EVALSTSR30-60W STMicroelectronics, EVALSTSR30-60W Datasheet - Page 5

• Manufacturer Part Number: EVALSTSR30-60W
• Description: BOARD EVAL USING L6668 & STSR30
• Manufacturer: STMicroelectronics
• Type: AC/DC Switching Convertersr

Specifications of EVALSTSR30-60W

• Mfg Application Notes: EVALSTSR30-60W AppNote
• Main Purpose: AC/DC, Primary and Secondary Side
• Outputs And Type: 1, Isolated
• Power - Output: 60W
• Voltage - Output: 12V
• Current - Output: 5A
• Voltage - Input: 88 ~ 264VAC
• Regulator Topology: Flyback
• Frequency - Switching: 68kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6668, STSR30
• Input Voltage: 88 V to 264 V
• Output Voltage: 12 V
• Dimensions: 120 mm x 75 mm
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: L6668 And STSR30
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: SMPS
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6668, STSR30
• Other names: 497-6389; EVALSTSR30-60W

Adapter features
1
1.1
1.2
5/27
Adapter features
Main characteristics
The 60W AC-DC adapter board described in this application note has the following main
characteristics:
●
●
●
●
●
●
●
Circuit description
This circuit implements a flyback transformer which is a very popular topology for this kind of
application and power level, thanks to its simplicity and good trade-off between cost and
performance. To improve the converter's efficiency, the EVALSTSR30 demo board uses
synchronous rectification.
The converter works in both Continuous and Discontinuous conduction mode depending on
the input voltage (the circuit has a wide input voltage range) and the output load. The
68-kHz switching frequency provides a good compromise between the transformer size and
the harmonics of the switching frequency, optimizing input filter.
The input section includes protection elements (varistor, fuse and NTC for inrush current
limiting), a standard Pi-filter for EMC suppression, a bridge and an electrolytic bulk capacitor
as the front-end AC-DC converter. The transformer is a layer type, uses a standard ETD34
ferrite core and is designed to have a reflected voltage of 95V. The power MOS is a 700V -
1Ω and a transil clamp network is used for leakage inductance demagnetization.
On the primary side, the ST L6668 PWM controller integrates all the functions needed in a
SMPS (switch mode power supply) and enables building a complete system with a low
amount of external components. It includes a high voltage start-up generator, an
overvoltage protection input, frequency foldback for better efficiency at light loads,
programmable burst mode operation and soft start circuit.
Input:
–
–
Output:
–
No - Load:
–
Short circuit: protected with Auto-Restart feature
PCB type and size:
–
–
–
Safety: according to EN60065
EMI: Compliance with EN55022 - Class B specifications
V
f: 45 ~ 66 Hz
12V
Pin below 0.3W
FR4
Single side: 70 µm
120 x 75 mm
IN
: 88 ~ 264 V
DC
± 2% - 5A
RMS
AN2432