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TEA1703TS Datasheet(PDF) 3 Page - NXP Semiconductors |
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TEA1703TS Datasheet(HTML) 3 Page - NXP Semiconductors |
3 / 15 page TEA1703TS All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 1 — 7 June 2012 3 of 15 NXP Semiconductors TEA1703TS GreenChip SMPS standby control IC 7. Functional description 7.1 General control The TEA1703TS contains a standby controller for switched-mode power supplies. Typical configurations are shown in Figure 3 and Figure 4. Typically the TEA1703TS senses the output voltage and output power of a switched-mode power supply. The output voltage is sensed using a resistive divider network connected to the VSENSE pin. The output power is sensed by determining the switching frequency of the converter using an external filtering network. The converter output power is dependent on the switching frequency, such as in a discontinuous conduction mode flyback converter which has a fixed primary peak current during low load operation. The TEA1703TS can be used in combination with a TEA1753 flyback controller. The TEA1753T VINSENSE pin can be used to enter Standby mode. However, the VINSENSE pin is also used to reset a latched protection in the TEA1753T. The TEA1703TS has an integrated switching detection circuit which prevents unintentional resetting of a latched protection. When the TEA1753T is not switching, the TEA1703TS does not activate Standby mode. Switching is detected using the SWDET pin as shown in Figure 3. When configured with the TEA1733, switching detection is only required if the primary-side VCC (TEA1733 VCC pin) is discharged below the latched protection reset level. In Figure 4 a Zener diode Z1 is connected in series with the NPN transistor Q1 which discharges VCC on the VCC pin. The Zener diode is chosen to keep VCC on the VCC pin just below the TEA1733 VCC start-up level while the application is in Standby mode, guaranteeing a short restart time. If the Zener diode is omitted, connect the switching detection input as shown in Figure 4. Otherwise connect the SWDET pin using a series resistor to a fixed voltage. The TEA1703TS has an open-drain optocoupler driver output with an integrated freewheeling diode to the VCC pin. The optocoupler is efficiently driven in pulse mode which ensures that the optocoupler Current Transfer Ratio (CTR) remains high; see Section 7.7 and Section 7.8. |
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