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demo board for SP6128A, a synchronous buck controller
Non-Isolated DC-DC SIP Modules: 3.0Vdc-5.5Vdc In, 0.9Vdc-3.3Vdc out, 10A
FEATURES:
High Efficiency: 94.5% at 3.3V output,10A Small size and very low profile 43.2mm x 7.25mm x 13.97mm (1.7in x 0.285in x 0.55in) 3V to 5.5V input voltage All ceramic capacitors design Negative or Positive remote On/Off Thermal shut down protection Low output ripple max 20mV Output voltage adjustable with the trim function Low EMI noise Short circuit and over current protection using Hiccup mode and auto-restart Build in UVLO function Wide operation temperature range -40 C to +85 C
*
0.1% line regulation & 0.3% load
regulation -40 C to +85 C
DESCRIPTION:
The SP6128A demo board design is non-isolated dc-dc SIP module with a very high efficiency at 10A output. It has smallest size comparing with the current market products with the same power range and low EMI. Standard features include remote ON/OFF with the customer selectable positive and negative control, output voltage adjustment, soft start, over current and over temperature protection. This demo board proves that SP6128A is a high performance, but yet easy to use synchronous buck controller. It simplifies low voltage DC to DC power supply designs without compromising performance.
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APPLICATION
* * * * * * * workstations, servers computer and its peripheral distribution power architecture telecommunications equipment data processing and storage equipment LANs and WANs high performance data processing IC
SCHEMATIC:
PCB Layout: 2
Top Layer
Internal-1 layer
Internal-2 layer
Bottom Layer
3
SST
SSB
CHARACTERISTIC CURVE (1.8V output)
SP6128A EVAL Board Eff
95 94
SP6128A EVAL Board regulation 1.816 1.814 Output(V) 1.812 1.81 1.808 1.806 1.804 1.802
3.3V 5V
93
EFF (%)
92 91 90 89 88 0 1 2 3 4 5
Load (A)
3.3V 5V
6
7
8
9
10
0
1
2
3
4
5 6 Load(A)
7
8
9
10
Figure 1
Figure 2
Figure 3: input ripple @ Vin=3.3V, Io=10A
Figure 4: input ripple @ Vin=5V, Io=10A
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Figure 5:output ripple @ Vin=3.3V Io=10A
Figure 6:output ripple @ Vin=5V Io=10A
Figure 7: startup, Ch1:Vin, Ch2:Vout, Ch3:Iin 2A/div @Io=10A
Figure 8 startup, Ch1:Vin, Ch2:Vout, Ch3:Iin 2A/div @Io=10A
Figure 9: output short, Ch2: COM Ch4:Iin 5A/div@Vin=3.0V
Figure 10: output short, Ch2: COM Ch4:Iin 5A/div@Vin=5.0V
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Figure11: transient response, Ch1:Vout Ch2:Iout 2A/div load change At 5A/us from 0.4A to 5A @ Vin=3.3V
Figure12: transient response, Ch1:Vout Ch2:Iout 2A/div load change At 5A/us from 0.4A to 5A @ Vin=5V
Figure13: short circuit Iin RMS value Ch2: Vin, Ch4 Iin 2A/div
Figure14: short circuit Iin RMS value Ch2: Vin, Ch4 Iin 2A/div
*short circuit protection tested at with Cin=100uF, Tantalum
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ELECTRICAL SPECIFICATIONS Parameter
Operating input voltage Input voltage ripple Output voltage set point accurate Output regulation Line regulation Load regulation Output ripple&noise Output current Output current limit point Over temperature protection Negative remote control: Logic low-module on Logic high-module off Positive remote control: Logic high-module on Logic low-module off Turn-on time Short circuit input current(RMS) Output voltage trim range
Symbol
Vin Vinripple
Min
2.9
Typ
250
Max
6 300 1.5
Units
Vdc mVp-p % % % mVp-p A A
0.1 0.3
15 Io 110 Vrem Irem Vrem Irem Vrem Irem Vrem Irem -0.7 25 10 16 120 0.3 100 2.4 0.5 1 0.8 1 5 0.5 +10
C
V
A
V mA V mA V A ms A % Vout ,nom
2.4 -0.7
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FEATURE DISCRIPTION Output voltage trim function:
In this design,there is a trim pin that allows the customer to trim the output voltage to 10% off the nominal voltage. In the schematic on page 2, R3, R14, R2 and external trim resistor (Rtrim) comprise the trim function circuit. To trim-up, connect Rtrim between trim pin and GND. The Rtrim value is equal to: Rtrim=
0 .8 x R 2 - R14 V
To trim-down, connect Rtrim between trim pin and Vout. The Rtrim value can be derived from: Rtrim=
0.8 x R2 - R2 - R14 R3 x V
2
Remote On/OFF: 7
This design allows user to select positive or negative logic remote control. This demo board only implements the negative logic remote control circuit. To change to positive logic, remove Q5, R7, R8, and R12.and add D2 andD3.
Over temperature protection:
The over temperature protection will shut down the module when abnormal high temperature is detected by the circuit.. The module will attempt to restart once the temperature cools down. The temperature set point can be adjusted by resistor R11.
Mechanical Outline Diagram Dimensions are in millimeter (inch)
43.2(1.7) 7.25(0.285) 13.95(5.5) 1234 567 89
IN 1 2 3 4 5 6 7 8 9
*the pin out is not the same as standard
FUNCTION Vo Vo GND GND GND ON/OFF Trim Vi Vi
BILL MATERIAL 8
Item 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 22
Quantity
Reference 2 C1,C2 3 C3,C8,C13 3 C4,C5,C6 1 C9 1 C10 2 C11,C12 1 C14 1 D1 1 D4
Part 22u 1u 47u 470p 22p 0.1u 6.8n MBR0530 STPS2L25U
Manufacture information TDK C3225X5R1A226M TDK C2012X7R1C105K TDK C3225X5R0J476M TDK C1608C0G1H471J TDK C1608C0G1H220J TDK C1608X7R1H104K TDK C1608X7R1H682K ON semiconductor ST
9 J1,J2,J3,J4,J5,J6,J7 PIN ,J8,J9 1 L1 SC5018-1R2M 2 Q1,Q2 1 R1 1 R2 1 R3 1 R5 1 R6 1 R13 1 R14 1 U1 1 R11 4 R7,R8,R10,R12 2 Q3,Q4 1 Q5 1 R9 IRF7811W 300 10.2k 8k 20k 4.22k 0 45k SP6128A 100 10K MMBT4401 MMBT2907 NTC-100K
Easy Magnetic IRF 0603 0603 0603 0603 0603 0603 0603 SIPEX 0603 0603 ON semiconductor ON semiconductor TDK NTCG204CH104J
For the low profile application, SC5015-1R2M from Easy magnetic recommended for L1
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EFFICIENCY ON THE DIFFERENT OUTPUT VOLTAGE
Input voltage 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 4.5-5.5V
Output voltage 0.9V 1V 1.2V 1.5V 1.8V 2.0V 2.5V 3.3V
Output current 10A 10A 10A 10A 10A 10A 10A 10A
Efficiency 82% 84% 86% 88% 90.5% 90.5% 92.7% 94.5%
Internal Trim resistor 80.6K 40.2K 20.5K 11.8K 8.06K 6.81K 4.75K 3.24K
SIGNAL PROCESSING EXCELLENCE
Headquarters and sales office 22 Linnell Circle Billerica,MA 01821 TEL:978-667-8700 FAX:978-670-9001 E-mail: sales@sipex.com Sales office 233 South Hillview Drive Milpitas,CA 95035 TEL:408-934-7500 FAX:408-935-7600 Application support Jack Ni TEL:978-671-4644 Email: jni@sipex.com
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