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LM27403 Datasheet(PDF) 39 Page - Texas Instruments |
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LM27403 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 49 page  1 2 3 4 5 6 7 8 9 10 11 12 18 17 16 15 14 13 24 23 CBOOT HG SW LG VDD GND SS/TRACK RS FB COMP FADJ SYNC VIN GND LM27403SQ VOUT1 VIN VIN D+ D± VDD CBYP CIN CBOOT Q1 Q2 RS CS RISET RCS CCS CVIN RVIN RUV1 RUV2 RFADJ RFB2 RC1 RC2 ROTP CSS CC3 CC1 CVDD QT 2N3904 COTP DBOOT CC2 82.5 k 2.2 1 F 4.7 F 2 k 52.3 k 1.05 k 22 F L1 4.7 H 7 m 100 pF 47 pF 1.2 nF 47 nF 0.22 F 20 k 10.5 k 10.5 k 3.65 k 3 x 22 F 4.7 nF 22.1 k 2 k 0.1 F 40V 0.2A 0.1 F RFB1 20 k U1 RBOOT 10 CBULK 180 F VOUT1 = 12V GND 1 2 3 4 5 6 18 17 16 15 14 13 OUT OUT OUT(FB) SET FB GND IN IN IN(CP) CP EN GND(CP) LP38798SD-ADJ U2 CCP 10 nF RT 73.5 k RB 10 k CV2 1 F CLDO_IN 1 F VOUT1 VOUT2 = 10V LM27403 www.ti.com SNVS896 A – AUGUST 2013 – REVISED SEPTEMBER 2013 DESIGN 4 - Regulated 12-V Rail with LDO Low-Noise Auxiliary Output for RF Power The schematic diagram of a 280-kHz, 12-V output, 10-A buck regulator for RF power applications is given in Figure 45(1). A 10- Ω resistor in series with CBOOT is used to slow the turn-on transition of the high-side MOSFET, reducing the spike amplitude and ringing of the SW node waveform and minimizing the possibility of Cdv/dt- induced shoot-through of the low-side MOSFET. If needed, place an RC snubber (for example, 2.2 Ω and 1 nF) close to the SW node and GND(2). An auxiliary 10-V, 800-mA rail to power noise-sensitive circuits is available using the LP38798 ultra-low noise LDO as a post-regulator. The internal pullup of the LP38798's EN pin facilitates direct connection to the LM27403's PGOOD for sequential startup control. Figure 45. Application Circuit 4 with VIN = 13 V to 20 V (VIN(nom) = 18 V), VOUT1 = 12 V, IOUT1(max) = 10 A, FSW = 280 kHz, VOUT2 = 10 V, IOUT2(max) = 0.8 A Table 10. List of Materials for Design 4 REFERENCE QTY SPECIFICATION MANUFACTURER PART NUMBER DESIGNATOR CIN 3 22 µF, 25 V, X5R, 1210 ceramic Taiyo Yuden TMK325BJ226MM-T CBYP 1 22 µF, 16 V, X7R, 1210 ceramic Taiyo Yuden EMK325B7226MM-T CBULK 1 180 µF, 16 V, 22 m Ω, 3.3 Arms, C6, OSCON Panasonic 16SVPF180M L1 1 4.7 µH, 15 A, 7 m Ω, flat wire high current Wurth 7443551470 Q1 1 30 V, high-side MOSFET Texas Instruments CSD17309Q3 Q2 1 30 V, low-side MOSFET Infineon BSC011NE3LS Ultra-Low Noise, High PSRR LDO for RF/Analog U2 1 Texas Instruments LP38798SD-ADJ Circuits, 4-mm x 4-mm WSON-12 (1) These design examples are provided to showcase the LM27403 in numerous applications. Depending on the impedance of the input bus, an electrolytic capacitor may be required at the input to ensure stability. (2) Kam, K. W. et. al., "EMI Analysis Methods for Synchronous Buck Converter EMI Root Cause Analysis," IEEE International Symposium on Electromagnetic Compatibility, 2008. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Links: LM27403 |
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