Texas Instruments TPS51220EVM Manual de usuario

User’s Guide

TPS51220 Buck Controller Evaluation Module User's

Guide

Table of Contents

1 Description.............................................................................................................................................................................. 2

2 Electrical Performance...........................................................................................................................................................2

3 Schematic................................................................................................................................................................................3

4 Test Setup and Procedure......................................................................................................................................................4

4.1 Test Setup.......................................................................................................................................................................... 4

4.2 Test Procedure................................................................................................................................................................... 4

5 Configuration.......................................................................................................................................................................... 5

5.1 Switching Frequency Selection.......................................................................................................................................... 5

5.2 Skip Mode and Control Scheme Selection.........................................................................................................................5

5.3 Current-Sensing Selection................................................................................................................................................. 5

5.4 Overcurrent Limit and Discharge Selection........................................................................................................................6

5.5 Control Mode and Protection Selection..............................................................................................................................6

5.6 Soft-Start Setting Selection................................................................................................................................................ 6

5.7 Output Voltage Adjustment................................................................................................................................................ 6

6 Bill of Materials....................................................................................................................................................................... 7

7 EVM Assembly Drawing and PCB Layout............................................................................................................................ 9

8 Reference...............................................................................................................................................................................11

9 Revision History....................................................................................................................................................................11

Trademarks

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

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TPS51220 Buck Controller Evaluation Module User's Guide 1

1 Description

The TPS51220 is a dual, peak-current mode, synchronous step-down controller with three low-dropout (LDO)

regulators. It is optimized for 5-V /3.3-V notebook system power supplies. A 99% duty cycle operation enables

designers to complete Li-ion battery applications from 2-cells to 4-cells cost effectively. The TPS51220 supports

high-efficiency, fast transient response and 99% duty cycle operation. DCR current sensing provides lossless

current sensing and free MOSFET selection; resistor sensing supports accurate current-sensing operation. It

supports supply input voltages ranging from 4.5 V to 30 V and output voltages from 1 V to 12 V. High-current, 5

V at 100 mA, 3.3 V at 10 mA, onboard linear regulators have glitch-free switchover function to SMPS, and the

2-V reference has a 100-μA capability.

A peak current-sensing current mode and fixed-frequency control scheme support the full range of current mode

operation including simplified loop compensation, ceramic output capacitors, as well as a seamless transition to

reduced frequency operation at light-load condition.

This evaluation module demonstrates the performance of the high-current/ high-efficiency TPS51220 buck

converter

2 Electrical Performance

SPECIFICATIONS TEST CONDITIONS MIN TYP MAX UNIT

Input voltage range (VIN) 8 12 20 V

CH1 Output voltage 5 V

Operating frequency VIN = 12 V, Iout1 = 6 A 280 kHz

Output current VIN = 8 V to 20 V 6 A

Over current limit VIN = 12 V 9 A

Output ripple voltage VIN = 12 V, Iout1 = 6 A 15 mVp-p

CH2 Output voltage 3.3 V

Operating frequency VIN = 12 V, Iout2 = 6 A 280 kHz

Output current VIN = 8 V to 20 V 6 A

Over current limit VIN = 12 V 9 A

Output ripple voltage VIN = 12 V, Iout2 = 6 A 15 mVp-p

Description www.ti.com

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3 Schematic

Figure 3-1. HPA302 EVM Schematic Diagram (DCR-Sensing)

www.ti.com Schematic

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TPS51220 Buck Controller Evaluation Module User's Guide 3

4 Test Setup and Procedure

4.1 Test Setup

Connect test equipment and HPA302-EVM board as shown in Figure 4-1.

HPA302

TPS5122xEVM

CH1

Oscilloscope

TP1

TP2

GNDIVIN

DMM1

TP7

(VREG5)

TP9

(VREG3)

DMM5

TP8

(VREF2)

DMM6

CH2

Oscilloscope

TP12

TP13

DMM3

GNDS

SYNC

DMM4

DMM2

VOUT1

GND1

GND2

VOUT2

TP14

TP15

Electronic

Load-1

12 V/10 A

Power

Supply

Electronic

Load-1

Figure 4-1. Equipment Setup for TPS51220EVM Board

4.2 Test Procedure

1. Ensure that the switches S1 (EN1), S2 (EN2), and S3 (EN) are in OFF position.

2. Ensure that the shunt jumpers for JP1 (TRIP) is set 7-pin to 8-pin (VREG5; Vocl = 60 mV, Discharge-

enabled), JP2 (FUNC) is set 1-pin to 2-pin (GND; UVP/OVP-enabled), and JP3, JP4 are set 3-pin to 4-pin

(VREF2; Auto-skip).

3. Apply appropriate VIN voltage to VIN and GNDI terminals. Check that VREG3 (3.3V-LDO) starts up.

4. Turn S3 (EN) to ON. Check that VREG5 (5V-LDO) and VREF2 (2V-Ref) start up.

5. When S1 (EN1) is turned to ON, CH1-output starts up.

6. When S2 (EN2) is turned to ON, CH2-output starts up.

Test Setup and Procedure www.ti.com

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5 Configuration

Users can configure this EVM per the following configurations.

5.1 Switching Frequency Selection

The switching frequency can be set by the RF-resistor (R15) or applying external clock into RF pin on the EVM.

Default setting is 280-kHz using RF resistor.

Table 5-1. Switching Frequency Selection

Connection

Internal

Add RF-resistor from RF to GND and be R31 open

[ ]

1 10

= [kHz]

f´

External Apply external clock signal to SYNC (5 Vpp and 50% duty) , remove R15 in addition, and add

0-Ω to R31.

5.2 Skip Mode and Control Scheme Selection

The skip mode can be set by the SKIPSEL1,2 pins using JP3 and JP4 on the EVM.

Default setting is Auto-skip.

Table 5-2. Skip Mode Selection

Jumper (JP3, JP4) set to SKIPSEL1,2 Skip

Top (1-2 pin shorted) GND CCM

Second (3-4 pin shorted) VREF2 Auto-skip

Third (5-6 pin shorted) VREG3 OOA (<400-kHz)

Bottom (7-8 pin shorted) VREG5 OOA (>400-kHz)

5.3 Current-Sensing Selection

The current-sensing scheme can be set by the external current sensing devices, using some resistors on the

EVM.

Default setting is Inductor DCR sensing

Table 5-3. Current-Sensing Scheme Selection (CH1)

R8 R29 R35 R36 R6 R7 R25

Inductor DCR Put on(1) Put on(1)

(if necessary)

Put on(1) Put on(1) Open Open Open

External Resistor Put on(1) Put on(1)

(if necessary)

Put on(1) Open Put on (1)

Cut trace

Open Open

(1) "Put on” means add appropriate resistor.

Table 5-4. Current Sensing Scheme Selection (CH2)

R18 R28 R33 R37 R20 R19 R26

Inductor DCR Put on(1) Put on(1)

(if necessary)

Put on(1) Put on(1) Open Open Open

External Resistor Put on(1) Put on(1)

(if necessary)

Put on(1) Open Put on (1)

Cut trace

Open Open

(1) "Put on” means add appropriate resistor.

For external resistor sensing, cut the trace as follows.

www.ti.com Configuration

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TPS51220 Buck Controller Evaluation Module User's Guide 5

Figure 5-1. (CH1) Cut Trace Underneath R6 Figure 5-2. (CH2) Cut Trace Underneath R20

5.4 Overcurrent Limit and Discharge Selection

The overcurrent limit threshold and discharge function can be set by the TRIP pin using JP1 on the EVM.

Default setting is 60 mV and discharge enabled.

Table 5-5. TRIP/ Discharge Mode Selection

Jumper (JP2) set to TRIP VOCL Discharge

Top (1-2 pin shorted) GND 31 mV Enabled

Second (3-4 pin shorted) VREF2 31 mV Disabled

Third (5-6 pin shorted) VREG3 60 mV Disabled

Bottom (7-8 pin shorted) VREG5 60 mV Enabled

5.5 Control Mode and Protection Selection

The control mode and protection function can be set by the FUNC pin using JP2 on the EVM.

Default setting is current mode and UVP/OVP-enabled.

Table 5-6. Control Mode/OVP Selection

Jumper (JP2) set to FUNC Mode OVP

Top (1-2 pin shorted) GND Current Enabled

Second (3-4 pin shorted) VREF2 D-CAP Disabled

Third (5-6 pin shorted) VREG3 D-CAP Enabled

Bottom (7-8 pin shorted) VREG5 Current Disabled

5.6 Soft-Start Setting Selection

Output voltage soft-start time can be set by the ENx pin using some capacitors on the EVM.

Default setting is integrated soft start.

Table 5-7. Soft-Start Setting Selection(1)

CH1 (C20) CH2 (C7)

Integrated soft start Open (adding small bypass-capacitor; 100 pF) Open (adding small bypass-capacitor; 100 pF)

External soft start Put on Put on

(1) When external soft start is selected, add appropriate capacitor on C20 and/or C7.)

5.7 Output Voltage Adjustment

Output voltage is programmable by changing R2, R3, and R5 for CH1 and R21, R23, and R24 for CH2.

Default setting is 5 V for CH1 and 3.3 V for CH2.

Configuration www.ti.com

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V (CH1) =

out

(R5 + R2 + R3) x V (= 1 V)

ref

(1)

When Vout(CH1) is set above 5 V, V5SW input resistor (R22) must be open.

R24

V (CH2) =

out

(R21 + R23 + R24) x V (= 1 V)

ref

(2)

6 Bill of Materials

Table 6-1. Bill of Materials

Reference Qty Description Size Mfr Part Number

C1, C14, C26 3 Capacitor, Ceramic, 10 nF, 50V, X7R, 20% 0603 Std Std

C2, C3 2 Capacitor, SPCAP, 150 μF, 6.3-V, 15-mΩ,

20%

7343 Panasonic EEFCX0J151R

C4, C5, C6, C21,

C22, C23

6 Capacitor, Ceramic, 0.1 μF, 50V, X7R, 20% 0603 TDK C1608X7R1H104K

C7, C16, C20, C27 4 Capacitor, Ceramic, 100 pF, 50V, CH, 5% 0603 TDK C1608CH1H101J

C8, C33 0 Capacitor, Ceramic, 10 μF, 25V, X7R, 20% 1210 – –

C9, C18, C19, C32 4 Capacitor, Ceramic, 10 μF, 25V, X7R , 20% 1210 Murata GRM32DR71E106KA

C10 1 Capacitor, Ceramic, 2.2F, 6.3V, X7R (or

X5R), 10%

0603 Murata

TDK

GRM188R70J225KA

C1608X5R0J225K

C11 0 Capacitor, Ceramic 0603 – –

C12 1 Capacitor, Ceramic, 47pF, 50V, CH, 5% 0603 TDK C1608CH1H470J

C13 1 Capacitor, Ceramic, 0.22F, 50V, X7R, 10% 0630 TDK C1608X7R1E224K

C15 1 Capacitor, Ceramic, 10F, 10V, X7R (or

X5R), 10%

0805 Murata

TDK

GRM21BR71A106K

C2012X5R0J106K

C17 0 Capacitor, Ceramic 0603 – –

C24, C29 0 Capacitor 7343 – –

C25, C30 2 Capacitor, SPCAP, 220F, 4-V, 15-mΩ, 20% 7343 Panasonic EEFCX0G221R

C28 0 Capacitor, Ceramic 0603 – –

C31 0 Capacitor, Ceramic 0603 – –

D1, D2 0 Diode 0.1 × 0.049 inch – –

L1 1 Inductor, 4.7μH, 10.2A, 12.9-mΩ 0.4 × 0.4 inch TOKO FDV1040-4R7M

L2 1 Inductor, 3.3μH, 10.7A, 10.5-mΩ 0.4 × 0.4 inch TOKO FDV1040-3R3M

Q1, Q3 2 MOSFET, N-ch, 30-V, 14-A, 9.7-mΩ SO8 TI CSD17307Q5A

Q2, Q4 2 MOSFET, N-ch, 30-V, 21-A, 4.5-mΩ SO8 TI CSD17310Q5A

R1, R4, R9, R17,

R22, R34, R35,R36,

R37

9 Resistor, Chip, 0Ω, 1/10W, 1% 0603 Std Std

R2 1 Resistor, Chip, 120kΩ, 1/10W, 1% 0603 Std Std

R3 1 Resistor, Chip, 30kΩ, 1/10W, 1% 0603 Std Std

R5, R23 2 Resistor, Chip 49.9 or 51Ω, 1/10W, 1% 0603 Std Std

R6 0 Resistor, Chip, mΩ, 1 W, 1% 3712 Std Std

R7, R25 0 Resistor, Chip 0603 Std Std

R8 1 Resistor, Chip, 7.5kΩ, 1/10W, 1% 0603 Std Std

R10 0 Resistor, Chip 0603 Std Std

R11, R14 2 Resistor, Chip, 470kΩ, 1/10W, 1% 0603 Std Std

R12, R13 2 Resistor, Chip, 10kΩ, 1/10W, 1% 0603 Std Std

R15 1 Resistor, Chip, 360kΩ, 1/10W, 1% 0603 Std Std

R16 0 Resistor, Chip 0603 Std Std

R18, R28 2 Resistor, Chip, 5.6kΩ, 1/10W, 1% 0603 Std Std

R19, R26 0 Resistor, Chip 0603 Std Std

www.ti.com Bill of Materials

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TPS51220 Buck Controller Evaluation Module User's Guide 7

Table 6-1. Bill of Materials (continued)

Reference Qty Description Size Mfr Part Number

R20 0 Resistor, Chip, mΩ, 1 W, 1% 3712 Std Std

R21 1 Resistor, Chip, 62kΩ, 1/10W, 1% 0603 Std Std

R24 1 Resistor, Chip, 27kΩ, 1/10W, 1% 0603 Std Std

R27 0 Resistor, Chip 0603 Std Std

R32 0 Resistor, Chip 0603 Std Std

R29 1 Resistor, Chip, 4.7kΩ, 1/10W, 1% 0603 Std Std

R30, R33 2 Resistor, Chip, 15.4Ω, 1/10W, 1% 0603 Std Std

R31 0 Resistor, Chip 0603 Std Std

R38 1 Resistor, Chip, 0Ω, 1/10W, 1% 0603 Std Std

R39 1 Resistor, Chip, 0Ω, 1/10W, 1% 0603 Std Std

S1, S2, S3 3 Switch, ON-ON Mini Toggle 0.28 × 0.18" Nikkai G12AP

J1, J2 2 Terminal Block, 2-pin, 15A, 5,1mm 0.40 × 0.35inch OST ED1609

JP1, JP2, JP3, JP4 4 Header, 2×4-pin, 100mil spacing (36-pin strip) 0.20 × 0.40inch Sullins PTC36DAAN

— 4 Shunt, 100-mil, Black 0.100 Std Std

TP1, TP2 2 Pin, Probe monitor (VOUT1) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP3, TP10, TP11 3 Pin, Probe monitor (EN, ENx) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP4, TP17 2 Pin, Probe monitor (SW-node) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP5 0 Pin, Probe monitor (IMON) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP6, TP18 2 Pin, Probe monitor (PGOOD) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP7, TP8, TP9 3 Pin, Probe monitor (LDO) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP12, TP13 2 Pin, Probe monitor (VOUT2) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP14, TP15 2 Pin, Probe monitor (VIN) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

TP16 0 Pin, Probe monitor (IMON) 0.12(D) × 0.4 inch Keystone or

MAC8

5002 LC-2-S

U1 1 IC, Dual Peak Current Mode, Sync. Step-

down Controller

QFN32 TI TPS51220RHB

VIN, GNDI 2 Pin, Wiring Terminal (VIN) 0.12(D) × 0.4 inch Mill Max or

MAC8

3183-2-00-15-00-00-080

or WT-3-1

VOUT1, GND1,

GND3

3 Pin, Wiring Terminal (VOUT1) 0.12(D) × 0.4 inch Mill Max or

MAC8

3183-2-00-15-00-00-080

or WT-3-1

VOUT2, GND2,

GND4

3 Pin, Wiring Terminal (VOUT2) 0.12(D) × 0.4 inch Mill Max or

MAC8

3183-2-00-15-00-00-080

or WT-3-1

SYNC, GNDS 2 Pin, Wiring Terminal (SYNC) 0.12(D) × 0.4 inch Mill Max or

MAC8

3183-2-00-15-00-00-080

or WT-3-1

Bill of Materials www.ti.com

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7 EVM Assembly Drawing and PCB Layout

Figure 7-1. Top Layer/ Assembly

Figure 7-2. Inner Layer 1

www.ti.com EVM Assembly Drawing and PCB Layout

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TPS51220 Buck Controller Evaluation Module User's Guide 9

Figure 7-3. Inner Layer 2

Figure 7-4. Bottom Layer/ Assembly

EVM Assembly Drawing and PCB Layout www.ti.com

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