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LTM2882CV-3PBF Datasheet(PDF) 11 Page - Linear Technology |
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LTM2882CV-3PBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LTM2882 11 2882p Figure 5. VCC and VL Are Independent 2882 F05 ON DIN T1IN R1OUT T2IN R2OUT DE DOUT T1OUT R1IN T2OUT R2IN LTM2882 ANY VOLTAGE FROM 1.62V TO 5.5V 3.0V TO 3.6V LTM2882-3 4.5V TO 5.5V LTM2882-5 EXTERNAL DEVICE VL VCC VCC2 GND GND2 APPLICATIONS INFORMATION Overview The LTM2882 μModule transceiver provides a galvani- cally-isolated robust RS232 interface, powered by an integrated, regulated DC/DC converter, complete with decoupling capacitors. The LTM2882 is ideal for use in networks where grounds can take on different voltages. Isolation in the LTM2882 blocks high voltage differences, eliminates ground loops and is extremely tolerant of com- mon mode transients between grounds. Error-free opera- tion is maintained through common mode events greater than 30kV/μs providing excellent noise isolation. μModule Technology The LTM2882 utilizes isolator μModule technology to translate signals and power across an isolation barrier. Signals on either side of the barrier are encoded into pulses and translated across the isolation boundary using coreless transformers formed in the μModule substrate. This system, complete with data refresh, error checking, safe shutdown on fail, and extremely high common mode immunity, provides a robust solution for bidirectional signal isolation. The μModule technology provides the means to combine the isolated signaling with our advanced dual RS232 transceiver and powerful isolated DC/DC converter in one small package. DC/DC Converter The LTM2882 contains a fully integrated isolated DC/DC converter, including the transformer, so that no external components are necessary. The logic side contains a full- bridge driver, running at about 2MHz, and is AC-coupled to a single transformer primary. A series DC blocking capacitor prevents transformer saturation due to driver duty cycle imbalance. The transformer scales the primary voltage, and is rectified by a full-wave voltage doubler. This topology eliminates transformer saturation caused by secondary imbalances. TheDC/DCconverterisconnectedtoalowdropoutregulator (LDO) to provide a regulated low noise 5V output, VCC2. An integrated boost converter generates a 7V VDD supply and a charge pumped –6.3V VEE supply.VDD andVEE power the output stage of the RS232 drivers and are regulated to levels that guarantee greater than ±5V output swing. The internal power solution is sufficient to support the transceiver interface at its maximum specified load and data rate, and has the capacity to provide additional 5V power on the isolated side VCC2 and GND2 pins. VCC and VCC2 are each bypassed internally with 2.2μF ceramic capacitors. VL Logic Supply A separate logic supply pin VL allows the LTM2882 to inter- face with any logic signal from 1.62V to 5.5V as shown in Figure 5. Simply connect the desired logic supply to VL. There is no interdependency between VCC and VL; they may simultaneously operate at any voltage within their specified operating ranges and sequence in any order. VL is bypassed internally by a 2.2μF capacitor. Hot Plugging Safely Caution must be exercised in applications where power is plugged into the LTM2882’s power supplies, VCC or VL, due to the integrated ceramic decoupling capacitors. The parasitic cable inductance along with the high Q char- acteristics of ceramic capacitors can cause substantial ringing which could exceed the maximum voltage ratings and damage the LTM2882. Refer to Linear Technology Ap- plication Note 88, entitled “Ceramic Input Capacitors Can Cause Overvoltage Transients” for a detailed discussion and mitigation of this phenomenon. |
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