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TEA1103T データシート(PDF) 11 Page - NXP Semiconductors |
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TEA1103T データシート(HTML) 11 Page - NXP Semiconductors |
11 / 28 page 1999 Jan 27 11 Philips Semiconductors Preliminary specification Fast charge ICs for NiCd and NiMH batteries TEA1103; TEA1103T; TEA1103TS At an increase of the battery voltage the 14-bit Analog-to-Digital Converter (ADC) is refreshed with this new value. Therefore, the digitized value always represents the maximum battery voltage. A decreased Vbat voltage is not stored, but is compared to the stored value. Full is detected when the voltage decrease of Vbat is 1⁄4% of the stored peak battery value. To avoid interference due to the resistance of the battery contacts during battery voltage sensing, the charge current is regulated to zero during t = 210 × POD × tosc, via the regulation pins AO and PWM. At the last period, the Vbat voltage is sensed and stored in a sample-and-hold circuit. This approach ensures very accurate detection of the battery full condition (minus 1 ⁄4%). When battery full is determined by ∆T/∆t, the voltage on the NTC pin is used as the input voltage to the AD/DA converter. The sampling time at ∆T/∆t sensing is given by the following equation: (9) After this initialized sample time the new temperature voltage is compared to the preceding AD/DA voltage and the AD/DA is refreshed with this new value. A certain increase of the temperature is detected as full battery, depending on the initialization settings. The decision of full detection by ∆T/∆t or Vpeak is digitally filtered thus avoiding false battery full detection. t sampling ∆T ∆t ------- 2 17 POD × PSD × t osc × = Output drivers The charge current regulation signal is available at two output pins, AO and PWM. ANALOG OUTPUT The analog control voltage output at pin 18 (AO) can be used to drive an opto-coupler in mains separated applications when an external resistor is connected between AO and the opto-coupler. The maximum current through the opto-coupler diode is 2 mA. The voltage gain of amplifier A2 is typical 11 dB (times 3.5). The DC voltage transfer is given by the following equation: VAO = 3.5 × (VLS − 1.35). The AO output can be used for: • Linear (DC) applications • Not mains isolated SMPS with a separate controller • Mains isolated SMPS, controlled by an opto-coupler. PULSE WIDTH MODULATOR (PWM) The LS voltage is compared internally with the oscillator voltage to deliver a pulse width modulated output at PWM (pin 15) to drive an output switching device in a SMPS converter application via a driver stage. The PWM output is latched to prevent multi-pulsing. The maximum duty factor is internally fixed to 79% (typ.). The PWM output can be used for synchronization and duty factor control of a primary SMPS via a pulse transformer. |
同様の部品番号 - TEA1103T |
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同様の説明 - TEA1103T |
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