ST EVL150W-ADP-SR User Manual

EVL150W-ADP-SR

12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6599A and SRK2000

Features

■Universal input mains range: 90 to 264 Vac - frequency 45 to 65 Hz

■Output voltage: 12 V at 12.5 A continuous operation

■Mains harmonics: acc. to EN61000-3-2 class-D or JEITA-MITI class-D

■Standby mains consumption: <0.2 W at 230 Vac

■Efficiency at nominal load: better than 91% at 115 Vac

■EMI: according to EN55022-class-B

■Safety: according to EN60950

■Dimensions: 65x154 mm, 28 mm component maximum height

■PCB: double side, 70 µm, FR-4, mixed PTH/SMT

Description

The EVL150W-ADP-SR demonstration board is composed of two stages: a front-end PFC using the L6563H and an LLC resonant converter based on the L6599A and the SRK2000, controlling the SR MOSFETs on the secondary side. The SR driver and the rectifier MOSFETs are mounted on a daughterboard.

The characteristics of this design are the very high efficiency and the low consumption at light load which make it a viable solution for applications compliant with ENERGY STAR® eligibility criteria (EPA rev. 5.0 COMPUTER and EPA rev. 2.0 EPS). One of the key factors to achieve high efficiency at heavy load is the SRK2000. This synchronous rectification (SR) driver for LLC resonant converters allows a significant decrease of secondary side losses.

Standby consumption is at a lowest thanks to the sleep-in function embedded in the SRK2000 and the high voltage startup circuit integrated in the

Data brief

EVL150W-ADP-SR

L6563H. The possibility of driving the PFC burst mode via the L6599A PFC_STOP pin dramatically boosts light load efficiency.

Additionally, a secondary sensing circuit dedicated to driving into burst mode the primary controller reduces deviation of light load efficiency against resonant circuit parameter spread, improving the repeatability of the design in production volumes.

January 2012	Doc ID 022718 Rev 1	1/13
For further information contact your local STMicroelectronics sales office.		www.st.com

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EVL150W-ADP-SR	Efficiency measurement

2 Efficiency measurement

EPA rev. 2.0 external power supply compliance verification

Table 1 shows the no load consumption and the overall efficiency, measured at the nominal mains voltages. At 115 Vac the average efficiency is 90.6%, while at 230 Vac it is 91.8%. Both values are much higher than the 87% required by EPA rev2.0 external power supply (EPS) limits.

The efficiency at nominal load, 230 Vac is 94% which is a very high efficiency for a double stage converter and confirms the benefit of the implemented SR.

Also at no load the board performance is superior: maximum no load consumption at nominal mains voltage is 200 mW; this value is significantly lower than the 500 mW limit imposed by the ENERGY STAR® program.

Table 1.	Overall efficiency
			230 V-50 Hz							115 V-60 Hz
Test
	Vout	Iout		Pout		Pin	Eff.	Vout	Iout		Pout		Pin	Eff.
	[V]	[A]		[W]		[W]	[%]	[V]	[A]		[W]		[W]	[%]
No load	12.10	0.00		0.00		0.20		12.10	0.00		0.00		0.20
25%	12.14	3.10		37.63		43.15	87.2%	12.13	3.10		37.60		43.08	87.3%
load eff.
50%	12.14	6.19		75.15		81.30	92.4%	12.12	6.19		75.02		82.34	91.1%
load eff.
75%	12.08	9.37		113.19		120.81	93.7%	12.07	9.38		113.22		123.00	92.0%
load eff.
100%	12.04	12.47		150.14		159.79	94.0%	12.04	12.50		150.50		163.90	91.8%
load eff.
Average							91.8%							90.6%
eff.

Light load operation efficiency

Measurement results are reported in Table 2 and plotted in Figure 2. As seen, efficiency is better than 50% even for very light load such as 500 mW.

Table 2.		Light load efficiency
				230 V - 50 Hz							115 V - 60 Hz
Test
		Vout	Iout		Pout		Pin	Eff.	Vout	Iout		Pout		Pin	Eff.
		[V]	[mA]		[W]		[W]	[%]	[V]	[mA]		[W]		[W]	[%]
0.25 W		12.12	20.84		0.253		0.581	43.5%	12.12	20.84		0.253		0.565	44.7%
0.5 W		12.12	41.34		0.501		0.931	53.8%	12.12	41.34		0.501		0.912	55.0%
1.0 W		12.12	82.65		1.002		1.553	64.5%	12.12	82.65		1.002		1.552	64.5%

Doc ID 022718 Rev 1

3/13

Efficiency measurement														EVL150W-ADP-SR
Table 2.		Light load efficiency (continued)
				230 V - 50 Hz								115 V - 60 Hz
Test
		Vout	Iout		Pout		Pin		Eff.	Vout	Iout		Pout		Pin	Eff.
		[V]	[mA]		[W]		[W]		[%]	[V]	[mA]		[W]		[W]	[%]
1.5 W		12.12	123.93		1.502		2.203		68.2%	12.12	123.93		1.502		2.211	67.9%
2.0 W		12.12	164.93		1.999		2.797		71.5%	12.12	164.93		1.999		2.828	70.7%
2.5 W		12.12	206.75		2.506		3.392		73.9%	12.12	206.75		2.506		3.439	72.9%
3.0 W		12.11	248.00		3.003		3.979		75.5%	12.11	248.00		3.003		4.040	74.3%
3.5 W		12.11	288.25		3.491		4.560		76.6%	12.11	288.25		3.491		4.644	75.2%
4.0 W		12.11	330.06		3.997		5.155		77.5%	12.11	330.06		3.997		5.258	76.0%
4.5 W		12.11	372.31		4.509		5.748		78.4%	12.11	372.31		4.509		5.874	76.8%
5.0 W		12.11	413.34		5.006		6.327		79.1%	12.11	413.34		5.006		6.474	77.3%

Figure 2. Light load efficiency diagram

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4/13	Doc ID 022718 Rev 1