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UM0584 Datasheet(PDF) 3 Page - STMicroelectronics

Part # UM0584
Description  STEVAL-ISA031V1: 40 W SMPS with HV MOSFET and L6565 for three-phase industrial applications
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0584 Datasheet(HTML) 3 Page - STMicroelectronics

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UM0584
Demonstration board description
Doc ID 14974 Rev 1
3/9
1
Demonstration board description
The STEVAL-ISA031V1 demonstration board is based on a quasi resonant flyback
converter and employs the STW4N150 power MOSFET as the primary switch. The
STW4N150 is a 5
Ω 1500 V power MOSFET designed with STMicroelectronics’ proprietary
high voltage "Mesh Overlay" technology, which gives the switch very low RDS(on) per area,
low gate charge and high switching performance. The STW4N150 device is available in the
TO-220, TO-247 and TO-220FH packages.
The main specifications of the demonstration board are provided in table below.
The input section features two connectors: CON1 for 400 Vac input voltage and CON2 for
230 Vac input voltage.
The output voltages are available on CON3, with a shared ground between the two outputs.
The converter is controlled by the L6565, a primary controller for quasi resonant ZVS (zero
voltage switching) flyback converters. The IC controls the power capability variations with
the mains voltage by means of line voltage feed-forward. In addition to the very low startup
and quiescent currents, the device manages light load conditions with optimized
consumption thanks to a special function which automatically lowers the operating
frequency while maintaining operation as close to ZVS as possible. The IC also includes a
disable function, an on-chip filter on current sense, an error amplifier with a precise
reference voltage for primary regulation and effective two-level overcurrent protection.
The transformer reflected voltage is set to 400 V, providing sufficient 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
diode D7. A spike killer circuit for auxiliary voltage fluctuations is provided but not connected
(Q11, C13, R13). The primary current is measured using external sensing resistors (R20,
R21) for current mode operation.
Output voltage regulation is performed via a secondary feedback on the 24 V output. The
feedback network consists of a programmable voltage reference, TL431, driving an
optocoupler which ensures the required insulation between the primary and secondary
sections. The optotransistor drives the feedback pin (COMP) which controls the operation of
the IC.
Table 1.
STEVAL-ISA031V1 main specifications
Parameter
Value
Input voltage range
185 to 460 Vac
Input frequency range
50/60 Hz
Output 1
24 V @ 1.7 A
Output 2
5 V @ 1 A
Output power
40 W
Safety
EN60950
EMI
EN55014


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