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Input Voltage Ripple

2-12

2.8

Input Voltage Ripple

The TPS54x73EVM-225 input voltage ripple is shown in Figure 2–15 and
Figure 2–16 for each device type. The input voltage is 3.3 V for the TPS54673
the input voltage is 5 V for the TPS54873. Output current for each device is
the rated full load.

Figure 2–15. Input Voltage Ripple, TPS54673

VO (ac) 100 mV/div

Time Scale – 1 

µ

s/div

Figure 2–16. Input Voltage Ripple, TPS54873

VO (ac) 100 mV/div

Time Scale – 1 

µ

s/div

Содержание TPS54673EVM-225

Страница 1: ...January 2003 PMP EVMs User s Guide SLVU079...

Страница 2: ...t that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in wh...

Страница 3: ...handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s r...

Страница 4: ...If there is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 55 C The EVM is de...

Страница 5: ...scriptions are included How to Use This Manual This document contains the following chapters Chapter 1 Introduction Chapter 2 Test Setup and Results Chapter 3 Board Layout Chapter 4 Schematic and Bill...

Страница 6: ...673 SLVS433 TPS54873 SLVS444 FCC Warning This equipment is intended for use in a laboratory test environment only It gen erates uses and can radiate radio frequency energy and has not been tested for...

Страница 7: ...t Output Connections 2 2 2 2 Efficiency 2 3 2 3 Power Dissipation 2 5 2 4 Output Voltage Regulation 2 6 2 5 Load Transients 2 8 2 6 Loop Characteristics 2 9 2 7 Output Voltage Ripple 2 11 2 8 Input Vo...

Страница 8: ...4673 2 11 2 14 Measured Output Ripple Voltage TPS54873 2 11 2 15 Input Voltage Ripple TPS54673 2 12 2 16 Input Voltage Ripple TPS54873 2 12 2 17 Measured Start Up Waveform TPS54673 With No Precharge 2...

Страница 9: ...ge and Output Current Summary 1 2 1 2 TPS54673EVM 225 Performance Specification Summary 1 3 1 3 TPS54873EVM 225 Performance Specification Summary 1 3 1 4 Output Voltage Programming 1 4 4 1 TPS54x73EVM...

Страница 10: ...x...

Страница 11: ...well as support documentation for the TPS54673EVM 225 and TPS54873EVM 225 evaluation modules SLVP225 The TPS54x73EVM 225 performance specifications schematic and bill of materials are given Topic Pag...

Страница 12: ...justable output voltage and a customizable loop reponse The disabled sink during start up DSDS feature allows the TPS54x73 family of regulators to be used in applications where it is necessary to preb...

Страница 13: ...rise time 4 7 8 4 15 ms Operating frequency 700 kHz Maximum efficiency VI 3 3 V Vo 2 5 V IO 1 0 A 93 Note Maximum duty cycle is approached as VI approaches 3 V limiting input voltage range for VO 2 5...

Страница 14: ...9 1000 1 2 28 7 1 5 14 7 1 8 9 76 2 5 5 49 3 3 3 74 The minimum output voltage is limited by the minimum controllable on time of the device 200 ns and is dependent upon the duty cycle and operating fr...

Страница 15: ...rate disable sink during start up DSDS to allow this type of functionality in the SWIFT family of dc dc converters A typi cal design approach is to tie the output of the core voltage to the output of...

Страница 16: ...1 6...

Страница 17: ...EVM 225 and covers efficiency output voltage regulation load transients loop response output ripple input ripple and start up Topic Page 2 1 Input Output Connections 2 2 2 2 Efficiency 2 3 2 3 Power D...

Страница 18: ...ltage The TPS54X72 is intended to be used as a point of load regulator In typical applications it is usually located close to the input voltage source When using the TPS54x73EVM 225 with an external p...

Страница 19: ...ient temperature of 25 C The efficiency is lower at higher ambient temperatures due to temperature variation in the drain to source resistance of the MOSFETs The efficiency is slightly lower at 700 kH...

Страница 20: ...Efficiency 2 4 Figure 2 3 Measured Efficiency TPS54873 50 55 60 65 70 75 80 85 90 95 100 0 1 2 3 4 5 6 7 8 9 Efficiency EFFICIENCY vs OUTPUT CURRENT IO Output Current A VI 5 V VO 3 3 V...

Страница 21: ...e junction temperature is approximately 60 C while the case temperature is approximately 55 C The total circuit losses at 25 C are shown in Figure 2 4 The input voltage for the TPS54673 is 3 3 V and f...

Страница 22: ...n Figure 2 5 while the output voltage line regulation is shown in Figure 2 6 Measurements are given for an ambient temperature of 25 C Figure 2 5 Load Regulation 0 5 0 4 0 3 0 2 0 1 0 0 1 0 2 0 3 0 4...

Страница 23: ...ote The lower limit for the TPS54673 input voltage is about 3 02 V because the device is operating at its maximum duty cycle 2 4 2 5 2 6 2 7 2 8 2 9 3 3 1 3 2 3 3 3 4 3 5 3 3 5 4 4 5 5 5 5 6 TPS54673...

Страница 24: ...rrent step is from 25 to 75 percent of maximum rated load Total peak to peak voltage variation is as shown including ripple and noise on the output Figure 2 7 Load Transient Response TPS54673 VO ac 20...

Страница 25: ...ng ripple and noise on the output Figure 2 9 Measured Loop Response TPS54673 VI 3 V 60 50 40 30 20 10 0 10 20 30 40 50 60 100 1 k 10 k 100 k 1 M 180 150 120 90 60 30 0 30 60 90 120 150 180 Gain Phase...

Страница 26: ...0 150 120 90 60 30 0 30 60 90 120 150 180 Gain Phase Gain dB f Frequency Hz MEASURED LOOP RESPONSE Phase Degrees Figure 2 12 Measured Loop Response TPS54873 VI 6 V 60 50 40 30 20 10 0 10 20 30 40 50 6...

Страница 27: ...type The input voltage is 3 3 V for the TPS54673 The input voltage is 5 V for the TPS54873 Output current for each device is the rated full load Voltage is measured directly across output capacitors...

Страница 28: ...re 2 16 for each device type The input voltage is 3 3 V for the TPS54673 the input voltage is 5 V for the TPS54873 Output current for each device is the rated full load Figure 2 15 Input Voltage Rippl...

Страница 29: ...maximum duty cycle is reached switching starts and the output rises quickly while the output voltage catches up with the slow start ramp rate At this point the voltage on the VSENSE pin matches the in...

Страница 30: ...precharge voltage As in the previous example when the internal reference exceeds the voltage fed back to the VSENSE pin the output begins to ramp up to its final preset value at the slow start rate It...

Страница 31: ...ptions of the TPS54673 waveforms are applicable for the TPS54873 except that the input voltage is 5 V the output voltage is 3 3 V and the UVLO start up threshold is 3 8 V Figure 2 20 Measured Start Up...

Страница 32: ...Start Up 2 16 Figure 2 22 Measured Start Up Waveform TPS54873 With Precharge and No Load VI 1 V div Time Scale 5 s div VO 1 V div...

Страница 33: ...3 1 Board Layout This chapter provides a description of the TPS54x73EVM 225 board layout and layer illustrations Topic Page 3 1 Layout 3 2 Chapter 3...

Страница 34: ...dedicated ground planes The bottom layer contains pads for an optional alternate output filter including space for three D3 or D4 case size electrolytic capacitors and an alternate inductor of 0 5 in...

Страница 35: ...Layout 3 3 Board Layout Figure 3 2 Internal Layer 1 Layout Figure 3 3 Internal Layer 2 Layout...

Страница 36: ...Layout 3 4 Figure 3 4 Bottom Side Layout Looking From Top Side Figure 3 5 Top Side Assembly...

Страница 37: ...Layout 3 5 Board Layout Figure 3 6 Bottom Side Assembly Showing Optional Components...

Страница 38: ...3 6...

Страница 39: ...4 1 Schematic and Bill of Materials The TPS54x73EVM 225 schematic and bill of materials are presented in this chapter Topic Page 4 1 Schematic 4 2 4 2 Bill of Materials 4 3 Chapter 4...

Страница 40: ...F C3 1 F R5 10 k VIN TP4 C4 470 pF R3 10 k R3 10 k C1 470 pF R2 301 C4 12 pF R4 TP5 TP10 R8 0 TP2 VOUT J1 1 2 VOUT GND TP3 TP1 0 1 F C13 22 F C5 22 F C7 22 F C7 L1 0 65 H R7 2 2 3300 pF C11 1 2 L2 PH...

Страница 41: ...tra fast rectifier 1 A 200 V SMB On Semiconductor MURS120T3 3 3 J1 J2 J4 Terminal block 2 pin 15 A 5 1 mm 148830 OST ED1609 3 3 J3 J5 J6 Header 2 pin 100 mil spacing 36 pin strip 0 100 2 Sullins PTC36...

Страница 42: ...of Materials 4 4 Table 4 1 TPS54x73EVM 225 Bill of Materials Continued Count 1 2 RefDes Description Size MFR Part Number 1 1 PCB 3 in 3 in 0 062 in Any SLVP225 3 3 Shunt 100 mil black 0 100 3M 929950...

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