The ST company EVL6564-50WFLB is a 50W PFC power supply using the input voltage of L6564, which is suitable for all low power applications that require high PF such as illumination, LED power supply, etc., the line frequency is 47-63 Hz, the switching frequency is greater than 44kHz. The output voltage is only 24V, and the power coefficient of the load is greater than 0.9, and the efficiency of full load is greater than 88%. This article describes the main characteristics of the L6564, block diagram, using L6564 demo panel EVL6564-100W circuit diagram and 50W EVL6564-50WFLB evaluation board circuit diagram and material list.
The L6564 is a current mode PFC controller working on the transition mode (TM) represents a compact version of L6563S because it embeds the same drive, reference, and control level in a very compact 10-pin SO package.
Highly linear multipliers, plus a special correction circuit, reduces cross distortion of the power supply, even in a large load range, a wide range of power operations can be performed with extremely low THD.
The output voltage is controlled by a voltage mode error amplifier and an accurate internal reference voltage (1% @ Tj = 25 ° C). Voltage stability is optimized by volt feedforward function (1 / V2 correction), which uses proprietary technology in this IC, which can significantly improve line transients in the case of a power supply and surge ("two-way"). response.
In addition to controlling the overvoltage protection of the output voltage under transient conditions, IC also provides protection against feedback loop faults or error settings. Other board protection functions ensure safety handling of power saving and inductance saturation.
Totem column output grades can provide 600 mA source current and 800 mA of ambulance, suitable for high power MOSFET or IGBT drivers. Combined with other functions and the possibility of using ST-specific fixed shutdown time control functions, the device is made to have an excellent solution for the highest 400 W, requiring the EN61000-3-2 and Jeita-Miti standard SMPS.
L6564 Main features:
■ Fast "two-way" input voltage feedforward (1 / V2 correction)
■ Accurate adjustable output overvoltage protection
■ Prevent feedback loop disconnect (latch stop)
■ Inductive saturation protection
■ AC power-down detection
■ Low (≤100μA) start current
■ Maximum 6 mA work bias current
■ 1% (@ TJ = 25 ° C) internal reference voltage
■ -600 / + 800 mA Totem pole gate driver, with active pull-up during UVLO
■ SSOP10 package
L6564 main application:
■ PFC pre-adjuster for:
- High-end AC-DC Adapter / Charger
- Desktop PC, Server, Web Server
- SMPS in accordance with IEC61000-3-2 or Jeita-Miti standards
■ SMPS for LED lamps
Figure 1.L6564 block diagram
Figure 2. Demo board EVL6564-100W circuit diagram with L6564
50W EVL6564-50WFLB Evaluation Board
EVL6564-50WFLB Demo Board can implement 50 W wide-range main power input, corrected power factor, suitable for all low-power applications that require high power, such as lighting applications, LED power, etc. It can provide a very competitive solution by combining a low-cost device such as L6564) and a simple topology (such as anti-transistive).
The main feature of the converter is that the input current is almost in phase with the power supply voltage. Therefore, the power factor is close to 1. This is achieved by the controller L6564 which is formed into a sine wave with the same phase as the power supply voltage.
The main features of the EVL6564-50WFLB evaluation board:
■ Line voltage range: 90 to 265 Vac
■ Minimum line frequency (fl): 47-63 Hz
■ Minimum switching frequency: 44 kHz
■ Reflective voltage: 140 V
■ Adjust the output voltage: 24 V
■ Rated output power: 50 w
■ Power factor (load ≥ 50%): 0.9 lowest
■ Minimum efficiency at full load: 88%
■ Maxim micron 2FL output voltage ripple: 1.1V peak value (VIN = 230 Vac, Pout = 50W)
■ Maximum ambient temperature: 50 ° C
■ Communicate EMI: Compliance with EN55022 C
■ PCB type and size: single side, 35μm, CEM-1,140 x 60 mm
Figure 3. Evl6564-50wflb evaluation board proof
Figure 4. Evl6564-50wflb evaluation board circuit diagram
EVL6564-50WFLB evaluation board material list (BOM):
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