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ADM1041A Fiches technique(PDF) 14 Page - Analog Devices |
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ADM1041A Fiches technique(HTML) 14 Page - Analog Devices |
14 / 56 page ADM1041A Rev. 0 | Page 14 of 56 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ADM1041A TOP VIEW (Not to Scale) VDD 1 VLS/CS–/FS 2 CS+ 3 CCMP 4 VCMP 5 SHRO SHRS+ SCMP VS+ VS–/SHRS– 24 23 22 21 20 FD 6 GND 7 ICT 8 PULSE/ACSENSE1/MON1 9 FG AC_OK/OTP/MON5 DC_OK/MON4 PSON/MON3 19 18 17 16 ACSENSE2/MON2 10 CBD/ALERT 11 PEN 12 ADD0 SDA/PSONLINK SCL/AC_OKLink 15 14 13 Figure 7. Pin Configuration Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 VDD Positive Supply for the ADM1041A. Normal range is 4.5 V to 5.5 V. Absolute maximum rating is 6.5 V. 2 VLS/CS–/FS Inverting Differential Current Sense Input, Local Voltage Sense Pin, and OrFET Source. These three functions are served by a common divider. The local voltage sense input is used for local overvoltage and undervoltage sensing. This pin also provides an input to the false UV clamp that prevents shutdown during an external load overvoltage condition. When supporting an OrFET circuit, this pin represents the FET source and is the inverting input of a differential amplifier looking for the presence of a reverse voltage across the FET, which might indicate a failure mode. 3 CS+ Noninverting Differential Current Sense Input. The differential sensitivity of CS+ and CS– is normally around 10 mV to 40 mV at the input to the ADM1041A. Nulling any external divider offset is achieved by injecting a trimmable amount of current into either the inverting or noninverting input of the second stage of the current sense amplifier. A compensation circuit is used to ensure the amount of current for zero-offset tracks the common-mode voltage. Nulling of any amplifier offset is done in a similar manner except that it does not track the common-mode voltage. 4 CCMP Current Error Amplifier Compensation. This pin is the output of the current limit transconductance error amplifier. A series resistor and a capacitor to ground are required for loop compensation. 5 VCMP Voltage Error Amplifier Compensation. This is the output of a voltage error transconductance amplifier. Compensate with a series capacitor and resistor to ground. An external emitter-follower or buffer is typically used to drive an optocoupler. Output voltage positioning may be obtained by placing a second resistor directly to ground. Refer to Analog Devices applications notes on voltage positioning. 6 FD A divider from the OrFET drain is connected here. A differential amplifier is then used to detect the presence of a reverse voltage across the FET, which indicates a fault condition and causes the OrFET gate to be pulled low. 7 GND Ground. This pin is double bonded for extra reliability. If the ground pin goes positive with respect to the remote sense return (VS–) for a sustained period indicating that the negative remote sense line is disconnected, PEN is disabled. 8 ICT Input for Current Transformer. The sensitivity of this pin is suitable for the typical 0.5 V to 1 V signal that is normally available. If this function is enabled, the CS+ amplifier is disabled. This pin is also used for extended SMBus addressing, that is, pulled below ground to allow additional SMBus addresses. 9 PULSE/ACSENSE1/ MON1 Pulse Present, AC/Bulk Sense 1, or Monitor 1 Input. PULSE: This tells the OrFET circuit that the voltage from the power transformer is normal. A peak hold allows the OrFET circuit to pass through the pulse skipping that occurs with very light loads, but turns off the circuit about one second after the last pulse is recognized. ACSENSE1: This sense function also uses the peak voltage on this pin to measure the bulk capacitor voltage. If too low, AC_OK and DC_OK can warn of an imminent loss of power. Threshold level and hysteresis can be trimmed. When not selected, ACSENSE1 defaults to true. MON1: When MON1 is selected for this pin, its input is compared against a 1.25 V comparator that could be used for monitoring a postregulated output; includes overvoltage, undervoltage, and overtemperature conditions. |
Numéro de pièce similaire - ADM1041A_15 |
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Description similaire - ADM1041A_15 |
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