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TEA1104T 数据表(PDF) 4 Page - NXP Semiconductors |
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TEA1104T 数据表(HTML) 4 Page - NXP Semiconductors |
4 / 16 page 1996 Feb 26 4 Philips Semiconductors Objective specification Cost effective battery monitor and fast charge IC for NiCd and NiMH chargers TEA1104; TEA1104T PINNING SYMBOL PIN DESCRIPTION GND 1 ground NTC 2 negative temperature coefficient resistor input VS 3 stabilized supply voltage Vbat 4 battery voltage sensing Rref 5 reference resistor VP 6 positive supply voltage OSC 7 oscillator input LED 8 LED output Fig.2 Pin configuration. handbook, halfpage 1 2 3 4 8 7 6 5 MGE353 TEA1104 LED OSC NTC VP Rref Vbat Vs GND INTRODUCTION The operation of the TEA1104; TEA1104T is explained with the aid of the application diagram illustrated in Fig.7. An application note (AN95085) is available describing the versatility of the TEA1104; TEA1104T. An external power current source charges the batteries via an electronic switch which is controlled by the TEA1104. The TEA1104 monitors the battery voltage. Fully charged batteries are detected when the battery voltage peaks. In fact, a voltage drop of 0.25% with respect to the top value is detected. Fast charging is initiated at ‘power on’ or at ‘replaced batteries’. The switch is continuously on, providing that all protection levels are met. At battery full detection, the charge current is duty cycled to reduce the average charge current to a lower level, keeping the batteries fully charged but at he same time assuring long battery life. In Fig.3 the battery voltage during fast charge is plotted. FUNCTIONAL DESCRIPTION A block diagram of the TEA1104; TEA1104T is illustrated in Fig.1 Mode latch The Mode latch determines if the system is in the fast or in the slow charge mode. • Fast charge is active at: – power switch-on and battery connected – temperature between minimum and maximum value – battery insert • Trickle charge is active if: – battery full is detected – maximum time is exceeded – maximum cut-off temperature is exceeded after the initial phase. Supply block For correct start-up, the IC supply current is limited to 35 µA (typ.) until the start-up voltage of 6.4 V is reached (standby mode). Thereafter, the operating supply voltage VP has to be within the window of 5.45 to 11.5 V, meaning that there is no need for an external voltage regulator to supply the IC. The supply block delivers the following outputs: • With the help of an external resistor (pin Rref), a reference current is obtained which defines the accuracy of all IC timing characteristics • Externally available 4.25 V stabilized voltage source (Vsource). This source is used internally to supply a large part of the circuit and can be used to set the NTC biasing and to supply other external circuitry with a maximum current of 1 mA. Protection information is provided via VS, to design a dual LED indicator • Power-on reset pulse resets all digital circuitry after a start or restart, due to an interrupted VS. |
类似零件编号 - TEA1104T |
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类似说明 - TEA1104T |
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