STEVAL-ISA035V1 STMicroelectronics, STEVAL-ISA035V1 Datasheet - Page 12

• Manufacturer Part Number: STEVAL-ISA035V1
• Description: BOARD EVAL BASED ON VIPER22A
• Manufacturer: STMicroelectronics
• Series: VIPER™r
• Type: Other Power Managementr

Specifications of STEVAL-ISA035V1

• Mfg Application Notes: VIPer12/22A-E AppNote
• Main Purpose: AC/DC, Non-Isolated
• Outputs And Type: 1, Non-Isolated
• Power - Output: 4.2W
• Voltage - Output: 12V
• Current - Output: 350mA
• Voltage - Input: 85 ~ 264VAC
• Regulator Topology: Buck
• Frequency - Switching: 60kHz
• Board Type: Fully Populated
• Utilized Ic / Part: VIPer22A
• Input Voltage: 85 V to 264 V
• Output Voltage: 12 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: VIPER22A-E
• Other names: 497-8215

Circuit operation
1.8
12/17
Figure 10. Burst mode
Short circuit
The VIPer has pulse-by-pulse current limit. When the current ramps up to the current limit,
the pulse is terminated. This is manifested by reducing the output voltage as the current is
increased. The voltage decreases until it falls below the undervoltage shutdown threshold of
9 V, (pin4). During a short circuit the VIPer turns on and off. When the V
starting voltage, the current is limited by the pulse-by-pulse current limit. The voltage falls to
the undervoltage shutdown point and the cycle repeats itself at a 16% duty cycle. This
reduces the RMS current going through the circuit as seen in
Figure 11. Operation during a short
Figure
11.
dd
reaches the
AN2544