поискавой системы для электроныых деталей |
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UC2909 датащи(PDF) 5 Page - Texas Instruments |
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UC2909 датащи(HTML) 5 Page - Texas Instruments |
5 / 14 page 5 UC2909 UC3909 GND: The reference point for the internal reference, all thresholds, and the return for the remainder of the de- vice. The output sink transistor is wired directly to this pin. OVCTAP: The overcharge current taper pin detects when the output current has tapered to the float thresh- old in the overcharge state. OSC: The oscillator ramp pin which has a capacitor (CT) to ground. The ramp oscillates between approximately 1.0V to 3.0V and the frequency is approximated by: frequency CR TSET = •• 1 12 . OUT: The output of the PWM driver which consists of an open collector output transistor with 100mA sink capabil- ity. R10: Input used to establish a differential voltage corre- sponding to the temperature of the thermistor. Connect a 10k resistor to ground from this point. RSET: A resistor to ground programs the oscillator charge current and the trickle control current for the oscil- lator ramp. The oscillator charge current is approximately 175 . R SET . The trickle control current (ITRCK_CONTROL) is approxi- mately 0115 . R SET . RTHM: A 10k thermistor is connected to ground and is thermally connected to the battery. The resistance will vary exponentially over temperature and its change is used to vary the internal 2.3V reference by –3.9mV/°C. The recommended thermistor for this function is part number L1005-5744-103-D1, Keystone Carbon Com- pany, St. Marys, PA. STAT0: This open collector pin is the first decode bit used to decode the charge states. STAT1: This open collector pin is the second decode bit used to decode the charge states. STATLV: This bit is high when the charger is in the float state. VA–: The inverting input to the voltage error amplifier. VAO: The output of the voltage error amplifier. The up- per output clamp voltage of this amplifier is 5V. VCC: The input voltage to the chip. The chip is opera- tional between 7.5V and 40V and should be bypassed with a 1 µF capacitor. A typical ICC vs. temperature is shown in Figure 1. VLOGIC: The precision reference voltage. It should be bypassed with a 0.1 µF capacitor. Charge State Decode Chart STAT0 and STAT1 are open collector outputs. The out- put is approximately 0.2V for a logic 0. STAT1 STAT0 Trickle Charge 0 0 Bulk Charge 0 1 Over Charge 1 0 Float Charge 1 1 PIN DESCRIPTIONS (cont.) Figure 1. ICC vs. temperature. |
Аналогичный номер детали - UC2909_13 |
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Аналогичное описание - UC2909_13 |
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