SP6133_06 SIPEX | Alldatasheet
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Rev 3/30/06 SP6133 Evaluation Manual Copyright 2006 Sipex Corporation SP6133EB SCHEMATIC R 3 Ohm U1 SP6133 GL 1 GND 3 PGND 2 VFB 4 ISN 9 ISP 10 SWN 11 GH 12 COMP 5 EN 6 PWRGD 7 SS 8 BST 13 VIN 14 UVIN 15 VCC 16 CF1 22pF Rs3 NP Rs2 5.11K,1% 0.01uF J1 PTC36SAAN 12V 3.30V 0-10A CP1 39pF 22uF 16V EN 22uF PWRGD GND VIN VOUT GND2 DBST 10.0k,1% UVIN C3 100uF C1, C2, C3, C4 CERAMIC 1210 X5R 100uF 20.0k,1% 1) All resistors & capacitors size 0603 unless other wise specified L1 SC5018-2R7M 2.7uH, 15A, 4.1 mOhm RZ3 1k,1% 16V 6.3V R4 10.0k,1% CZ3 560pF QT Si4394DY 9.75mOhm 21 3 578 68.1k,1% 0805 BAT54WS CZ2 1,500pF CBST 0.1uF QB Si4320DY 4mOhm 21 3 578 RZ2 23.2K,1% 6.3V Notes: GND3 VCC 21.5k,1% 6.8nF CSS 47nF Rs1 5.11K,1% Cs 0.1uF CVCC 10uF /square4 Easy Evaluation for the SP6133ER1 12V Input, 0 to 10A Output Synchronous Buck Converter /square4 Precision 0.80V, ±1% High Accuracy Reference /square4 Small form factor /square4 Feature Rich: Single supply operation, Over-current protection with auto-restart, Power Good Output, Enable input, Fast transient response, Short Circuit Shutdown Protection, Programmable soft start. SP613 3 ( 10 A MAX.) Evaluation Board Manual
Figure 9. Output Noise at No Load Figure 10. Output Noise at 10A Load M O S FET M anufacturer/P art N o.
response such that its gain crosses over 0dB at a slope of –20dB/dec. capacitors but less than 1/5 of the switching frequ ency fs to insure proper operation. effects of the output LC under damped resonance double pole frequency. Figure 11. SP6133EB Voltage Mode Control Loop with Loop Dynamic
Rev 3/30/06 SP6133 Evaluation Manual Copyright 2006 Sipex Corporation Page 6 of 10 The simple guidelines for positioning the poles and zeros and for calculating the component values for Type III compensation are as follows: KR 1 .68 1 = 8.0 18 . 02 − ×= Vout RR (sets output voltage) LC RZSF CZ 11 = (sets first zero) ( )( ) Vin Vramp CZ fc Cout Lfc RZ ××× +×××= 328 . 6 128 . 62 (sets the cross-over frequency, fc) LC RZ ZSF CZ 12 = (sets second zero) 228 . 6
11 RZ fs CP ××= (sets first high-frequency pole)
328 . 6
13 CZ fs RZ ××= (sets second high-frequency pole)
Where ZSF=(f compensation double zero)/(f circuit double pole) Here ZSF is set at 0.7. As a particular example, consider for the following SP6133EB, 10A MAX with component selections for a type III Voltage Loop Compensation: Vin = 12V Vout = 3.30V @ 0 to 10A load Select L = 2.7 uH => 30% current ripple. Select Cout = 200uF 2x100uF Ceramic capacitors (Resr ≈ 2.5mΩ ) fs = 300KHz SP6133ER1 internal Oscillator Frequency Vramp_pp = 1.0V SP6133ER1 internal Ramp Peak to Peak Amplitude
Rev 3/30/06 SP6133 Evaluation Manual Copyright 2006 Sipex Corporation Page 7 of 10 Step by step design procedures : a. R2 = 21.8 Ω b. CZ3 = 487pF c. Let fc =40KHz then: d. RZ2 = 32.9k Ω e. CZ2 = 1390pF f. CP1 = 22pF g. RZ3 = 1.09K Ω h. CF1 = 22pF to stabilize SP6138ER1 internal Error Amplifier The above component values were used as a starting point for compensating the converter and after laboratory testing the values shown in circuit schematic of page 1 were used for optimum operation. Figure 12- Gain/Phase measurement of SP6133EB shown on page 1, cross-over frequency (fc) is 60KHz with a corresponding phase of 50 degrees
Rev 3/30/06 SP6133 Evaluation Manual Copyright 2006 Sipex Corporation Page 10 of 10 Table 2: SP6133EB List of Materials Line Ref. Qty. Manuf. Manuf. Layout Component Vendor No. Des. Part Number Size Phone # 1 PCB 1 Sipex 146-6587-00 1.125"X1.875" SP6133EB 978-667-7800
2 U1 1 Sipex SP6133 QFN-16 Synchronous Buck Controller 978-667-7800
3 QT 1 Vishay Semi Si4394DY SO-8 NFET 30V, 9.75mOhm 402-563-6866
4 QB 1 Vishay Semi Si4320DY SO-8 NFET 30V, 4mOhm 402-563-6866
5 DS 0 Not populated
6 DBST 1 Vishay Semi BAT54WS SOD-323 200mA-30V Schottky D iode 800-344-4539
7 L1 1 Inter-Technical SC5018-2R7M 12.6X12.6mm 2.7uH Coil , 15A, 4.10 mOhm 914-347-2474
8 C1, C2 2 TDK C4532X5R1C336M 1812 22uF Ceramic X5R 16V 978-779-3111
9 C3, C4 2 TDK C3225X5R0J107M 1210 100uF Ceramic X5R 6.3V 978-779-3111 10 C5 1 TDK C1608X7R1H103K 0603 0.01uF Ceramic X7R 50V 978-779-3111 11 C6 1 TDK C1608JB1H682K 0603 6.8nF Ceramic X5R 50V 978-779-3111 12 CBST, CS 2 TDK C1608X7R1H104K 0603 0.1uF Ceramic X7R 1 6V 978-779-3111
13 CF1 1 TDK C1608COG1H220J 0603 22pF Ceramic COG 50V 978-779-3111
14 CP1 1 TDK C1608COG1H390J 0603 39pF Ceramic COG 50V 978-779-3111
15 CSS 1 TDK C1608X7R1H473K 0603 47,000pF Ceramic X7R 50V 978-779-3111
16 CVCC 1 TDK C2012X5R0J106M 0805 10uF Ceramic X5R 6.3V 978-779-3111
17 CZ2 1 TDK C1608COG1H152J 0603 1,500pF Ceramic COG 50V 978-779-3111
18 CZ3 1 TDK C1608COG1H561J 0603 560pF Ceramic COG 50V 978-779-3111
19 R1 1 Panasonic ERJ-3EKF6812V 0603 68.1K Ohm Thick Film Res 1% 800-344-4539 20 R2 1 Panasonic ERJ-3EKF2152V 0603 21.5K Ohm Thick Film Res 1% 800-344-4539 21 R3 1 Panasonic ERJ-3EKF2002V 0603 20.0K Ohm Thick Film Res 1% 800-344-4539 22 R4,R5 2 Panasonic ERJ-3EKF1002V 0603 10.0K Ohm Thick F ilm Res 1% 800-344-4539 23 RS1, RS2 2 Panasonic ERJ-3EKF5111V 0603 5.11K Ohm Thic k Film Res 1% 800-344-4540
24 RS3 0 Not populated
25 RZ2 1 Panasonic ERJ-3EKF2322V 0603 23.2K Ohm Thick Fil m Res 1% 800-344-4539
26 RZ3 1 Panasonic ERJ-3EKF1001V 0603 1K Ohm Thick Film R es 1% 800-344-4539
27 J1 1 Sullins PTC36SAAN .32x.12 36-Pin (3x12) Header 800-344-4539 28 (J1) 1 Sullins STC02SYAN .2x.1 Shunt 800-344-4539 VIN, VOUT, VCC, GND, GND2, GND3, UVIN, PWRGD 8 Vector Electronic K24C/M .042 Dia Test Point Post 800-344-4539
ORDERING INFORMATION
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