure 17. Typical Isolated Application Schematic Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: LM5017 |
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