RDK-249 Power Integrations, RDK-249 Datasheet - Page 39

• Manufacturer Part Number: RDK-249
• Description: KIT REF DESIGN PFS762HG
• Manufacturer: Power Integrations
• Series: HiperTFS®r

Specifications of RDK-249

• Main Purpose: Reference Design, PC Power Supply
• Embedded: No
• Utilized Ic / Part: TFS762HG
• Primary Attributes: 12V 25A, 5V 2.9A Outputs, 300 ~ 385 VDC Input
• Output Voltage: 5 V
• Input / Supply Voltage (max): 385 VDC
• Input / Supply Voltage (min): 300 VDC
• Duty Cycle (max): 50 %
• Mounting Style: Through Hole
• Output Current: 2.9 A
• Output Power: 14.5 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Other names: 596-1398

Figure 32 – Standby OV Protection.
13.6 Main or Standby OV Shutdown
In order to activate the Standby or Main Overvoltage Protection Circuit for testing
purpose, the recommended procedure is to temporarily short-circuit the input side of the
respective optocouplers: U1A for the Main section or U2A for the Standby section.
Without proper signal, the feedback loop will be forced to maximize the control signal and
the Main or the Standby output voltage will increase all the way up to the shut-down limit.
This overvoltage trigger condition will force the current into the BP pin to exceed the
threshold limit and the internal HiperTFS controller to lock-out in a disabled state. For
resetting the lock-out condition, the input voltage must be removed to allow the voltage
on the BP pin to be discharged.
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Upper (red): V
Upper (yellow): V
Lower: Standby I
STBY
DRAIN
MAIN
, 1 V / div.
, 2 V / div.
, 200 mA, 2 ms / div.
Figure 33 – Main OV Protection.
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Upper (red): V
Upper (yellow): V
Lower: Main I
Power Integrations
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DRAIN
STBY
MAIN
, 1 V / div.
, 750 mA, 2 ms / div.
, 2 V / div.