STEVAL-ISA007V1 STMicroelectronics, STEVAL-ISA007V1 Datasheet - Page 2

• Manufacturer Part Number: STEVAL-ISA007V1
• Description: EVAL BOARD 3PH PWR SUPPLY W/ESBT
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA007V1

• Mfg Application Notes: L5991 AppNote
• Design Resources: STEVAL-ISA007V1 Gerber Files STEVAL-ISA007V1 Schematic STEVAL-ISA007V1 Bill of Materials
• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 2, Isolated
• Power - Output: 150W
• Voltage - Output: 24V, 5V
• Current - Output: 6.25A, 75mA
• Voltage - Input: 250 ~ 850V
• Regulator Topology: Flyback
• Frequency - Switching: 90kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L5991, STC08DE150
• Input Voltage: 400 V
• Output Voltage: 5 V, 24 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: L5991, STC08DE150HV
• Other names: 497-5083

Reference design general description
1
2/5
Reference design general description
A dedicated reference design with ESBT has been developed, featuring the high power wide
input range requirement of a highly demanding industrial market.
The maximum output power is 150W. Generally speaking, the necessity to handle both high
output power and wide input voltage leads to the design of a fly-back stage working in mixed
operation mode: continuous and discontinuous:
The continuous current mode introduces a right half plan zero in the loop-transfer function
which makes the feedback stabilization difficult. At the input voltage range, and after a brief
description of the differences between continuous and discontinuous mode, it will soon be
clear that it is very difficult and inconvenient to design a fly-back converter working in
discontinuous mode. Finally, referring to the power spec of our demo, it is clear that
discontinuous mode cannot be used because it would determine a very high primary and
secondary peak current with a higher cost of all the main components involved: power
transistor, secondary diode and output capacitor.
Thanks to the adoption of the PWM L5991, the converter is able to operate in mixed mode.
For higher power levels with a switching frequency close to 90kHz, the converter operates in
Continuous Current Mode (CCM), while in stand-by and for power levels lower than 25W,
the converter works in Discontinuous Current Mode (DCM) at a switching frequency of
about 35kHz.
STEVAL-ISA007V1