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UC2909MDWREP датащи(PDF) 7 Page - Texas Instruments |
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UC2909MDWREP датащи(HTML) 7 Page - Texas Instruments |
7 / 21 page frequency = 1 ¾ 1.2 · · C R T SET 1.75 ¾ R SET 0.115 ¾ R SET UC2909-EP www.ti.com SLUSA72 – JULY 2010 DEVICE INFORMATION TERMINAL FUNCTIONS TERMINAL DESCRIPTION NAME NO. CA- 13 The inverting input to the current error amplifier. The output of the current error amplifier which is internally clamped to approximately 4 V. It is internally CAO 14 connected to the inverting input of the PWM comparator. The inverting and non-inverting inputs to the current sense amplifier. This amplifier has a fixed gain of five CS-, CS+ 17, 16 and a common-mode voltage range of from –250 mV to VCC. CSO 15 The output of the current sense amplifier which is internally clamped to approximately 5.7 V. The input to a comparator that detects when battery voltage is low and places the charger in a trickle charge CHGENB 10 state. The charge enable comparator makes the output of the voltage error amplifier a high impedance while forcing a fixed 10 mA into CA- to set the trickle charge current. The reference point for the internal reference, all thresholds, and the return for the remainder of the device. GND 3 The output sink transistor is wired directly to this pin. The overcharge current taper pin detects when the output current has tapered to the float threshold in the OVCTAP 9 overcharge state. The oscillator ramp pin which has a capacitor (CT) to ground. The ramp oscillates between approximately 1 V to 3 V and the frequency is approximated by: OSC 19 (1) The output of the PWM driver which consists of an open collector output transistor with 100-mA sink OUT 5 capability. Input used to establish a differential voltage corresponding to the temperature of the thermistor. Connect a R10 20 10-K Ω resistor to ground from this point. A resistor to ground programs the oscillator charge current and the trickle control current for the oscillator ramp. The oscillator charge current is approximately: RSET 18 (2) The trickle control current (ITRCK_CONTROL) is approximately: (3) A 10-K Ω 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 2.3-V reference by -3.9 RTHM 1 mV/°C. The recommended thermistor for this function is part number L1005-5744-103-D1, Keystone Carbon Company, St. Marys, PA. STAT0 7 This open collector pin is the first decode bit used to decode the charge states. STAT1 6 This open collector pin is the second decode bit used to decode the charge states. STATLV 8 This bit is high when the charger is in the float state. VA- 12 The inverting input to the voltage error amplifier. VAO 11 The output of the voltage error amplifier. The upper output clamp voltage of this amplifier is 5 V. The input voltage to the chip. The chip is operational between 7.5 V and 40 V and should be bypassed with VCC 4 a 1-µF capacitor. A typical ICC vs. temperature is shown in Figure 1. VLOGIC 2 The precision reference voltage. It should be bypassed with a 0.1-µF capacitor. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): UC2909-EP |
Аналогичный номер детали - UC2909MDWREP |
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Аналогичное описание - UC2909MDWREP |
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