EPR-84 overview
EPR-84 is a component documented by Power Integrations, Inc. The PDF description identifies it as "Engineering Prototype Report for EP-84 - <30 mW No-Load Consumption AC-DC Power Supply Using TNY264P." This guide condenses the most useful engineering information from the available PDF so that designers and sourcing teams can identify the checks that still need confirmation in the original document.
Datasheet snapshot
- Manufacturer: Power Integrations, Inc...
- Part number: EPR-84
- Category: IC
- Datasheet length: 28 Pages
Specifications and operating details
The following points were extracted from the PDF text. Check the associated conditions, notes and limits in the complete document before using a value in a design.
- The key performance characteristic of this circuit is its extremely low no-load power consumption of 30 mW.
- D5 and VR1 clamp the amplitude of the voltage spike that the transformer leakage inductance generates at switch turn-off, to keep it beneath the device’s maximum DRAIN- to-SOURCE voltage rating (700 V).
- Resistor R1 damps the high frequency oscillation caused by leakage inductance, which improves the conducted EMI performance of the circuit.
- The reflected output voltage V OR, which is determined by the transformer turns ratio (13:1), has been kept low (89 V) to minimize the power dissipation in the clamp circuit.
- The winding has just enough turns so that it will provide 550 µA to 600 µA (through R2) into the BYPASS (BP) pin at no-load (which fully disables the internal current source).
- C4 is the standard BP pin decoupling capacitor, which should always be a 50 V, 0.1 µF ceramic capacitor, located close to the IC.
- Resistor R6 and C3 dampen out the high frequency interaction between D7, T1 and U1 to reduce conducted EMI noise generation.
Engineering review checklist
- Verify capacitance tolerance, rated voltage, temperature range and any DC-bias derating.
- Check ESR, ripple-current capability, lifetime and polarity requirements under worst-case conditions.
- Confirm package dimensions, land pattern and reflow or mounting limits for the selected ordering code.
Always confirm values against the latest manufacturer-controlled datasheet, especially when qualifying a substitute or releasing a production BOM.
View the complete PDF and model record
Open the EPR-84 datasheet and model details to review the complete PDF, document pages and available product information.
Source attribution
Adapted from the PDF associated with this DigiCamel model page.
Source model URL: https://www.digicamel.com/product.php?slug=epr-84-power-integrations-inc