Electronic Components Datasheet Search |
|
LNK501G Datasheet(PDF) 4 Page - Power Integrations, Inc. |
|
LNK501G Datasheet(HTML) 4 Page - Power Integrations, Inc. |
4 / 20 page 4 F 9/02 LNK501 The characteristics described above provide an approximate CV/CC power supply output without the need for secondary side voltage or current feedback. The output voltage regulation is influenced by how well the voltage across C2 tracks the reflected output voltage. This tracking is influenced by the value of the transformer leakage inductance which introduces an error. Resistor R2 and capacitor C2 partially filter the leakage inductance voltage spike reducing this error. This circuitry, used with standard transformer construction techniques provides much better output load regulation than a linear transformer, making this an ideal power supply solution in many low power applications. If tighter load regulation is required, an optocoupler configuration can be used while still employing the constant output current characteristics provided by LinkSwitch. Optional Secondary Feedback Figure 6 shows a typical power supply outline schematic using LinkSwitch with optocoupler feedback to improve output voltage regulation. On the primary side, the schematic differs from Figure 5 by the addition of R3, C3 and optocoupler U1. R3 forms a potential divider with R1 to limit the U1 collector emitter voltage. On the secondary side, the addition of voltage sense circuit components R4, VR1 and U1 LED provide the voltage feedback signal. In the example shown, a simple Zener (VR1) reference is used though more accurate references may be employed for improved output voltage tolerancing and cable drop compensation, if required. R4 provides biasing for VR1. The regulated output voltage is equal to the sum of the VR1 Zener voltage plus the forward voltage drop of the U1 LED. R5 is an optional low value resistor to limit U1 LED peak current due to output ripple. Manufacturer’s specifications for U1 current and VR1 slope resistance should be consulted to determine whether R5 is required. U1 is arranged with collector connected to primary ground and emitter to the anode of D1. This connection keeps the opto in an electrically “quiet” position in the circuit. If the opto was Output Voltage Tolerance envelope without optocoupler Inherent CC to CV transition point Load variation during battery charging Voltage feedback threshold Characteristic with optocoupler Typical inherent characteristic without optocoupler PI-2788-092101 Output Current Figure 6. Power Supply Outline Schematic with Optocoupler Feedback. Figure 7. Influence of the Optocoupler on the Power Supply Output Characteristic. LNK501 LinkSwitch 85-265 VAC VOUT RTN S D C C1 C3 C2 U1 R4 R5 VR1 R1 R2 D1 R3 PI-2787-092002 U1 |
Similar Part No. - LNK501G |
|
Similar Description - LNK501G |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |