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Easy Evaluation of the SP7662ER
0 to 12A Output Synchronous Buck
Converter
Built in Low R
(
) Power FETs
DS
ON
UVLO Detects Both VCC and VIN
Highly Integrated Design, Minimal
Components
High Efficiency: up to 93%
Feature Rich: UVIN, Programmable
Soft Start, Built In VCC Supply
Output Short Circuit Protection and
Current Limiting
SP7662EB Schematic
Nov27-06
SP7662 Evaluation Board Manual
Evaluation Board Manual
© 2006 Sipex Corporation
SP7662
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Summary of Contents for Sipex SP7662
- Page 1 UVLO Detects Both VCC and VIN Highly Integrated Design, Minimal Components High Efficiency: up to 93% Feature Rich: UVIN, Programmable Soft Start, Built In VCC Supply Output Short Circuit Protection and Current Limiting SP7662EB Schematic Nov27-06 SP7662 Evaluation Board Manual © 2006 Sipex Corporation...
- Page 2 3) Using the Evaluation Board with Different Output Voltages While the SP7662 Evaluation Board has been tested and delivered with the output set to 3.30V, by simply changing one resistor, R2, the SP7662 can be set to other output voltages. The relationship in Equation 1 is based on a voltage divider from the output to the feedback pin V which is set to an internal reference voltage of 0.80V.
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Page 3: Power Supply Data
Where DCR is the Inductor winding resistance is the desired output current Further details on the current limit can be found in the SP7662 data sheet. For the Inter-Technical Inductor on this demo board DCR= 4.1mΩ nominal. POWER SUPPLY DATA The SP7662ER is designed with an very accurate 2.0% reference over line, load and... - Page 4 Figure 3. Load Step Response: 6->12A Figure 4. Load Step Response 0->12A Figure 5. Current limit set point 17A Figure 6. Output load Short Circuit Figure 7. Startup into full load Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation Page 4 of 11...
- Page 5 Type III compensation circuit is required to give a phase boost of 180° in order to counteract the effects of the output LC underdamped resonance double pole frequency. Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation Page 5 of 11...
- Page 6 Select L = 2.7uH => yield ≈ 25% of maximum 12A output current ripple ≈ 3mΩ) Select C = 100uF Ceramic capacitor (R fs = 300kHz SP7662 internal Oscillator Frequency = 1.0V SP7662 internal Ramp Peak-to-Peak Amplitude RAMP Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation...
- Page 7 R1 = 10kΩ, 1% Calculate R2 based on the desired V Vout − Ω Ω ≈ Ω 3200 3160 − Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation Page 7 of 11...
- Page 8 π ⋅ ⋅ ≈ 2200 π ⋅ Ω ⋅ Choose 100pF ≤ CF1 ≤ 220pF to stabilize the SP7662ER internal Error Amplifier . For this example let’s select 100pF. Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation Page 8 of 11...
- Page 9 PC Layout Drawings Figure 15. SP7662EB Component Placement Figure 16. SP7662EB PC Layout Top Side Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation Page 9 of 11...
- Page 10 Figure 17. SP7662EB PC Layout 2 Layer Side Figure 18. SP7662EB PC Layout 3 Layer Side Figure 19. SP7662EB PC Layout Bottom Side Figure 20. SP7662EB PC Layout Bottom Side Components Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation Page 10 of 11...
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Page 11: Ordering Information
Table 1: SP7662EB Suggested Components and Vendor Lists ORDERING INFORMATION Model Temperature Range Package Type SP7662EB…........-40°C to +85°C....…………….SP7662 Evaluation Board SP7662ER......…. -40°C to +85°C........……26-pin DFN(option2) Feb21-07 SP7662 Evaluation Manual ©2007 Sipex Corporation Page 11 of 11...
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