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AM460 数据表(PDF) 8 Page - Analog Microelectronics |
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AM460 数据表(HTML) 8 Page - Analog Microelectronics |
8 / 18 page Industrial Converter and Protector IC AM460 analog microelectronics April 2003 8/18 reduce power dissipation the transistor is an external component and protected against reverse polarity by an additional diode D1. Via pin SET an offset current ISET can be set at output IOUT (with the help of the inter- nal voltage reference and an external voltage divider as shown in Figure 2, for example). External resistor R0 permits the output current to be finely adjusted with parallel operation of current and the voltage output. For the output current provided by T1 the following ratio applies: SET INDAI OUT I R V I + = 0 8 with 0 2R V I SET SET = (3) with VINDAI the voltage at INDAI and VSET the voltage at pin SET (V/I converter inputs, Figure 2) 2. 4. The AM460 reference voltage source enables voltage to be supplied to external components (such as sen- sors, microprocessors, etc.). The reference voltage value VREF can be set via pin 13 VSET. If pin VSET is not connected, VREF = 5V; if VSET is switched to ground, VREF = 10V. Values between these can be set if two external resistors are used (inserted between pin VREF and pin VSET and between pin VSET and GND). External (ceramic) capacitor C1 at pin VREF stabilises the reference voltage. It must be connected even if the voltage reference is not in use. 5. The additional operational amplifier stage OP2 can be used as a current or voltage source to supply external components. OP2's positive input is connected internally to voltage VBG so that the output current or output voltage can be set across a wide range using one or two external resistors. OPERATING AM460 General information on 2- and 3-wire applications and the use of the current output In 3-wire operation (cf. Figure 3 right and Figure 7) the ground of the IC (pin GND) is connected up to the ex- ternal mass of the system Ground. The system's supply voltage VS is connected to pin VCC and pin VCC to pin RS+. In 2-wire operation (cf. Figure 3 left and Figure 7) system supply voltage VS is connected to pin RS+ and pin VCC to RS-. The ground of the IC (pin GND) is connected to the node between resistor R5 and load resistor RL (current output IOUT). IC ground (GND) is not the same as system ground (Ground)!! The output signal is picked up via load resistor RL which connects current output IOUT to the system ground. 2 The construction of the V/I converter is such that output current I OUT is largely independent of the current amplification βF of external transistor T1. Production-specific variations in the current amplification of the transistors used are compensated for internally by the V/I converter. R L V S 2-wire system signal source and conditioning IC GND Ground ≠ V CC ≠ VS Ground R L 3-wire system signal source and conditioning IC GND Ground = V CC = VS Ground GND = GND V CC I OUT I OUT VV CC S = Figure 3: Difference between 2- and 3-wire operation |
类似零件编号 - AM460 |
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类似说明 - AM460 |
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