Texas Instruments UCC28880EVM-616 Manuel utilisateur

Using the UCC28880EVM-616

User's Guide

Literature Number: SLUUB56A

July 2014–Revised August 2014

User's Guide

SLUUB56A–July 2014–Revised August 2014

UCC28880EVM-616 High-Side Buck Evaluation Module

1 Introduction

The UCC28880EVM-616 evaluation module is an offline high-voltage buck-type power supply that

provides 13 VDC at a maximum output of 100 mA. The input accepts a voltage range of 85 VAC to 265 VAC.

The evaluation module also has the option to deliver 5-VDC output using a simple jumper arrangement for

the purpose of quick demonstration (additional power-stage optimization needed for optimal 5-V output

performance).

The evaluation module uses the UCC28880 low quiescent current switcher device. This device integrates

a 700-V FET and controller into one SOIC7 package. The device also features a high-voltage current

source, enabling start-up and operation directly from the rectified mains voltage. The low quiescent current

of the device enables very high efficiency in non-isolated high-side buck low-power converters. Additional

features are low standby power and a minimum number of external components.

The PWM signal generation is based on a maximum constant ON time concept and each ON pulse is

followed by a minimum OFF time to ensure the power MOSFET is not continuously driven in the ON state.

The PWM signal is AND gated with the signal from a current limiter. The AND gated signal controls the

power MOSFET through a driver. Thereby no internal clock is required, and the switching of the power

MOSFET is load dependent. The device is also protected from failure conditions with thermal shutdown,

under-voltage lockout, soft start and overload protection.

2 Applications

The UCC28880 is suited for use in non-isolated off-line systems requiring high efficiency and advanced

fault protection features. Typical applications include:

• Home Appliances

• White Goods

• E Metering

• Home Automation

• Infrastructure

• LED Lighting

2UCC28880EVM-616 High-Side Buck Evaluation Module SLUUB56A–July 2014–Revised August 2014

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Features

3 Features

The UCC28880EVM-616 features include:

• Preset Output Voltage of ~13 V (JP1 not installed)

(modify to ~5-V output voltage by installing jumper J1)

• No Load to 100-mA Load Range

• Universal Off-Line Input Voltage Range

• Meets EN55022 ClassB Conducted Emissions Requirements

• Overload and Output Short-Circuit Protection

• Thermal Shutdown

• Controlled Start Up and Restart After Fault Protection

CAUTION

High voltage levels are present on the evaluation module whenever it is

energized. Proper precautions must be taken when working with the EVM. The

large bulk capacitors, C1 and C2 must be completely discharged before the

EVM can be handled. Serious injury can occur if proper safety precautions are

not followed.

SLUUB56A–July 2014–Revised August 2014 UCC28880EVM-616 High-Side Buck Evaluation Module

Electrical Performance Specifications

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4 Electrical Performance Specifications

Table 1. UCC28880EVM-616 Electrical Performance Specifications (13-V Output)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Characteristics

VIN Input voltage 85 115/230 265 V

fLINE Frequency 47 50/60 64 Hz

No load power VIN = 115 V/230 V, IOUT = 0 mA 27/38 mW

IIN Input current VIN = 85 V, IOUT = 100 mA 50 100 mA

Output Characteristics

VOUT1 (1) Output voltage VIN = 85 V to 265 V, IOUT = 0 mA to 100 mA 12.65 12.6 13.25 V

IOUT Maximum output current VIN = 85 V to 265 V 100 mA

IOUT Output current range VIN = 85 V to 265 V 0 100 mA

VOUT_ripple Output voltage ripple VIN = 85 V to 265 V, IOUT = 0 mA to 100 mA 200 mVpp

POUT Output power VIN = 85 V to 265 V 1.3 W

Systems Characteristics

h Maximum efficiency VIN = 115 V/230 V, IOUT = 100 mA - 80/82 - %

TOP Operating temperature range VIN = 85 V to 265 V, IOUT = 0 mA to 100 mA 0 25 40 °C

Environmental

Conducted EMI Meets CISPR22B/EN55022B

Mechanical Characteristics

W Dimensions Width 3.5 in

L Length 5 in

H Component height 0.75 in

(1) JP1 removed

4UCC28880EVM-616 High-Side Buck Evaluation Module SLUUB56A–July 2014–Revised August 2014

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Electrical Performance Specifications

Table 2. UCC28880EVM-616 Electrical Performance Specifications (5-V Output)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Characteristics

VIN Input Voltage 85 115/230 265 V

fLINE Frequency 47 50/60 64 Hz

No Load Power VIN = 115 V/230 V, IOUT = 0 A 14/24 mW

IIN Input Current VIN = 85 V, IOUT = 100 mA 25 50 mA

Output Characteristics

VOUT1 (1) Output Voltage VIN = 85 V to 265 V, IOUT = 0 mA to 100 mA 4.25 4.35 6.35 V

IOUT Maximum Output VIN = 85 V to 265 V 100 mA

Current

IOUT Output Current Range VIN = 85 V to 265 V 0 100 mA

VOUT(ripple) Output Voltage Ripple VIN = 85 V to 265 V, IOUT = 100 mA 150 mVpp

POUT Output Power VIN = 85 V to 265 V 0.43 W

Systems Characteristics

h Maximum Efficiency VIN = 115 V/230 V, IOUT = 100 mA 62%/61

TOP Operating VIN = 85 V to 265 V, IOUT = 0 mA to 100 mA 0 25 40 °C

Temperature Range

Environmental

Conducted EMI Meets CISPR22B/EN55022B

Mechanical Characteristics

W Dimensions Width 3.5 in

L Length 5 in

H Component height 0.75 in

(1) JP1 inserted.

SLUUB56A–July 2014–Revised August 2014 UCC28880EVM-616 High-Side Buck Evaluation Module

1000V

1N4007

600V

STTH1R06A

2.2mH

121k

12.1k

10.0k

8.2

0.1µF

4.7µF

100µF

GND

282841-2

TP3

TP2

TP5

600V

STTH1R06A

1µF

TP4

JP1

57.6k

1000V

1N4007

85-265VAC

5/13VDC

100mA

GND_IC 1

GND_IC 2

FB 3

VDD 4

HVIN

DRAIN

UCC28880D

282841-2

JP1

FIT

TP1

REMOVE

Vo (Pin2 to Pin1)

13V

JP1

FIT

REMOVE

Vo (Pin2 to Pin1)

13V

1mH

DANGER, HIGH VOLTAGE

Schematic

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5 Schematic

Figure 1. UCC28880EVM-616 Schematic

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Circuit Description

6 Circuit Description

The UCC28880EVM-616 is a non-isolated AC-to-DC high-side buck configuration with direct feedback.

The EVM, on the input side, has a half-wave rectifier assembled for rectification of AC-to-DC, followed by

an EMI filter.

The pre-set output voltage is set to ~13 V (typical) if jumper J3 is not connected, or ~5 V (typical) when

the jumper is inserted. In the high-side buck configuration the output at OUT pin of connector P2 is

positive with respect to GND.

NOTE: The GND node is one diode drop (D2) above the input neutral (N) node.

In addition to the UCC28880 device, the EVM holds the following key components:

• A Half-Wave Rectifier (D1, D2)

• EMI Filter (L1, C1, C2)

• Freewheeling Diode (D4)

• Inductor (L2)

• Load Capacitor (C5) and Pre-Load Resistor (R5)

• Feedback Path (C4, D5, R2, R3, R4, J3)

• VAC Input Connector (P1)

• VDC Output Connector (P2)

Table 3. UCC28880EVM-616 Board Jumpers

DESIGNATOR DESCRIPTION NOTE

JP1 Selecting feedback resistor values to select between 5-V and 13-V output: Output is measured from pin 2

to pin 1 of P2.

• When the jumper is inserted, the output is 5 V.

• When left open, the output is 13 V.

Table 4. UCC28880EVM-616 Test Points

DESIGNATOR DESCRIPTION

TP1 Buck switch node

TP2 High voltage rectified DC

TP3 GND

TP4 GND

TP5 VOUT

Table 5. UCC28880EVM616 Board Connectors

CONNECTOR PIN NUMBER DESCRIPTION

P1 L (pin1) AC mains terminal input (line). AC mains input can be connected in either

polarity. If DC is fed into this connector, then connect the positive VDC to this

node.

Warning: This is a high-voltage node.

N (pin2) AC main terminal input (neutral). AC Mains input can be connected in either

polarity. If DC is fed into this connector, then connect negative VDC to this

node.

Warning: This is a high-voltage node.

P2 Out (5 V/13 V) (pin1) Positive output node.

Gnd (pin2) Negative output node (one diode drop above the input N).

SLUUB56A–July 2014–Revised August 2014 UCC28880EVM-616 High-Side Buck Evaluation Module

+($ =

176

42 + 43

176 =

42 + 43

42×8

Circuit Description

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The UCC28880EVM-616 is configured as a non-isolated AC-to-DC high-side buck converter with direct

feedback. The output voltage OUT is referenced to the GND node, which is referenced to the negative

high voltage node N. The potential difference between these nodes is equivalent to the voltage drop in

diode D2. The output voltage is positive with respect to the GND node. The output voltage at OUT can be

selected to be either ~5 V (typical) or ~13 V (typical) with the jumper JP1. See Table 3 for jumper settings

to select between the two output voltage levels.

AC input voltage can be fed to the AC input nodes L and N in connector P1. When connecting AC input to

P1 it does not matter which way line and neutral are connected to the P1 nodes. When connecting DC

input to P1, please verify that polarity is correct, L is the positive node and N the negative node.

The feedback path, consisting of resistors R2 and R3, diode D5 and capacitor C4, sets the output voltage

to ~13 V by default when the jumper JP1 is open. The diode D5 is identical to D4, and their voltage drops

compensate each other. The feedback is sampling the output voltage level to capacitor C4 during the off

state of the integrated HV FET of the UCC28880 and the output voltage is set by the resistors R2 and R3

following the equation:

(1)

where VOUT is the output voltage and VFB = 1.0 V is the voltage level at the feedback pin. The current

through the external feedback path is set by the total resistance between OUT and GND nodes (resistors

R2 through R3):

(2)

where IFB is the current through the feedback and set to ~100 µA on this board.

When the jumper JP1 is closed, the resistor R4 is connected in parallel with resistor R3, and the output is

set to ~5 V. To change either the output voltage or the feedback path current, use the equations above.

There is a pre-loaded resistor (R5), which sets a pre-load of ~1 mA at the output when 13 V is selected.

With 5 V output, the preload is ~400 µA. A load of up to 100 mA can be applied to the output.

The design of UCC28880EVM-616 is optimized for 13-V output setting. For 5-V setting, there is additional

room for optimization when factors such as audible noise, output voltage ripple, stand-by power etc are

considered. The value of the bootstrap capacitor (C4), the impedance of the feedback divider network (R4,

R3, R2), and output capacitor (C5) are especially critical. The RC time constant of the bootstrap capacitor

and feedback resistor divider network influences voltage on the FB pin, which in turn, influences the burst

pattern of switching pulses in the device. By adjusting these components the frequency of the burst

pattern can be manipulated higher or lower. This is an effective way to address audible noise emanating

from the magnetics and capacitors in the system. A higher RC time constant reduces the frequency of

occurrence of burst pulses, which increases the output voltage ripple unless the value of output capacitor

is also increased alongside. A lower-time constant increases the frequency of the burst pattern, but a

smaller resistor divider impedance increases the stand-by power consumption. These trade-offs have to

be considered when designing the power supply.

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EVM Test Set Up

7 EVM Test Set Up

WARNING

High voltages that may cause injury exist on this evaluation

module (EVM). Please ensure all safety procedures are followed

when working on this EVM. Never leave a powered EVM

unattended.

Figure 2 shows the basic test setup recommended to evaluate the UCC28880EVM-616. Start by applying

a low DC voltage (~15 V to 20 V) into the AC input (P1). When connected correctly the output voltage is

regulated to ~13 V (positive with respect to GND). Once correct output level is obtained, increase the input

voltage to the desired level.

Figure 2. UCC28880EVM-616 Test Setup

SLUUB56A–July 2014–Revised August 2014 UCC28880EVM-616 High-Side Buck Evaluation Module

Test Equipment

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8 Test Equipment

AC Input Source: The input source is an isolated variable AC source capable of supplying between 85

VRMS and 265 VRMS at no less than 5 W and connected as shown in Figure 2. For accurate efficiency

calculations, a power meter (PM1) should be inserted between the AC source and the EVM. For highest

accuracy, connect the voltage terminals of the power meter directly across the power source. (Connecting

the voltage terminals directly to the EVM results in a small current error. This is very significant when

measuring no-load power)

Load: The UCC28880EVM-616 is capable of delivering 100 mA of output current. 50 Ω, at 1 W is the

minimum value of load resistance for the 5-V output and 130 Ωat 5 W is the minimum value of load

resistance for the 13-V output. Alternatively an electronic load may be used.

NOTE: The output is not isolated from the AC and the electronic load must be capable of operating

from a high-voltage input.

Power Meter: The power analyzer (PM1) is capable of measuring low-input current, typically less than

100 µA, and a long averaging mode if low-power standby mode input power measurements are to be

taken. An example of such an analyzer is the Yokogawa WT210 Digital Power Meter.

Multimeters: Two digital multimeters are used to measure the regulated output voltage (DMM) and load

current (DMM ).

Oscilloscope: A digital or analog oscilloscope with a 500-MHz scope probe is recommended.

Recommended Wire Gauge: A minimum of AWG 24 wire is recommended. The wire connections

between the AC source and the EVM, and the wire connections between the EVM and the load should be

less than two feet long.

10 UCC28880EVM-616 High-Side Buck Evaluation Module SLUUB56A–July 2014–Revised August 2014

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