Texas Instruments UCC25230EVM-662 Manual de usuario

Using the UCC25230EVM-662

User's Guide

Literature Number: SLUU863

February 2012

User's Guide

SLUU863–February 2012

Biased Half-Bridge Converter with UCC28250

Secondary-Side Control for 48-V Telecom Applications

1 Introduction

This EVM is used to evaluate bias power supply with UCC25230 used in the UCC28250, based on a

secondary-side controlled, half-bridge DC-to-DC converter. The UCC25230EVM-662 is actually a

combination of two released EVMs, UCC28250EVM-564 and UCC25230EVM-754. The

UCC28250EVM-564 is an EVM of secondary-side controlled symmetrical half-bridge DC-to-DC converter.

The UCC25230EVM-754 is used to bias the UCC28250EVM-564 and allow for stand-alone operation in

the UCC28250EVM-564. The targeted application is telecom module design with nominal 48-V input.

UCC28250 is a PWM controller that can be used for primary-side control or secondary-side control. In this

EVM, the UCC28250 is placed at the secondary side to make secondary-side control. The UCC25230 is a

highly integrated PWM controller operating as an isolated Forward-Flyback, or Flybuck™controller. It has

integrated high-side and low-side power switches and a control circuit with all the key converter functions

included.

2 Description

The EVM is a 100-W symmetrical half-bridge DC-to-DC converter that converts 36 V to 72 V DC to a

regulated output voltage of 3.3 V and a maximum of 30-A load current. The EVM is designed in

stand-alone operation without additional external auxiliary power sources.

2.1 Typical Applications

•48-V Telecom Modular Applications With Secondary-Side Control

•Server Systems

•Datacom

•DSP’s, ASIC’s, and FPGA’s

2.2 Features

•Start Up Directly from Telecom Input Voltage 36 V to 72 V DC

•Regulated Output Voltage 3.3 V (with maximum 30-A load current)

•Smooth and Monotonic Output Voltage Turn On (with Up to 90% pre-biased output voltage)

•Output Voltage Regulation (from no load to full load, and from low line to high line)

•Primary-Side Enable ON/OFF Function and Manual Switch for Line-Under Voltage On or Off

•Secondary-Side Control

•Control-Driven Synchronous Rectifier

•Non-Latching Output Over-Voltage Protection and Hiccup Over-Current Protection

•Telecom Isolation from Primary-to-Secondary 1500 VDC

•Test Points to Facilitate the Device Evaluation

2Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V SLUU863–February 2012

Telecom Applications Submit Documentation Feedback

www.ti.com

Electrical Performance Specifications

3 Electrical Performance Specifications

Table 1. UCC25230EVM-662 Electrical Performance Specifications

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Input Characteristics

Voltage range 36 48 72 V

Maximum input current VIN = 36 V and IOUT = 30 A 3.5 A

No load input current VIN = 72 V 90 mA

Output Characteristics

Output voltage, VOUT Output current = 0 A 3.25 3.30 3.35 V

Output load current, IOUT 30 A

Output voltage ripple IOUT = 30A 50 mVpp

Output over current inception 32 A

point

Systems Characteristics

Switching frequency 200 kHz

IC clock frequency 400

Peak efficiency 91%

Full load efficiency 90%

Operating temperature Min 200 LFM forced air flow 25 ºC

SLUU863–February 2012 Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V

Telecom Applications

Schematic

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4 Schematic

Figure 1. UCC25230EVM-662 Schematic

4Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V SLUU863–February 2012

Telecom Applications Submit Documentation Feedback

Load

13.3V/

35A V2

FAN

Sourc

J1 TP1 TP2

TP9 TP6

TP3

TP12

TP13

TP7 TP4

TP11

TP5

TP8

TP10

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Test Setup

5 Test Setup

5.1 Test Equipment

Voltage Source: HP 6015A DC power supply, or equivalent to provide 36 VDC to 72 VDC, and minimum

3.5 A.

Multimeters: Fluke 45 dual display multimeter, or equivalent.

Output Load: HPA 6060A DC electronic load, or equivalent capable of 3.3 V and 30 A.

Oscilloscope: A 20-MHz or equivalent analog or digital oscilloscope.

Recommended Wire Gauge: AWG #18 for input voltage connection. AWG #16 for output load

connection.

Ventilation Fan: 200 LFM minimum compatible.

5.2 Recommended Test Setup

Figure 2. UCC25230EVM-662 Recommended Test Set Up

SLUU863–February 2012 Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V

Telecom Applications

Test Setup

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5.3 List of Test Points

Table 2. Test Point Functions

TEST POINTS NAME DESCRIPTION

TP1 PGND Input voltage negative test point, for efficiency test

TP2 Vin+ Input voltage positive test point, for efficiency test

TP3 Bias_P1 Primary bias, 9V.

TP4 VOUT+ Output voltage positive test point for efficiency

TP5 VOUT- Output voltage negative test point for efficiency

TP6 Loop+ Feedback loop injection for UCC25230

TP7 Loop+ Feedback loop injection for UCC28250

TP8 Loop- Feedback loop injection for UCC28250

TP9 Loop- Primary side signal ground

TP10 Prebias+ Prebias output positive input

TP11 Vo_Ripple Output voltage ripple test

TP12 Bias_P Primary bias, 9 V

TP13 Bias_S Secondary bias, 8 V

J1 INPUT Input voltage terminals

J2 OUTPUT Output voltage terminals

6Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V SLUU863–February 2012

Telecom Applications Submit Documentation Feedback

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Test Procedure

6 Test Procedure

Set up the EVM based on Figure 2.

CAUTION

High voltage and high temperature present when the EVM is in operation!

6.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Connect the ammeter A1 (0 A to 10 A range) between DC Source and J1 as shown in Figure 2.

2. Prior to connecting the DC source, it is advisable to limit the source current to 4 A maximum. Make

sure the DC source is initially set to 0 V and connected to J1 and A1 as shown in Figure 2.

3. Connect voltmeter, V1 across the DC source as shown in Figure 2.

4. Connect Load1 to J2 as shown in Figure 2. Set Load1 to constant current mode to sink 0 ADC before

the input voltage on J1 is applied.

5. Connect voltmeter, V2 to J2 as shown in Figure 2.

6. Turn on the ventilation fan making sure to blow air directly on the EVM.

7. Set switch S1 to position B.

8. Increase the DC source voltage from 0 V to 36.0 VDC.

9. Measure VOUT (V2), IOUT, VIN (V1) and IIN (A1).

10. Vary LOAD1 from 0 A to a higher value, up to 30 ADC.

11. Increase input voltage to a different value, up to 72 V, and repeat 9 and 10.

6.2 Equipment Shutdown

1. Decrease Load-1 to 0 A.

2. Decrease VIN to 0 V.

3. Shut down VIN and the fan.

4. Shut down the load.

SLUU863–February 2012 Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V

Telecom Applications

100

0 5 10 15 20 25 30

IOUT - Amps

Efficiency - %

36.0V

48.0V

72.0V

3.050

3.100

3.150

3.200

3.250

3.300

3.350

0 5 10 15 20 25 30

IOUT - Amps

VOUT - V

36.0V

48.0V

72.0V

Performance Data and Typical Characteristic Curves

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7 Performance Data and Typical Characteristic Curves

Figure 3 through Figure 11 present typical performance curves for UCC25230EVM-662.

7.1 Efficiency

Figure 3. UCC25230EVM-662 Efficiency

7.2 Load Regulation

Figure 4. UCC25230EVM-662 Load Regulation

8Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V SLUU863–February 2012

Telecom Applications Submit Documentation Feedback

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

10.00

20.00

30.00

40.00

50.00

0.1 1.0 10.0 100.0

F - Frequency - kHz

Gain - dB

-150.00

-120.00

-90.00

-60.00

-30.00

0.00

30.00

60.00

90.00

120.00

150.00

Gain Phase

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Performance Data and Typical Characteristic Curves

7.3 Bode Plots

Figure 5. UCC25230EVM-662 Feedback Loop Bode Plots

(VIN = 48 V, IO= 15 A)

SLUU863–February 2012 Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V

Telecom Applications

Performance Data and Typical Characteristic Curves

www.ti.com

7.4 Turn-On Waveform

Figure 6. Output Voltage Turn On

(VIN = 48 V, IO= 15 A)

7.5 Turn-on Waveform with Pre-bias Output Voltage

Figure 7. Output Voltage Turn on with Pre bias.

(VIN = 48 V, IO= 0 A, Pre bias = 1.5 V)

10 Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V SLUU863–February 2012

Telecom Applications Submit Documentation Feedback

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