Texas Instruments TPS54110EVM-044 Скачать руководство пользователя страница 20 | Manualshive

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Texas Instruments TPS54110EVM-044 Скачать руководство пользователя страница 20

Powering Up

2-9

Test Setup and Results

2.9

Powering Up

The TPS54110 regulator provides an internal slow-start circuit to ramp the
output voltage up at a steady rate. When the input voltage reches the UVLO
start up threshold, the output begins to ramp up at the internally set rate until
the final output set point is reached. The output voltage waveforms during
power up do not depend on load currents. Longer delay and ramp times can
be programmed using an external slow-start capacitor in the C5 location.
Alternately, the SS/ENA pin can be used as an enable pin. When SS/ENA is
held low, the output is disabled. Releasing the SS/ENA pin allows the output
to ramp up.

Figure 2−11. Powering Up

VI 1 V/div

t − Time − 5 ms/div

VO 500 mV/div

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Содержание TPS54110EVM-044

Страница 1: ...E December 2003 PMP Systems Power User s Guide SLVU102...

Страница 2: ...itute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual p...

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: ...ere 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 designe...

Страница 5: ...out Chapter 4 Schematic and Bill of Materials 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...

Страница 6: ...4 2 Test Setup and Results 2 1 2 1 Input Output Connections 2 2 2 2 Efficiency 2 3 2 3 Power Dissipation 2 4 2 4 Output Voltage Regulation 2 5 2 5 Load Transients 2 6 2 6 Loop Characteristic 2 7 2 7 O...

Страница 7: ...Measured Loop Response TPS54110 VI 6 V 2 7 2 9 Measured Output Voltage Ripple TPS54110 2 8 2 10 Input Voltage Ripple TPS54110 2 8 2 11 Powering Up 2 9 3 1 Top Side Layout 3 2 3 2 Bottom Side Layout 3...

Страница 8: ...th support documentation for the TPS54110EVM 044 evaluation module HPA044 The TPS54110EVM 044 performance specifications are provided along with a schematic and bill of material Topic Page 1 1 Backgro...

Страница 9: ...ctor The high side and low side MOSFETs are incorporated inside the TPS54110 package allowing for compact designs with minimal external circuitry The low drain to source on resistance of the internal...

Страница 10: ...Units Input voltage range 3 0 3 3 or 5 0 6 0 V Output voltage set point 1 5 V Output current range VI 3 V to 5 5 V 1 5 1 5 A Line regulation IO 0 1 5 A VI 3 V to 6 V 0 02 Load regulation VI 3 3 V IO 0...

Страница 11: ...ot available with VI less than 4 V Equation 1 1 R2 10 kW 0 891 V V O 0 891 V Table 1 3 Output Voltage Programming Output Voltage V R2 Value 1 2 28 7 k 1 5 14 7 k 1 8 9 76 k 2 5 5 49 k 3 3 3 74 k The m...

Страница 12: ...044 and covers efficiency output voltage regulation load transients loop response output ripple input ripple and startup Topic Page 2 1 Input Output Connections 2 2 2 2 Efficiency 2 3 2 3 Power Dissip...

Страница 13: ...a place to easily connect an oscilloscope voltage probe to monitor the output voltage The TPS54110 is intended to be used as a point of load regulator In typical applications it is usually located clo...

Страница 14: ...emperature 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 kHz than...

Страница 15: ...nction temperature is approximately 60 C wheras the case temperature is approximately 55 C The total circuit losses at 25 C are shown in Figure 2 3 Power dissipation is shown for input voltages of 3 3...

Страница 16: ...re given for an ambient temperature of 25 C Figure 2 4 Load Regulation 0 1 0 02 0 04 0 0 02 0 04 0 1 0 0 25 0 5 0 75 1 1 25 1 5 OUTPUT VOLTAGE vs OUTPUT CURRENT IO Output Current A Output Voltage Chan...

Страница 17: ...oad transients is shown in Figure 2 6 The current step is from 25 to 75 of maximum rated load Total peak to peak voltage variation is as shown including ripple and noise on the output Figure 2 6 Load...

Страница 18: ...e Figure 2 7 Measured Loop Response TPS54110 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 Phase Gain Gain dB f Frequency Hz MEASURED...

Страница 19: ...red directly across output capacitors Figure 2 9 Measured Output Voltage Ripple TPS54110 VO AC 20 mV div Vphase 5 V div t Time 500 ns div 2 8 Input Voltage Ripple The TPS54110EVM 044 input voltage rip...

Страница 20: ...ernally set rate until the final output set point is reached The output voltage waveforms during power up do not depend on load currents Longer delay and ramp times can be programmed using an external...

Страница 21: ...2 10...

Страница 22: ...3 1 Board Layout This chapter provides a description of the TPS54110EVM 044 board layout and layer illustrations Topic Page 3 1 Layout 3 2 Chapter 3...

Страница 23: ...layer are connections for the remaining pins of the TPS54110 and a large area filled with ground The bottom layer contains ground and VO copper areas and some signal routing The top and bottom ground...

Страница 24: ...Layout 3 3 Board Layout Figure 3 2 Bottom Side Layout Figure 3 3 Top Side Assembly...

Страница 25: ...4 1 Schematic and Bill of Materials The TPS54110EVM 044 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 26: ...C4 C9 0 1 F 10 F R4 71 5 k R7 10 k TP6 VIN U1 TPS54110PWP RT SYNC SS ENA VBIAS VIN VIN VIN PGND PGND PGND PwrPd PH PH PH BOOT PH PH AGND VSENSE COMP PWRGD 20 19 18 17 16 15 14 13 12 11 21 1 2 3 4 5 6...

Страница 27: ...chip 10 k 1 16 W 1 402 std std 1 R2 Resistor chip 14 7 k 1 16 W x 402 std std 1 R3 Resistor chip 1 74 k 1 16 W x 402 std std 1 R4 Resistor chip 71 5 k 1 16 W 1 402 std std 1 R5 Resistor chip 432 1 16...

Страница 28: ...4 4...

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