ST STEVAL-USBPD45H User Manual

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User manual

Getting started with the 45 W wall adapter solution for USB

Type-C Power Delivery

Introduction

This board has been physically tested and validated; it is not for sale. This USB Power Delivery wall adapter is a USB-IF certified solution with a 45 W isolated power supply

with USB Power Delivery controller. This USB Type-C PD wall power adapter design is for universal line voltage applications based on the

STCH02 Primary controller and STUSB4700 USB PD controller. The 5 V, 9 V and 15 V USB output voltage profiles all have a 3 A rating. The offline power supply is implemented in an isolated flyback topology based on the STCH02 quasi-

resonant controller with ultra-low standby power consumption. The USB Power Delivery (PD) is managed by the STUSB4700 and is Type-C compatible: power negotiation, Vbus discharge, protections, etc. are entirely managed by the IC.

The USB power supply architecture connects a power board with a controller board. This design optimizes the form factor and lets you scale the power section up or down to suit different USB Power Adapter applications.

Figure 1: STEVAL-USBPD45H evaluation board

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Contents

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Contents

1 STEVAL-USBPD45H board description ......................................... 5

1.1 Main characteristics .......................................................................... 5

2 Schematics and list of components ............................................... 6

3 Description of main components ................................................. 11

3.1 STUSB4700 stand-alone USB PD controller with integrated

discharge path (control board component U1) ............................................. 11

3.2 STCH02 offline PWM quasi resonant controller for ultra-low standby

power supplies (power board component U3) .............................................. 11

3.3 Flyback transformer (power board component T1) ......................... 11

3.4 Other components ........................................................................... 12

4 Layout of the PCB ......................................................................... 14

5 Electrical safety ................................................................ ............. 16

6 Getting started with the STEVAL-USBPD45H .............................. 17

6.1 Host system: P-NUCLEO-USB002 USB Type-C expansion pack ... 17

6.2 System setup .................................................................................. 18

6.3 Connect STEVAL-USBPD45H and load test .................................. 19

6.4 Profile change request .................................................................... 20

6.5 Configuration of STUSB4700 standalone USB PD controller ......... 21

7 Test measurement reports ............................................................ 23

7.1 STEVAL-USBPD45H efficiency measurements .............................. 23

7.2 STEVAL-USBPD45H voltage profile transition measurements ....... 25

7.2.1 Positive output voltage transitions (5 V to 15 V) .............................. 25

7.2.2 Negative output voltage transitions (15 V to 5 V) ............................. 27

7.3 STEVAL-USBPD45H conducted EMI measurements ..................... 28

7.4 STEVAL-USBPD45H thermal measurements ................................. 30

8 Revision history ............................................................................ 32

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List of tables

Table 1: Power board bill of materials ........................................................................................................ 7

Table 2: Control board bill of materials ....................................................................................................... 9

Table 3: Electrical specifications (at 25°C unless otherwise specified) .................................................... 12

Table 4: Primary-Secondary Isolation elements - key parameters ........................................................... 16

Table 5: Efficiency measurement for 5 V at 120 VAC line voltage ............................................................. 23

Table 6: Efficiency measurement for 15 V at 120 VAC line voltage ........................................................... 24

Table 7: Efficiency measurement for 5 V at 230 VAC line voltage ............................................................. 24

Table 8: Efficiency measurement for 5 V at 230 VAC line voltage ............................................................. 25

Table 9: Positive voltage transition results ............................................................................................... 26

Table 10: Negative voltage transition results ............................................................................................ 28

Table 11: Document revision history ........................................................................................................ 32

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List of figures

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List of figures

Figure 1: STEVAL-USBPD45H evaluation board ....................................................................................... 1

Figure 2: Power board schematic diagram ................................................................................................. 6

Figure 3: Control board schematic diagram ............................................................................................... 9

Figure 4: Flyback transformer ................................................................................................................... 12

Figure 5: Power board PCB layout (top) ................................................................................................... 14

Figure 6: Power board PCB layout (bottom) ............................................................................................. 14

Figure 7: Control board PCB layout (top) ................................................................................................. 14

Figure 8: Control board PCB layout (bottom) ........................................................................................... 15

Figure 9: P-NUCLEO-USB002 STM32 Nucleo Pack for USB Type-C expansion ................................... 17

Figure 10: P-NUCLEO-USB002 Nucleo Pack with USB1602 Expansion Board ..................................... 18

Figure 11: Setting up the complete testing environment .......................................................................... 19

Figure 12: STUSB graphical user interface tool ....................................................................................... 21

Figure 13: Efficiency measurement at 120 VAC line voltage ..................................................................... 23

Figure 14: Efficiency measurement at 230 VAC line voltage ..................................................................... 24

Figure 15: Output voltage transition 5 V to 15 V - no load ....................................................................... 25

Figure 16: Output voltage transition 5 V to 15 V - full load ....................................................................... 26

Figure 17: Positive voltage transition ........................................................................................................ 26

Figure 18: Output voltage transition 15 V to 5 V - no load ....................................................................... 27

Figure 19: Output voltage transition 15 V to 5 V - full load ....................................................................... 27

Figure 20: Negative voltage transition ...................................................................................................... 28

Figure 21: EMI results at full load (45 W), 120 VAC ................................................................................... 29

Figure 22: EMI results at half load (22.5 W), 120 VAC .............................................................................. 30

Figure 23: Thermal map at full load .......................................................................................................... 31

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STEVAL-USBPD45H board description

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1 STEVAL-USBPD45H board description

1.1 Main characteristics

 USB wall power adapter input: 85 VAC to 264 VAC  USB voltage output: 5 V, 9 V and 15 V  Current limit: 3 A for all voltage level profiles  Load power limited to 45 W  Cable compensation  Isolated quasi-resonant flyback  Efficiency 90% (approx.)  USB Type-C Power Delivery compatible  USB-IF certified

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Schematics and list of components

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2 Schematics and list of components

To improve form factor, the solution is integrated on two separate boards: one for the offline flyback converter and one for the USB control.

Figure 2: Power board schematic diagram

220K

Schematic values for 5V, 12V, 15V

Vout

1Pin .100 Header

LINE

GND

C18

STTH1R06A

R29

R10

1Pin .100 Header

Qc1

CC2

1.5nF-100V

VBUS_DISCH

BSS138

SENSE

ZCDAUX

REF

2.86K 1%

Short out

-X 275V

100nF

0.03

DRAIN

R38

R34 R35

STCH02

VBus

GND

R15

22K

D51N4148W

R35

R30

1Pin .100 Header

I_PDO3

C12

VDD

GND

22uF 50V

2KBP06M

GND

PDO3

NEUTRAL

VBUS_EN_SRC

GND

220

100uH

VOUT_HI_LOAD

GND_OUT

220K 1%

R27

VDD

Vout

2.2nF -1KV

R22

68uF-400V

20K

CATHODE

STS10P3LLH6

R20

GND_OUT

LINE

C10

R39

STF10LN80K5

0.25R

CC1

9V: 7.5K 63.4K

22K 1%

GND

Rc1

STS5P3LLH6

GND

R33

1.6k

4R7

15V

SFH617-A2

VBus

9.1K 1%

PDO2PDO3

R11

QSW1

NEUTRAL

U4A

33R

GND_OUT

100K

GND_OUT

R34

C13

QD1

VDD

R18

VBUS_EN_SRC

PDO2

R19

strip line conn

R12

R16

V_Current_Sense

123456789

R21

0.33R

R38 R39

9V: 16.2K 150K

12V: 22k

150K 1%

GND

R24

2.2nF -Y

1Pin .100 Header

C15

V_Current_Sense

220pF

not in layout

R26

TLVH431

360K

R32

U4B

R25

12V: 2.86k 27K

GND_OUT

R31

GND_OUT

4R7

GND_OUT

C17

GND

R23

1Pin .100 Header

GND

R36

10mH

ZCD

BC847C

27K 1%

SFH617-A2

R14

100nF

DNM

Sumida T91402B

C142NM

12K

CC1

GAT1E

GND

R13

10k

VBUS_DISCH

GND

SENSE

V_Current_Sense

C16

RM1

R17

2.5A-F-250V

Vout

GND

470K 1%

100K 1%

R28

22uF 50V

10uF 25V

BAV103

C11

30K

GND

3.9

680uF-25V

VBus

GND

47k

FERD20H100STS

33nF

not in layout

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Table 1: Power board bill of materials

Item

Q.ty

Ref.

Part/Value

Description

Manufacturer

Order code

1 1 C6

2.2 nF 1 KV 1206

Capacitor

Murata

490-3496-1

2 1 C7

100 nF X 275 V BOXCAP18.5X7.0LS15. 0

Capacitor

EPCOS

495-1389-ND 3 1 C8

68 µF 400 V CAPE Laydown 18DX7.5LS+L

Capacitor

Rubycon

1189-3150

4 1 C9

680 µF 25 V CAPE10DX5LS

Capacitor

Rubycon

1189-1855

5 1 C10

10 µF 25 V CAPE5.0DX2.5LS

Capacitor

Kemet

A758BG106M1EAAE070

-ND 6 1

C11

1.5 nF 100 V 1206

Capacitor

AVX

478-1451-6

7 1 C12

100 nF 0603

Capacitor

Any

8 1 C13

220 pF 0603

Capacitor

Any

9 1 C15

33 nF 0603

Capacitor

Any

10 1 C16

2.2 nF -Y DISCAP7.0X5.0LS7.5

Capacitor

Murata

490-9459

C17, C18

22 µF 50 V CAPE5DX2.0LS

Capacitors

Rubycon

1189-1853

12 1 D2

2KBP06M 2KBP06M

Bridge rectifier

Vishay

625-2KBP06M-E4/51

13 1 D3

STTH1R06A SMA

Turbo 2 ultrafast high voltage rectifier

STTH1R06A

14 1 D4

FERD20H100STS TO220INLINE

100 V fieldeffect rectifier diode

FERD20H100STS 15 1 D5

1N4148W SOD123

Fast switching diode

Vishay

1N4148WS 16 1 D6

BAV103 SOD123

Diode

Vishay

BAV103-GS18CT

17 1 D7

15 V SOD123

Diode

Micro Commercial

SMAJ4744ATPCT

18 1 F1

2.A -F-250 V SS-5F BK

Fuse

Bussmann/Eato n

SS-5F-2.5A

19 1 L1

10 mH 744841210

Leaded inductor

Wurth Elektronik

744821110

20 1 L2

100 µH 744841210

Inductor

Wurth Elektronik

744841210 21 1 P2

HDR1X12

Samtec

HDR1X12

22 1 Q2

STF10LN80K5 TO220FP

Power MOSFET

STF10LN80K5

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Item

Q.ty

Ref.

Part/Value

Description

Manufacturer

Order code

23 1 Q3

BC847C SOT23

Generalpurpose transistor

Nexperia

BC847 24 1 Qc1

BSS138 SOT23_FET

N-Channel transistor

Fairchild

BSS138KCT

25 1 QD1

STS5P3LLH6 NFET_SO8

Power MOSFET

STS5P3LLH6

QSW1 STS10P3LLH6 NFET_SO8

Power MOSFET

STS10P3LLH6 27 1 R9

100 K 1206

Resistor

Any

28 1 R10

NC 1206

Resistor

Any

29 1 R11

33 R 1206

Resistor

Any

30 1 R12

10 k 0603

Resistor

Any

31 1 R13

47 k 0603

Resistor

Any

32 1 R14

0 R

Jumper

Any

33 1 R15

220 SM/R_2010

Resistor

Yageo

YAG3386CT-ND

34 1 R16

1.6 K 1210

Resistor

Any

R17, R20, R28

1 k 0603

Resistor

Any 36 1 R18

0.03 SM/R_2010

Resistor

Stackpole Electronics

CSRN2010FK30L0CTND

R19, R33

4R7 0805

Resistor

Any 38 1 R22

30 K 0603

Resistor

Any

39 1 R23

12 K 0603

Resistor

Any

40 1 R24

0.25 R 1206

Resistor

Stackpole Electronics

CSR1206FKR330CT-ND

41 1 R25

0.33 R 1206

Resistor

Stackpole Electronics

CSR1206FKR330CT-ND 42 1 R26

100 K ±1% 0603

Resistor

Any

43 1 R27

360 K 0603

Resistor

Any

44 1 R29

22 K 0603

Resistor

Any

45 1 R31

150 K ±1% 0603

Resistor

Any

46 1 R32

9.1 K ±1% 0603

Resistor

Any

47 1 R34

7.5 K ±1% 0603

Resistor

Any

48 1 R35

63.4 K ±1% 0603

Resistor

Any

49 1 R36

20 K 0603

Resistor

Any

50 1 R38

16.2 K ±1% 0603

Resistor

Any

51 1 R39

150 K ±1% 0603

Resistor

Any

52 1 Rc1

470 K ±1% 0603

Resistor

Any

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Item

Q.ty

Ref.

Part/Value

Description

Manufacturer

Order code

53 1 RM1

NM MOV5X7LS5

Resistor

Any

54 1 T1

Sumida T91402B

Power inductor

Sumida

Sumida T91402B

55 1 U3

STCH02 SO8

PWM quasi resonant controller

STCH02 56 1 U4

SFH617-A2 HPCL-B17560E OPTOCOUP_SM

Optocoupler

Vishay

SFH617-A2

57 1 U6

TLVH431 TL432_SOT23-3

Adjustable shunt voltage reference

TLVH431 58

Heats ink

6043PBG 25.4 mm x

20.32 mm

Heat sink

Aavid Thermalloy

6043BG-ND

Figure 3: Control board schematic diagram

Table 2: Control board bill of materials

Item

Q.ty

Ref.

Part/Value

Description

Manufacturer

Order code

C1, C2, C21

1µ X7R 0805

Capacitors

Any 2 1 C4

100 n 0805

Capacitor

Kemet

C0805C104K5RACTU

VBus

VBUS_DISCH

Vout

1µ X7R

GND

1 2 3 4 5 6 7 8

9 10 11 12

strip line conn

GND

VBUS_EN_SRC

2V7

GND

Connect exposed PAD to GND

Vout

VBUS_DISCH

VBus

PDO3PDO2

CC1

CC2

GND

VBUS_EN_SRC

V_Current_Sense

-V

Out

TS881ILT

2V7

GND

CC1

CC2

PDO3

PDO2

R6 0

C4 100n

GND

R4 1k

V_Current_Sense

R3 100k 1%

3.01k 1%

R21 1k 1%

GND

1V2

R31 0k

R1 100

C5 10n

GND

1 2 3

Header 3

GND

SCL SDA

SCL

SDA

D2 ESDA25L

GND

VOUT_HI_LOAD

1V2

R2 10k

GND

C21

GND

CC1

CC2

RESET

SCL7SDA8ALERT#9GND10ISEL_PDO311ISEL_PDO2

ADDR0

VSEL_PDO2

VSEL_PDO3

A_B_SIDE

VBUS_SENSE

Vbus_disch

Vbus_en_src

VREG_1V2

VSYS

VREG2V7

VDD

U1 STUSB4700GND

1µ X7R

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Schematics and list of components

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Item

Q.ty

Ref.

Part/Value

Description

Manufacturer

Order code

3 1 C5

10 n 0805

Capacitor

Any

4 1 D2

ESDA25L SOT-23

Dual Transil™

array for ESD protection

ESDA25L 5 1 R1

100 0603

Resistor

Any 6 1

10 k 0603

Resistor

Any

7 1 R3

100 k ±1% 0603

Resistor

Any

R4, R8

1k 0603

Resistor

Any

9 1 R5

3.01 k ±1% 0603

Resistor

Any 10 1 R6

0 0603

Resistor

Any

11 1 R21

1 k ±1% 0603

Resistor

Any

12 1 R31

0 k 0603

Resistor

Any

13 1 U1

STUSB4700 QFN24_L

Stand-alone USB power delivery controller

STUSB4700

14 1 U2

TS881 SOT23-5

Rail-to-rail 0.9V nanopower single comparator

TS881

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3 Description of main components

3.1 STUSB4700 stand-alone USB PD controller with integrated discharge path (control board component U1)

This fully hardware integrated USB power delivery controller is compliant with USB Type-C r1.2 and certified as USB PDr2.0. The solution is entirely hardware based and requires no embedded software development. The protocol uses configuration channel pins (CC) to negotiate the requested power profile.

The device can be configured via the I2C interface for up to 5 power profiles, with selectable current, voltage and configurable transition characteristics, including V

BUS

discharge. The device manages communication and power profile control in line with USB PD 2.0

standard, including the following functionality:

 Detects connection between two USB ports (attach detection)  Establishes a valid host to device connection  Discovers and configures VBUS: Type-C low, medium or high current mode  Resolves cable orientation  Negotiates a USB power delivery contract with a PD capable device  Configures the power source accordingly  Monitors V

BUS

, manages transitions, handles protections and ensures user and device

safety

3.2 STCH02 offline PWM quasi resonant controller for ultra-low standby power supplies (power board component U3)

This quasi-resonant controller with primary side constant current (CC) regulation is specifically designed for AC/DC chargers and adapters for smart phones, tablets and other handheld personal electronics applications. The IC uses optocoupler feedback for secondary side voltage regulation which ensures safety isolation from the high voltage side. STCH02 features a 650 V integrated start-up circuit, adjustable output over-voltage protection, frequency jitter for EMI suppression and ultra-low power consumption.

The device is supplied from an auxiliary winding of the transformer. Because of the wide range of possible output voltage profile settings, a simple regulator (Q3 and D7) is required to ensure VDD does not exceed 23 V (V

DDmax

) at 15 V output voltage.

R27 and R29, the zero-current detection network (ZCD) senses demagnetization of the transformer, which is used for quasi-resonant operation. Overvoltage protection is also triggered according to the voltage information sampled via this pin. Primary current is sensed with series resistor pair R24 and R25 for current control, ensuring output voltage fold-back at maximum load current (above 3 A).

3.3 Flyback transformer (power board component T1)

The transformer is custom made by Sumida. The core used is an RM10 type.

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Description of main components

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Figure 4: Flyback transformer

Table 3: Electrical specifications (at 25°C unless otherwise specified)

Parameter

Conditions

Value

Units

Tolerance

Inductance (OCL)

(1-3) 0.1Vrms, 10KHz

600

µH

±15%

DCR (PRI)

(1-3)

0.380 Ω MAX

DCR (SEC)

(A-B)

16.00

mΩ

MAX

DCR (AUX)

(4-5)

0.640 Ω MAX

Leakage Inductance

(LL)

(1-3) [tie 4+5, A+B], 0.1Vrms,

100KHz

8.0

µH

MAX

Turns Ratio

(1-3) : (A-B)

5.2:1

N/A

±2%

Turna Ratio

(1-3) : (4-5)

2.6:1

N/A

±2%

HI-POT

(1,2,3,4,5) : (A,B)

3000

Vrms

2S, 1mA,

50/60Hz

3.4 Other components

STF10LN80K5 (Power board component Q2): 800 V N-channel Power MOSFET

designed using MDmesh™ K5 technology. Its very low on-resistance of 0.63 Ω (max) and ultra-low gate charge is very well suited for this application and helps achieve high efficiency.

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FERD20H100STS (Power board component D4): 100 V/20 A secondary side FERD

rectifier with low forward voltage, low leakage current; appropriate for high frequency switching applications.

STTH1R06 (Power board component D3): 600 V/1 A ultrafast soft recovery diode forming

part of the RCD peak clamp circuit.

TLVH431 (Power board component U6): 1.24 V voltage reference used as part of the

feedback error amplifier.

STS10P3LLH6 (Power board component QSW1): PMOS load switch with minimal on-

resistance to minimize conduction losses at high load current. It is a 12 A device with 12m Ω drain-source resistance.

TS391 (Power board component U2): Nano-power rail-to-rail comparator with push-pull

output used for cable drop compensation. At load currents higher than 1.5 A, the comparator output activates a MOSFET that changes the feedback divider of the flyback that sets output voltage.

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Layout of the PCB

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4 Layout of the PCB

Figure 5: Power board PCB layout (top)

Figure 6: Power board PCB layout (bottom)

Figure 7: Control board PCB layout (top)

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Figure 8: Control board PCB layout (bottom)

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Electrical safety

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5 Electrical safety

The STEVAL-USBPD45H solution is designed to comply with UL and other safety standards, but is nonetheless only intended for functional demonstration purposes. ST reference designs and demonstration boards are intended to help and facilitate development of products. Using a direct copy of any of them does not waive the requirement for testing and certification of products mandated by the governing agencies and authorities.

The power supply solution is implemented in isolated flyback topology. The secondary lowvoltage side is isolated from the high-voltage primary side by the transformer, opto-coupler, Y-capacitor and minimum creepage between copper tracks on either side.

Table 4: Primary-Secondary Isolation elements - key parameters

Transformer

Hi-Pot Isolation

3000 VRMS, 50/60Hz

Tested 2s

Y cap

Y2 Rated

250VAC

2000V lead dielectric strength

Copper Track Creapage

200 mil

(5mm)

1000VDC

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6 Getting started with the STEVAL-USBPD45H

6.1 Host system: P-NUCLEO-USB002 USB Type-C expansion pack

To evaluate the full functionality of the STEVAL-USBPD45H, a compatible USB Type-C host device must be used in conjunction with the evaluation board.

Figure 9: P-NUCLEO-USB002 STM32 Nucleo Pack for USB Type-C expansion

The P-NUCLEO-USB002 is an STM32 Nucleo USB Type-C expansion pack that supports USB PD Stack. The development kit includes the following boards:

1. The NUCLEO-F072RB development board with embedded software compliant with

USB Type-C (Rev 1.2) and Power Delivery (Rev. 2.0). Visit the NUCLEO-F072RB product folder to download the necessary firmware drivers.

2. The P-NUCLEO-USB002 expansion board is based on the STUSB1602 Type-C

controller and has two full-featured USB Type-C ports configurable for Provider, Consumer or DRP roles.

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Figure 10: P-NUCLEO-USB002 Nucleo Pack with USB1602 Expansion Board

6.2 System setup

On NUCLEO-F072RB board, verify jumper settings:

 JP1 closed  JP5 (PWR) set to U5V  JP5 closed (IDD)

On the P-NUCLEO-USB002 expansion board, verify jumper settings:

 JP400 closed  JP000 closed on pins 1-2

Connect the NUCLEO-F072RB to a PC using a USB Type-A to Mini-B cable (not provided)

Connect the NUCLEO-F072RB serial coms (RX/TX) to the P-NUCLEO-USB002 expansion board.

The two blue LEDs identify the role of each of the two ports – blink once for Provider, twice for Consumer, and three times for DRP role

Connect the STEVAL-USBPD45H to either of the two Type-C receptacles

The two orange LEDs light up when a cable is detected in port 0 or 1 respectively, and blink once or twice depending on cable orientation

Two green LEDs blink when Vbus is detected

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6.3 Connect STEVAL-USBPD45H and load test

The AC Mains connection to the STEVAL-USBPD45H evaluation board accepts a wide range of voltages from 85 VAC to 265 VAC.

For safety reasons, you should connect the board via an isolating transformer, considering the exposed components and tracks on the board and the fact that it is intended for electrical evaluation.

Figure 11: Setting up the complete testing environment

The STEVAL-USBPD45H is connected to the P-NUCLEO-USB002 board via the USB Type-C captive cable. You can connect to either of the two available ports (Port 0 or 1). The USB expansion board connector is a good point for voltage measurements as it accurately represents cable drop losses and voltage drops at end of the USB cable.

The load range of the STEVAL-USBPD45H is 0 A to 3 A for all 3 voltage profiles. For load currents above 3 A, current protection is activated to limit load power and ultimately disconnect the output. Further reconnection will initiate the default 5 V output setting.

You can use either an active load, as shown in Figure 11: "Setting up the complete testing

environment", or a resistive load. In both cases, they have to be rated for the tested power

level.

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6.4 Profile change request

A simple software terminal emulator for serial port communication, such as Tera Term (freeware) can be used to send configuration status queries and profile change commands.

Set up the serial port emulator for STMicroelectronics ST-LINK and install the Nucleo drivers.

Select the right baud rate in the serial port setup menu.

Communication should be established.

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Use the following commands to request output profile change:

 p 0/1 – shows the programmed profile for port 0 or 1  r 0 1/2/3 – request change to profile 1, 2 or 3 (for port 0 – 5V, 9V, 15V

respectively)

6.5 Configuration of STUSB4700 standalone USB PD controller

The STUSB4700 standalone USB PD controller is configurable via a simple GUI interface. You can download the GUI and corresponding installation guide from STSW-STUSB001

or from the STUSB4700 product page under the TOOLS AND SOFTWARE tab. The NVM configuration lets you modify PDO (output profile) settings including current and

voltage, number of PDOs, discharge mechanism, undervoltage and overvoltage tolerances and settling time.

Figure 12: STUSB graphical user interface tool

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To run the GUI on a Windows laptop, you can use a standard NUCLEO-F072RB as a USB to I²C interface between the USB port on your PC to the I²C port on the STUSB4700.

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7 Test measurement reports

7.1 STEVAL-USBPD45H efficiency measurements

All tests were performed using the P-NUCLEO-USB002 expansion board. All measurements were taken at room temperature after at least 20 minutes of operation to minimize the effect of transformer core warm up.

The efficiency of the solution was tested at the following typical line voltages:

 120 VAC (see Figure 13: "Efficiency measurement at 120 VAC line voltage")

 efficiency for load current at 5 V - Table 5: "Efficiency measurement for 5 V at

120 VAC line voltage"

 efficiency for load current at 15 V - Table 6: "Efficiency measurement for 15 V at

120 VAC line voltage"

 230 VAC (see Figure 14: "Efficiency measurement at 230 VAC line voltage")

 efficiency for load current at 5 V - Table 7: "Efficiency measurement for 5 V at

230 VAC line voltage"

 efficiency for load current at 15 V - Table 8: "Efficiency measurement for 5 V at

230 VAC line voltage"

Voltage measurements were taken at the output capacitor and did not account for output load switch and cable drops.

 No Load Power – only tested at 5 V output (power adapter always defaults to 5 V

output when host device is disconnected).

 7.5 mW at 120 VAC  12 mW at 230 VAC

Figure 13: Efficiency measurement at 120 VAC line voltage

Table 5: Efficiency measurement for 5 V at 120 VAC line voltage

Pin, W

Iout, A

Vout, V

Pout, W

Efficiency, %

0.82

0.13

5.23

0.6799

82.9

3.26

0.527

5.23

2.75621

84.5

6.29

1.035

5.22

5.4027

85.9

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Pin, W

Iout, A

Vout, V

Pout, W

Efficiency, %

12.2

2.035

5.22

10.6227

87.1

15.32

2.543

5.22

13.27446

86.6

17.5

2.892

5.21

15.06732

86.1

18.41

3.036

5.22

15.84792

86.1

Table 6: Efficiency measurement for 15 V at 120 VAC line voltage

Pin, W

Iout, A

Vout, V

Pout, W

Efficiency, %

2.46

0.13

15.53

2.0189

82.1

9.25

0.527

15.51

8.17377

88.4

17.76

1.035

15.5

16.0425

90.3

34.54

2.035

15.46

31.4611

91.1

43.35

2.543

15.47

39.34021

90.8

49.5

2.892

15.48

44.76816

90.4

51.23

3.036

15.34

46.57224

90.9

Figure 14: Efficiency measurement at 230 VAC line voltage

Table 7: Efficiency measurement for 5 V at 230 VAC line voltage

Pin, W

Iout, A

Vout, V

Pout, W

Efficiency, %

0.87

0.13

5.22

0.6786

78.0

3.47

0.527

5.2

2.7404

79.0

6.54

1.035

5.18

5.3613

82.0

12.35

2.035

5.18

10.5413

85.4

15.44

2.543

5.19

13.19817

85.5

17.45

2.892

5.19

15.00948

86.0

18.3

3.036

5.19

15.75684

86.1

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Table 8: Efficiency measurement for 5 V at 230 VAC line voltage

Pin, W

Iout, A

Vout, V

Pout, W

Efficiency, %

2.71

0.13

15.49

2.0137

74.3

9.57

0.527

15.42

8.12634

84.9

18.02

1.035

15.39

15.92865

88.4

34.52

2.035

15.35

31.23725

90.5

42.89

2.543

15.35

39.03505

91.0

48.7

2.892

15.35

44.3922

91.2

51.11

3.036

15.36

46.63296

91.2

7.2 STEVAL-USBPD45H voltage profile transition measurements

Full USB-PD compliance measurements were performed for the USB-IF certification workshop. The following positive and negative voltage transitions waveforms illustrate some of the critical timing requirements.

7.2.1 Positive output voltage transitions (5 V to 15 V)

Figure 15: Output voltage transition 5 V to 15 V - no load

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Figure 16: Output voltage transition 5 V to 15 V - full load

Figure 17: Positive voltage transition

Table 9: Positive voltage transition results

Parameter

Specification

Measurement

Unit

tSrcSettle

275 max

44 @ 3 A 42 @ 0 A

vSrcSlewPos

30 max

1 @ 3 A

2.7 @ 0 A

mV/µs

vSrcNew

0.95 to 1.05 of final voltage (14.25 to 15.75)

14.88 @ 3 A

14.75 @ 0 A

V vSrcValid

No overshoot

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7.2.2 Negative output voltage transitions (15 V to 5 V)

Figure 18: Output voltage transition 15 V to 5 V - no load

Figure 19: Output voltage transition 15 V to 5 V - full load

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Figure 20: Negative voltage transition

Table 10: Negative voltage transition results

Parameter

Specification

Measurement

Unit

tSrcSettle

275 max

41 @ 3 A 48 @ 0 A

vSrcSlewPos

30 max

2 @ 3 A 2 @ 0 A

mV/µs

vSrcNew

0.95 to 1.05 of final voltage (4.94 to 5.46)

5.08 @ 3 A

5.26 @ 0 A

V vSrcValid

±0.5 V from SrcNew

No overshoot

7.3 STEVAL-USBPD45H conducted EMI measurements

The STEVAL-USBPD45H evaluation board was tested for compliance with EMI EN55022 Class B standard.

Different were performed at different output voltage profile and power. Testing at different power levels is important due to the quasi-resonant principle of operation of the flyback controller, which results in different switching frequencies depending on load.

Testing was performed with Quasi-Peak and Average type detectors, and both pass with a sufficient margin below the respective EN55022 Class B limits.

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Figure 21: EMI results at full load (45 W), 120 VAC

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Figure 22: EMI results at half load (22.5 W), 120 VAC

For both full and half loads, at all frequencies where the Peak detector measurement violates either one of the limits, it then passes when retested with quasi-peak and average detector tests, in compliance with EN55022 standard.

7.4 STEVAL-USBPD45H thermal measurements

The thermal map at full load measured at 120 VAC at room temperature is shown in Figure

23: "Thermal map at full load". Temperature measurements were taken with a FLIR camera

at room temperature. In the thermal image below, neither the MOSFET nor the FERD diode have heatsinks to

help dissipate power losses, which can be considered a worst case scenario for the evaluation board. In any case, the components only experience a moderate temperature rise due to minimized losses.

Considering the diode can operate safely up to 175 °C and the MOSFET up to 150 °C, the temperature range of this power brick solution can be very wide.

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Figure 23: Thermal map at full load

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Revision history

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8 Revision history

Table 11: Document revision history

Date

Version

Changes

01-Dec-2017

Initial release

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