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TEA1200TS Datasheet(PDF) 8 Page - NXP Semiconductors |
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TEA1200TS Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 24 page  2002 May 14 8 Philips Semiconductors Product specification 0.95 V starting DC-to-DC converter with low battery indicator TEA1200TS Temperature protection When the DC-to-DC converter operates in the PWM mode, and the die temperature gets too high (typical value is 190 °C), the converter will stop operating. It resumes operation when the die temperature falls below 90 °C again. As a result, low frequency cycling between the on and off state will occur. It should be noted that in the event of device temperatures at the cut-off limit, the application differs strongly from maximum specifications. Current limiters If the current in one of the power switches exceeds the programmed limit in the PWM mode, the current ramp is stopped immediately and the next switching phase is entered. Current limiting is required to keep power conversion efficient during temporary high loads. Furthermore, current limiting protects the IC against overload conditions, inductor saturation, etc. The current limiting level is set by an external resistor which must be connected between pin ILIM and ground for downconversion, or between pins ILIM and UPOUT/DNIN for upconversion. External synchronization and PWM-only mode If an external high-frequency clock or a HIGH level is applied to pin SYNC/PWM, the TEA1200TS will use PWM regulation independent of the load applied. In the event that a high-frequency clock is applied, the switching frequency in the PWM mode will be exactly that frequency divided by 22. In the PWM mode the quiescent current of the device increases. In the event that no external synchronization or PWM mode selection is necessary, pin SYNC/PWM must be connected to ground. Behaviour when the input voltage exceeds the specified range In general, an input voltage exceeding the specified range is not recommended since instability may occur. There are two exceptions: 1. Upconversion: at an input voltage higher than the target output voltage, but up to 5.5 V, the converter will stop switching and the external Schottky diode will take over. The output voltage will equal the input voltage minus the diode voltage drop. Since all current flows through the external diode in this situation, the current limiting function is not active. In the PWM mode, the P-type power MOSFET is always on when the input voltage exceeds the target output voltage. The internal synchronous rectifier ensures that the inductor current does not fall below zero. As a result, the achieved efficiency is higher in this situation than standard PWM-controlled converters achieve. 2. Downconversion: when the input voltage is lower than the target output voltage, but higher than 2.2 V, the P-type power MOSFET will stay conducting resulting in the output voltage being equal to the input voltage minus some resistive voltage drop. The current limiting function remains active. Low battery detector The low battery detector is an autonomous circuit which can work at an input voltage down to 0.90 V. It is always on, even when all other blocks are in the shut-down mode. The low battery input (pin LBI1) is adjusted to accept a 1-cell NiCd or NiMH battery voltage directly. Hysteresis is included for proper operating. The output of the low battery detector (pin LBO) is an open-collector output. The output is high (i.e. no current is sunk by the collector) when the input voltage of the detector is below the lower detection level. |
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