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TEA1530AT Arkusz danych(PDF) 6 Page - NXP Semiconductors |
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TEA1530AT Arkusz danych(HTML) 6 Page - NXP Semiconductors |
6 / 21 page TEA1530T_AT_AP_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 30 June 2008 6 of 21 NXP Semiconductors TEA1530T/AT/AP GreenChip II SMPS control IC 7.1 Start-up, mains enabling operation level and undervoltage lockout Refer to Figure 8 and Figure 9. Initially, the IC is self supplying from the rectified mains voltage via pin DRAIN. The supply capacitor CVCC (at pin 1) is charged by the internal start-up current source to a level of about 4 V or higher, depending on the drain voltage. Once the drain voltage exceeds the Vmains(oper)(en) (mains-dependent operation-enabling level), the start-up current source will continue charging capacitor CVCC (switch S1 will be opened), see Figure 1. The IC activates the power converter as soon as the voltage on pin VCC passes the Vstartup level. At this moment the IC supply from the high voltage pin is stopped (green function). The IC supply is taken over by the auxiliary winding of the flyback converter. The moment the voltage on pin VCC drops below Vth(UVLO) (undervoltage lockout), the IC stops switching and performs a safe restart from the rectified mains voltage. In the safe restart mode the driver output is disabled and the voltage on pin VCC is recharged via the pin DRAIN. 7.2 Supply management All (internal) reference voltages are derived from a temperature compensated, on-chip band gap circuit. 7.3 Current control mode Current control mode is used for its good line regulation behavior. The primary current is sensed across an external resistor and compared with the internal control voltage. The driver output is latched in the logic, preventing multiple switch-on. The internal control voltage is inversely proportional to the voltage on the external pin CTRL with an offset of 1.5 V. This means that a voltage range from 1 V to approximately 1.5 V on pin CTRL will result in a pin SENSE voltage range from 0.52 V to 25 mV (a high external control voltage results in a low duty cycle). 7.4 Oscillator The fixed frequency of the oscillator is set by an internal current source and capacitor. Fig 5. The Vsense(max) voltage as a function of VCTRL VCTRL (V) 1 V (typ) 0.52 V 1.5 V (typ) coa016 Vsense(max) (V) cycle skip active 25 mV |
Podobny numer części - TEA1530AT |
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Podobny opis - TEA1530AT |
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