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TEA1210 Datasheet(PDF) 6 Page - NXP Semiconductors |
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TEA1210 Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 20 page  1999 Mar 08 6 Philips Semiconductors Preliminary specification High efficiency, high current DC/DC converter TEA1210TS In the PFM mode, regulation information from earlier PWM operating modes is used. This results in optimum inductor peak current levels in the PFM mode, which are slightly larger than the inductor ripple current in the PWM mode. As a result, the transition between PFM and PWM mode is optimum under all circumstances. In the PFM mode, TEA1210TS regulates the output voltage to the high window limit shown in Fig.3. Synchronous rectification For optimum efficiency over the whole load range, synchronous rectifiers inside the TEA1210TS ensure that during the whole second switching phase, all inductor current will flow through the low-ohmic power MOSFETs. Special circuitry is included which detects that the inductor current reaches zero. Following this detection, the digital controller switches off the power MOSFET and proceeds regulation. PWM-only mode When pin PWM is pulled to HIGH-level in the upconversion mode, the TEA1210TS will use PWM regulation independent of the load applied. As a result, the switching frequency does not vary over the whole load range. Furthermore, the P-type power MOSFET is always on when the input voltage exceeds the target output voltage. The internal synchronous rectifier still takes care that the inductor current does not fall below zero. In this way, the achieved efficiency is higher than in standard PWM-controlled converters. Start-up Start-up from low input voltage in boost mode is realized by an independent start-up oscillator, which starts switching the N-type power MOSFET as soon as the voltage on pins UPOUT is measured to be sufficiently high. The switch actions of the start-up oscillator will increase the output voltage. As soon as the output voltage is high enough for normal regulation, the digital control system takes over the control of the power MOSFETs. Undervoltage lockout As a result of too high load or disconnection of the input power source, the output voltage can drop so low that normal regulation cannot be guaranteed. In that case, the device switches back to start-up mode. If the output voltage drops down even further, switching is stopped completely. Shut-down When the shut-down input is made HIGH, the converter disables both switches and power consumption is reduced to a few microamperes. Fig.3 Response to load increase. handbook, full pagewidth MGK925 start corrective action load increase high window limit low window limit Vo IL time time |
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Similar Description - TEA1210 |
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