Texas Instruments SLVU013 1.5 Schematic

Schematic

1-7

Introduction

1.5 Schematic

Figure 1–3 shows the EVM converter schematic diagram. The schematic

diagrams for the other EVM converters are identical except for the controller

IC used.

Figure 1–3. SLVP111–114 EVM Converter Schematic Diagram

IOUT

AGND2

OCP

VHYST

VREFB

VSENSE

ANAGND

SLOWST

BIAS

LODRV

LOHIB

DRVGND

LOWDR

DRV

PWRGD

NC

NC

NC

NC

NC

INHIBIT

IOUTLO

LOSENSE

HISENSE

BOOTLO

HUGHDR

BOOT

VCC

1

2

3

4

5

6

7

8

9

10

11

12

13

14 15

16

17

18

19

20

21

22

23

24

25

26

27

28

C16

1µF

C8

1µF

R15

1 M

C7

1µFR3

10Ω

Q2

Si4410

R4

10Ω

C6

0.1µF

U1

TPS5633 (See Note)

C5 0.1 µF

R2

10 kΩ

R1

1 kΩ

+C1

33µF

10 V

L1

2.2 µH

+

C2 150µF

6.3 V

+

C3 150µF

6.3 V

+

C4 150µF

6.3 V

Q1

Si4410

C9

2.2µF

R5

2.7Ω

C15

0.01µF

L2

1.5 µH

+

C10

150µF

4 V

+

C11

150µF

+

C12

150µF

+

C13

150µF

C14

10µF

R6

4.7Ω

J1–18

J1–17

J1–16

J1–15

SLVP111 = 3.3 V

SLVP112 = 2.5 V

SLVP113 = 1.8 V

SLVP114 = 1.5 V

O

V

J1–4

J1–2

J1–11

J1–14

J1–13

J1–12 PWR

GND

SENSEH

V

SENSEL/

V

ANAGND

R12

4.7Ω

C18

0.1µF

R8

100Ω1%

C22

1µF

C21

0.1µF

R11

20 kΩ

1%

C20

1000 pF

R10

100Ω

1%

C17

0.1µF

R10

1%

20 kΩ

C19

0.01µF

R13

750Ω

R7

1 kΩ

R9

11 kΩ

J1–5

J1–6

J1–9

J1–10

J1–7

J1–8

J1–3

J1–1

VI

RETURN

12 V

RETURN

PG

INHIBIT

NOTE: Last two digits of U1 indicates output voltage option

TPS5633 = 3.3 V (SLVP111)

TPS5625 = 2.5 V (SLVP112)

TPS5618 = 1.8 V (SLVP113)

TPS5618 = 1.5 V (SLVP114)

Contents

Main Page Preface Read This First About This Manual How to Use This Manual Information About Cautions and Warnings Related Documentation From Texas Instruments Synchronous Buck Converter Design Using TPS56xx Controllers in SLVP10x EVMs Users Guide The TPS56xx Family of Power Supply Controllers FCC Warning Trademarks Contents Figures Tables Page Chapter 1 Introduction Topic Page 1.1 Synchronous Buck Regulator Operation Figure 11. Simplified Synchronous Buck Converter Schematic 1.2 Hysteretic Control Operation Figure 12. Simplified Hysteretic Controlled Output Voltage Waveform 1.3 Design Strategy Providing a DSP Power Solution from 5 V or 3.3 V Only Systems Table 11.Summary of EVM Converter Modules 1.4 Design Specification Summary Table 12.EVM Converter Operating Specifications Design Specification Summary Table 12.EVM Converter Operating Specifications (Continued) Schematic Introduction 1-7 1.5 Schematic Figure 13. SLVP111114 EVM Converter Schematic Diagram Bill of Materials 1.6 Bill of Materials Table 13 lists materials required for the SLVP111114 EVMs. Table 13.SLVP111114 EVMs Bill of Materials Bill of Materials Introduction Table 13.SLVP111114 EVMs Bill of Materials (Continued) 1.7 Board Layout Page Page Chapter 2 Design Procedure hysteretic Topic Page 2.1 TPS56xx Functions TPS56xx Functions Design Procedure 2-3 Figure 21. TPS56xx Functional Block Diagram 2.1.1 VCC Undervoltage Lockout 2.1.2 Inhibit 2.1.3 Slowstart Design 2.1.4 Hysteresis Setting Page 2.1.5 Noise Suppression Figure 22. Block Diagram Showing Noise Suppression Circuits 2.1.6 Overcurrent Protection Figure 23. V DS Sensing Circuit Page 2.1.7 Overvoltage Protection 2.1.8 Power Good 2.1.9 Bias 2.1.10 Gate Drivers TPS56xx Functions Figure 24. Gate Driver Block Diagram Figure 25. IV Characteristic Curve for Low-Side Gate Drivers 2.1.10.1 Low-Side Driver Controls 2.1.10.2 High-Side Driver 2.1.10.3 Grounding Layout Guidelines . 2.2.3.1 Output Capacitance ESR mV m 2.2.3.2 Output Inductance 2.2.4 Switching Frequency Analysis External Component Selection 2-18 Figure 26. Output Ripple Voltage Detail L Io DS(on) ) Page 2.2.5 Power MOSFET Selection Test Results 3.1 Test Summary 3.1.1 Static Line and Load Regulation 3.1.2 Output Voltage Ripple 3.1.3 Efficiency and Power Losses 3.1.4 Output Start-Up and Overshoot 3.1.5 Frequency Variation Designing Fast Response Synchronous Buck Converters Using the TPS5210 controller A Fast, Efficient Synchronous-Buck Controller for Microprocessor Power Supplies 3.1.6 Load Current Transient Response 3.1.8 Conclusion 3.2 Test Setup R Watts R + 3-7 3.3 Test Results Figures 32 to 3102 show test results for the SLVP111. Figure 32. SLVP111 Measured Load Regulation SLVP111 MEASURED LOAD REGULATION Figure 33. SLVP111Measured Efficiency Figure 34. SLVP111Measured Power Dissipation SLVP111 MEASURED POWER DISSIPATION Figure 35. SLVP111Measured Switching Frequency SLVP111 MEASURED SWITCHING FREQUENCY 3-9 Figure 36. SLVP111 Measured Switching Waveforms Figure 37. SLVP111Measured Start-Up (INHIBIT) Waveforms 3-10 Figure 38. SLVP111 Measured Start-Up (V Figure 39. SLVP111Measured Start-Up (V 3-11 Figure 310. SLVP111 Measured Load Transient Waveforms Figure 311. SLVP112 Measured Load Regulation SLVP112 MEASURED LOAD REGULATION 3-12 Figure 312. SLVP112 Measured Efficiency SLVP111 MEASURED EFFICIENCY Figure 313. SLVP112 Measured Power Dissipation SLVP111 MEASURED POWER DISSIPATION 3-13 Figure 314. SLVP112 Measured Switching Frequency SLVP112 MEASURED SWITCHING FREQUENCY Figure 315. SLVP112 Measured Switching Waveforms 3-14 Figure 316. SLVP112 Measured Start-Up (INHIBIT) Waveforms Figure 317. SLVP112 Measured Start-Up (V 3-15 Figure 318. SLVP112 Measured Start-Up (V Figure 319. SLVP112 Measured Load Transient Waveforms 3-16 Figure 320. SLVP113 Measured Load Regulation SLVP113 MEASURED LOAD REGULATION Figure 321. SLVP113 Measured Efficiency SLVP113 MEASURED EFFICIENCY 3-17 Figure 322. SLVP113 Measured Power Dissipation SLVP113 MEASURED POWER DISSIPATION Figure 323. SLVP113 Measured Switching Frequency SLVP113 MEASURED SWITCHING FREQUENCY 3-18 Figure 324. SLVP113 Measured Switching Waveforms Figure 325. SLVP113 Measured Start-Up (INHIBIT) Waveforms 3-19 Figure 326. SLVP113 Measured Start-Up (V Figure 327. SLVP113 Measured Start-Up (V 3-20 Figure 328. SLVP113 Measured Load Transient Waveforms Figure 329. SLVP114 Measured Load Regulation SLVP114 MEASURED LOAD REGULATION 3-21 Figure 330. SLVP114 Measured Efficiency SLVP114 MEASURED EFFICIENCY Figure 331. SLVP114 Measured Power Dissipation SLVP114 MEASURED POWER DISSIPATION 3-22 Figure 332. SLVP114 Measured Switching Frequency SLVP114 MEASURED SWITCHING FREQUENCY Figure 333. SLVP114 Measured Switching Waveforms 3-23 Figure 334. SLVP114 Measured Start-Up (INHIBIT) Waveforms Figure 335. SLVP114 Measured Start-Up (V 3-24 Figure 336. SLVP114 Measured Start-Up (V Figure 337. SLVP114 Measured Load Transient Waveforms