ST STDES-65ACFADP Specification sheet

Introduction

This document reports the functional, thermal, EMI, and efficiency measurements results for the STDES-65ACFADP 65 W

active clamp flyback adaptor reference design for USB Type-C™ PD source applications. This reference design meets CoC Tier

2 and DoE Level 6 efficiency requirements with a peak efficiency of 93.7% at full load.

The STDES-65ACFADP adopts the planar transformer technology, with an integrated GaN-based solution and digital control.

The reference design main devices are:

•ST-ONE: a programmable digital controller for the active clamp flyback primary high-low side GaN HEMT control plus a

secondary synchronous rectifier MOSFET control and USB-PD control;

•MASTERGAN2: a high-voltage enhancement mode GaN with a half-bridge configuration and integrated gate driver.

The STDES-65ACFADP is a fully assembled reference design developed for performance evaluation only, not available for sale.

STDES-65ACFADP test report

TN1402

Technical note

TN1402 - Rev 2 - November 2022

For further information contact your local STMicroelectronics sales office.

www.st.com

1Overview

The STDES-65ACFADP main features are:

• Universal input mains range: 90 Vac to 264 Vac - frequency 47 Hz to 63 Hz

• Output voltage range: 5 VDC - 20 VDC

• PD output:

– Five fixed PDOs: 5 V@3 A, 9 V@3 A, 12 V@3 A, 15 V@3 A, 20 [email protected] A

• Output power: 20 V - 3.25 A, 65 W max.

• Form factor: 54 mm (L)*31 mm (W)*25 mm (H)

• Efficiency: meets CoC Tier 2 and DoE Level 6 efficiency requirements, with a peak efficiency of 93.7% at

230 Vac 65 W

• Digital control for ACF primary and secondary sides

• Integrated GaN IC MASTERGAN2

• Compact, simplified PCB layout, and bill of material reduction

• EMC compliant: CISPR32B/EN55032B

• Planar transformer technology to achieve high-power density

Figure 1. STDES-65ACFADP architecture block diagram

Figure 2. STDES-65ACFADP reference design - top side

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Overview

TN1402 - Rev 2 page 2/35

Figure 3. STDES-65ACFADP reference design - bottom side

Fully assembled board developed for

performance evaluation only,

not available for sale

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Overview

TN1402 - Rev 2 page 3/35

2Specifications

Table 1. STDES-65ACFADP electrical specifications

Symbol Parameter Test conditions Minimum Nominal Maximum Unit

Input parameters

VIN Input line voltage 90 115/230 264 Vrms

fLINE Input line frequency 47 50/60 63 Hz

PSTBY No load input power (5 VOUT)

VIN = 115 VRMS, IOUT = 0 A

VIN = 230 VRMS, IOUT = 0 A

80 mW

PSTBY No load input power (9 VOUT)

VIN = 115 VRMS, IOUT = 0 A

VIN = 230 VRMS, IOUT = 0 A

170

180 mW

PSTBY

No load input power (12

VOUT)

VIN = 115 VRMS, IOUT = 0 A

VIN = 230 VRMS, IOUT = 0 A

220

260 mW

PSTBY

No load input power (15

VOUT)

VIN = 115 VRMS, IOUT = 0 A

VIN = 230 VRMS, IOUT = 0 A

280

290 mW

PSTBY

No load input power (20

VOUT)

VIN = 115 VRMS, IOUT = 0 A

VIN = 230 VRMS, IOUT = 0 A

180

220 mW

Output parameters - 5 V setting

VOUT Output voltage

VIN = 90 VRMS~264 VRMS

IOUT = 0 A~3 A 5 V

Vripple Output voltage ripple Peak-to-peak value with 20 MHz

bandwidth 180 250 mV

IOUT Output current 0 3 A

POUT Continuous output power 0 15 W

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 115 VAC and measured at the on-board

USB Type-C™ receptacle 90.2 %

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 230 VAC and measured at the on-board

USB Type-C™ receptacle 88.4 %

Output parameters - 9 V setting

VOUT Output voltage

VIN = 90 VRMS~264 VRMS

IOUT = 0 A~3 A 9 V

Vripple Output voltage ripple Peak-to-peak value with 20 MHz

bandwidth 152 250 mV

IOUT Output current 0 3 A

POUT Continuous output power 0 27 W

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 115 VAC and measured at the on-board

USB Type-C™ receptacle 91.2 %

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 230 VAC and measured at the on-board

USB Type-C™ receptacle 90.3 %

Output parameters - 12 V setting

VOUT Output voltage VIN = 90 VRMS~264 VRMS 12 V

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Specifications

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Symbol Parameter Test conditions Minimum Nominal Maximum Unit

IOUT = 0 A~3 A

Vripple Output voltage ripple Peak-to-peak value with 20 MHz

bandwidth 180 250 mV

IOUT Output current 0 3 A

POUT Continuous output power 0 36 W

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 115 VAC and measured at the on-board

USB Type-C™ receptacle 91.7 %

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 230 VAC and measured at the on-board

USB Type-C™ receptacle 91.5 %

Output parameters - 15 V setting

VOUT Output voltage

VIN = 90 VRMS~264 VRMS

IOUT = 0 A~3 A 15 V

Vripple Output voltage ripple Peak-to-peak value with 20 MHz

bandwidth 164 250 mV

IOUT Output current 0 3 A

POUT Continuous output power 0 45 W

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 115 VAC and measured at the on-board

USB Type-C™ receptacle 91.7 %

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 230 VAC and measured at the on-board

USB Type-C™ receptacle 91.8 %

Output parameters - 20 V setting

VOUT Output voltage

VIN = 90 VRMS~264 VRMS

IOUT = 0 A~3.25 A 20 V

Vripple Output voltage ripple Peak-to-peak value with 20 MHz

bandwidth 268 300 mV

IOUT Output current 0 3.25 A

POUT Continuous output power 0 65 W

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 115 VAC and measured at the on-board

USB Type-C™ receptacle 91.7 %

ηave

Four-point average efficiency

25%, 50%, 75%, and 100%

load

At 230 VAC and measured at the on-board

USB Type-C™ receptacle 92.1 %

Ambient and EMI parameters

TAMB Ambient temperature Free convection sea level 0 25 40 °C

EMI Conducted EMI Meets CISPR32B /EN55032

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Specifications

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3Test setup

3.1 Test conditions and equipment

• 1 x STDES-65ACFADP reference design

• 1 x 61604A programmable AC source by Chroma

• 1 x 63600-5 DC E-load by Chroma

• 1 x WT500 power analyzer by YOKOGAWA

• 1 x MSO44 mixed signal oscilloscope by Tektronix

• 1 x 8845A 6-1/2 digit precision multimeter by FLUKE

• 1 x P-NUCLEO-USB002 kit (sink emulator) to connect to the USB Type-C™ output to adjust the output

voltage

• Ambient temperature = 25°C

Figure 4. STDES-65ACFADP test setup

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Test setup

TN1402 - Rev 2 page 6/35

3.2 Procedure

Follow the steps below to test the reference design.

Step 1. Connect the STDES-65ACFADP USB Type-C™ output to the P-NUCLEO-USB002 kit via a USB

Type-C™ cable.

Step 2. Connect the P-NUCLEO-USB002 to a PC computer via a USB Type-A cable.

Step 3. Connect the AC source to the STDES-65ACFADP AC input L/N cables.

Step 4. Power up the STDES-65ACFADP with a 110 VAC or 230 VAC input to start the test.

Step 5. Adjust the output voltage through the P-NUCLEO-USB002.

Step 6. Adjust the output current through the E-load.

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Procedure

TN1402 - Rev 2 page 7/35

4Measurements/waveforms/test data

4.1 Efficiency test results

We tested the STDES-65ACFADP efficiency at 115 VAC and 230 VAC with different output voltages (5, 9, 12, 15,

and 20 V).

The obtained results show that our reference design meets the EU CoC Rev.05 Tier 2 and DoE Level 6

requirements with an adequate margin.

4.1.1 Efficiency at 115 VAC input

Figure 5. STDES-65ACFADP efficiency at 115 VAC input

Table 2. STDES-65ACFADP efficiency at 115 VAC input with different input voltages

Condition Percentage of full loading 5 V 9 V 12 V 15 V 20 V

EU CoC Rev.05-Tier2 limit for 10% loading - 72.48% 77.30% 78.30% 78.85% 78.85%

115 VAC 60 Hz input

10% 83.33% 84.92% 86.56% 86.45% 85.64%

25% 88.70% 89.83% 90.73% 90.73% 90.45%

50% 90.18% 91.32% 91.91% 91.89% 91.86%

75% 91.05% 91.39% 92.25% 92.21% 91.90%

100% 90.58% 91.90% 91.88% 91.95% 92.40%

Four-point average 90.13% 91.11% 91.69% 91.70% 91.65%

EU CoC Rev.05-Tier2 limit - 81.84% 87.30% 88.30% 88.85% 88.85%

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Measurements/waveforms/test data

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4.1.2 Efficiency at 230 VAC input

Figure 6. STDES-65ACFADP efficiency at 230 VAC input

Table 3. STDES-65ACFADP efficiency at 230 VAC input with different input voltages

Condition Percentage of full loading 5 V 9 V 12 V 15 V 20 V

EU CoC Rev.05-Tier2 limit for 10% loading - 72.48% 77.30% 78.30% 78.85% 78.85%

230 VAC 50 Hz input

10% 83.87% 84.14% 84.80% 84.07% 84.58%

25% 85.46% 87.90% 89.68% 90.00% 89.91%

50% 86.99% 89.74% 91.12% 91.43% 91.95%

75% 90.29% 91.20% 92.19% 92.42% 92.83%

100% 90.65% 92.11% 92.76% 93.01% 93.70%

Four-point average 88.35% 90.24% 91.44% 91.72% 92.10%

EU CoC Rev.05-Tier2 limit - 81.84% 87.30% 88.30% 88.85% 88.85%

4.2 Load and line regulation test results

Table 4. Load and line regulation at 5 VOUT

Loading (%) 115 VAC (V) 230 VAC (V) SPEC limit (V)

0 5.10 5.11

4.85 5.15

10 4.88 4.89

20 4.87 4.88

33 4.93 4.91

50 5.02 5.01

75 5.02 5.02

83 5.02 5.03

100 5.02 5.03

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Load and line regulation test results

TN1402 - Rev 2 page 9/35

Table 5. Load and line regulation at 9 VOUT

Loading (%) 115 VAC (V) 230 VAC (V) SPEC limit (V)

0 9.08 9.09

8.73 9.27

10 9.07 9.08

25 9.06 9.09

50 9.07 9.07

75 9.06 9.05

100 9.02 9.02

Table 6. Load and line regulation at 12 VOUT

Loading (%) 115 VAC (V) 230 VAC (V) SPEC limit (V)

0 12.05 12.08

11.64 12.36

10 11.85 11.86

20 11.87 11.87

50 11.88 11.89

75 11.87 11.90

100 11.85 11.88

Table 7. Load and line regulation at 15 VOUT

Loading (%) 115 VAC (V) 230 VAC (V) SPEC limit (V)

0 15.08 15.08

14.55 15.45

10 15.06 15.09

25 15.05 15.04

50 15.06 15.06

75 15.05 15.06

100 15.02 15.00

Table 8. Load and line regulation at 20 VOUT

Loading (%) 115 VAC (V) 230 VAC (V) SPEC limit (V)

0 20.05 20.06

19.4 20.6

10 20.03 20.03

25 20.02 20.03

50 20.01 20.02

75 20.01 20.01

100 20.00 20.00

4.3 Ripple and noise

4.3.1 Test setup of the VOUT ripple and noise

To test the VOUT ripple and noise, we added a 10 µF electrolytic capacitor and a 100 nF ceramic capacitor at the

end of the USB Type-C™ cable, as shown below.

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Ripple and noise

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