STEVAL-ISA054V1 STMicroelectronics, STEVAL-ISA054V1 Datasheet - Page 5

• Manufacturer Part Number: STEVAL-ISA054V1
• Description: BOARD DEMO STW9N150 100W 3PHASE
• Manufacturer: STMicroelectronics
• Type: MOSFET & Power Driverr

Specifications of STEVAL-ISA054V1

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 2, Isolated
• Power - Output: 100W
• Voltage - Output: 24V, 3.3V or 5V
• Current - Output: 4A, 1A
• Voltage - Input: 180 ~ 265VAC & 320 ~ 480VAC
• Regulator Topology: Flyback
• Frequency - Switching: 250kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L5970, STW9N150, UC3844B
• Input Voltage: 180 V to 265 V, 400 V
• Output Voltage: 3.3 V, 5 V, 24 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: STW9N150
• Kit Application Type: Power Management
• Application Sub Type: Auxiliary Power Supply
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: STW9N150
• Other names: 497-8849

UM0674
1
Demonstration board description
The proposed board is based on a flyback converter and employs as primary switch the
STW9N150, a 2.5 Ω, 8 A, 1500 V power MOSFET, which uses STMicroelectronics
proprietary high voltage "mesh overlay" technology. Thanks to this technology, the switch
features very low R
device is available in a TO-247 package.
The demonstration board has been designed according to the specifications listed in table
below.
Table 1.
The input section is provided with two connectors: CON1 for 400 Vac input voltage, and
CON2 for 230 Vac input voltage. The output voltages are available on CON3 and CON4,
with a shared ground between the two outputs, as shown in
The converter is controlled by the UC3844B, a primary controller for the flyback converter.
The UC3844B controller provides the necessary features to implement off-line or DC-to-DC
fixed-frequency current mode control schemes with a minimal number of external parts. The
IC can control the power capability variations with the mains voltage by means of the feed-
forward line voltage. The IC also includes a disable function, an on-chip filter on the current
sense pin, an error amplifier with a precise reference voltage for primary regulation and an
effective two-level overcurrent protection.
The reflected voltage of the transformer has been set to 400 V, providing enough margin for
the leakage inductance voltage spike, and a small RCD clamper circuit is used to limit
excess voltage on the drain of the MOSFET.
During normal operation, the IC is powered by the auxiliary winding of the transformer via
the D2 diode. The primary current is measured using the external sensing resistor (R23) for
current mode operation.
The output voltage regulation is performed by a secondary feedback on the 24 V output.
The feedback network consists of a programmable voltage reference (TL1431C), which
drives an optocoupler that ensures the required insulation between the primary and
secondary sections is met. The optotransistor drives the feedback pin (COMP) which
controls the operation of the IC.
Main specifications
Input voltage (CON1)
Input voltage (CON2)
Input frequency
Output power
Parameter
Output 1
Output 2
DS(on)
Safety
EMI
per area, low gate charge and high switching performances. The
Doc ID 15343 Rev 1
Demonstration board description
Figure
400 V
180-265 V
3.3 V at 1 A
24 V at 4 A
5 V at 1 A
EN60950
EN55014
100 W
Value
50 Hz
acrms
3.
acrms
±20%
5/23