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SEN013DG-TL Datasheet(PDF) 3 Page - Power Integrations, Inc. |
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SEN013DG-TL Datasheet(HTML) 3 Page - Power Integrations, Inc. |
3 / 8 page Rev. B 11/05/10 3 SEN012-013 www.powerint.com Applications Considerations The maximum voltage that the device can sustain across the VCC and G pin is 16 V. The maximum voltage that any of the source channels can be at with respect to the ground terminal is 6.5 V. SENZero has a typical on state resistance of approxi- mately 500 W at room temperature. The device is therefore typically used in series with high ohmic value resistors where this on resistance is a small percentage of the total series impedance. It is not necessary to provide a local bypass capacitor on the VCC pin. Operating Configurations for the SENZero One configuration to power up the SENZero is shown in Figure 7. In this circuit, SENZero is powered up from an unregulated bias winding through a simple series pass regulator formed by Q1, R B and VZ. This configuration ensures the VCC voltage is limited even if the maximum bias voltage exceeds 16 V. During power down, as soon as the bias voltage falls below V Z, SENZero will turn off. The series pass transistor Q1 is necessary only if the bias winding voltage regulation is not tight enough (unregulated). If the voltage on the bias winding is regulated or is such that the voltage on the VCC pin can be maintained in the range 6 V < VCC < 16 V, then the series pass transistor (Q1, R B and VZ) can be eliminated. Figure 7. SENZero Powered from an Unregulated Bias Winding Through a Series Pass Regulator. Device is Enabled When Bias Voltage is Present. PI-6052-072010 Unregulated Bias Q1 (2N3904) VZ SENZero VCC G D1 D2 S1 S2 RB (2 k Ω) PI-6051-072010 ON/OFF Disable Regulated Auxiliary Q1 (2N3906) RB (2 k Ω) SENZero VCC G RA (20 k Ω) D1 D2 S1 S2 PI-6053-110510 Unregulated Bias Q1 (2N3904) VZ SENZero VCC G D1 D2 S1 S2 RB (2 k Ω) RB (100 k Ω) ON/OFF Enable Q2 (2N3906) A configuration that can be used to trigger remote-off functionality is shown in Figure 8. In this configuration, a regulated auxiliary output is used to power the IC. Transistor Q1 serves as the ON/OFF switch which is commanded by the Enable/Disable signal at its base. Figure 8. SENZero Powered From a Regulated Auxiliary Winding. An alternative remote-off configuration is shown in Figure 9 where an unregulated bias voltage supplies the SENZero through a series pass regulator similar to the one shown in Figure 7. However the circuit of Figure 9 includes an ON/OFF transistor Q2. In other versions of this circuit Q2 can be replaced by an optocoupler allowing the ON/OFF disable signal to be communicated from a secondary of the power supply such as in PC power supplies. Figure 9. A Modified Version of an Unregulated Bias Winding Supplying Power Through a Series Pass Regulator. Transistor Q2 Provides Remote-Off Functionality. |
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