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TEA1204 Datasheet(PDF) 6 Page - NXP Semiconductors |
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TEA1204 Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 20 page  1998 Mar 02 6 Philips Semiconductors Product specification High efficiency DC/DC converter TEA1204T Burst mode trigger input For burst-mode applications, in which the required output power periodically changes between two different power levels, the burst mode trigger feature gains optimal dynamic response. A digital signal indicating the load change must be connected to the burst pin. Polarity of the burst signal is arbitrary. When not used, the burst pin must be tied to pin 3 or pin 6. Shut-down When the shut-down pin is made HIGH, the converter disables both switches and power consumption is reduced to a few µA. Power switches The power switches in the IC are one N-type and one P-type MOSFET, having a typical pin-to-pin resistance of 0.12 Ω and 0.16 Ω respectively. The maximum average current in the switches is 1.0 A. Temperature protection At too high device temperature (typical 165 °C), the converter stops operating. It resumes operation when the device temperature falls below 165 °C again. As a result, low-frequent cycling between on and off state will occur. It should be noted that in the event of device temperatures around the cut-off limit, the application differs strongly from maximum specifications. Current limiters If the current in one of the power switches exceeds its limit, current ramping is stopped immediately, and the next switching phase is entered. Current limitation is required to enable optimal use of energy in Lithium-Ion batteries, and to keep power conversion efficient during temporary high loads. Furthermore, current limitation protects the IC against overload conditions, inductor saturation, etc. Behaviour at input voltage exceeding the specified range In general, an input voltage exceeding the specified range is not recommended since instability may occur. There are two exceptions: • Upconversion: at an input voltage equal to or higher than the target output voltage, but up to 6 V, the converter will stop switching and the external schottky diode will take over, resulting in Vo equalling Vi minus the diode voltage drop. • Downconversion: when the input voltage is equal to or lower than the target output voltage, but higher than 2.6 V, the P-type FET will stay conducting resulting in Vo being equal to Vi minus some resistive voltage drop. The current limit function remains active. Fig.3 Coil current waveforms in the various power modes. handbook, halfpage time low power mode medium power mode 1 medium power mode 2 low DC current high DC current increasing load MGK924 |
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