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TEA1532 数据表(PDF) 6 Page - NXP Semiconductors |
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TEA1532 数据表(HTML) 6 Page - NXP Semiconductors |
6 / 27 page 9397 750 13113 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Preliminary data sheet Rev. 01 — 28 May 2004 6 of 27 Philips Semiconductors TEA1532 GreenChip ™II SMPS control IC In fixed frequency continuous conduction mode, the internal oscillator determines the start of the next converter stroke. In both operating modes, a cycle skipping mode is activated at very low power (standby) levels. 7.1 Start-up, mains enabling operation level and undervoltage lock out Refer to Figure 10 and Figure 11. Initially, the IC is self supplying from the rectified mains voltage via pin DRAIN. 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 Vm (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 will activate the power converter as soon as the voltage on pin VCC passes the Vstart level. The IC supply is taken over by the auxiliary winding as soon as the output voltage reaches its intended level and the IC supply from the mains voltage is subsequently stopped for high efficiency operation (green function). The moment the voltage on pin VCC drops below VUVLO (undervoltage lock out), the IC stops switching and enters a safe restart from the rectified mains voltage. Inhibiting the auxiliary supply by external means causes the converter to operate in a stable, well-defined burst mode. 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 on-time is controlled by the internally inverted pin CTRL voltage, which is compared with the primary current information. The primary current is sensed across an external resistor. The driver output is latched in the logic, preventing multiple switch-on. The internal control voltage is inversely proportional to the external pin CTRL voltage, 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 an internal control voltage range from 0.5 V to 0 V (a high external control voltage results in a low duty cycle). Fig 6. The Vsense(max) voltage as a function of VCTRL. VCTRL 1 V (typ) 0.52 V 1.5 V (typ) coa016 Vsense(max) Cycle skip active 25 mV |
类似零件编号 - TEA1532 |
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类似说明 - TEA1532 |
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