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L6712AQ датащи(PDF) 6 Page - STMicroelectronics |
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L6712AQ датащи(HTML) 6 Page - STMicroelectronics |
6 / 29 page L6712A L6712 6/29 10 9 DROOP A current proportional to the sum of the current sensed in both channel is sourced from this pin (50 µA at full load, 70µA at the Constant Current threshold). Short to FB to implement the Droop effect: the resistor connected between FB and VSEN (or the regulated output) allows programming the droop effect. Otherwise, connect to GND directly or through a resistor (43k Ω max) and filter with 1nF capacitor. In this last case, current information can be used for other purposes. 11 11 REF_IN / OUT Reference input/output. Filter vs. GND with 1nF ceramic capacitor (a total of 100nF capacitor is allowed). It reproduces the reference used for the regulation following VID code: when VID=111, the reference for the regulation must be connected on this pin. References ranging from 0.800V up to 3.300V can be accepted. 12 12 VSEN Connected to the output voltage it is able to manage Over & Under-voltage conditions and the PGOOD signal. It is internally connected with the output of the Remote Sense Amplifier for Remote Sense of the regulated voltage. Connecting 1nF capacitor max vs. GND can help in reducing noise injection at this pin. If no Remote Sense is implemented, connect it directly to the regulated voltage in order to manage OVP, UVP and PGOOD. 13 13 ISEN1 Channel 1 current sense pin. The output current may be sensed across a sense resistor or across the low-side mosfet RdsON. This pin has to be connected to the low-side mosfet drain or to the sense resistor through a resistor Rg. The net connecting the pin to the sense point must be routed as close as possible to the PGNDS net in order to couple in common mode any picked-up noise. 14 14 PGNDS1 Channel 1 Power Ground sense pin. The net connecting the pin to the sense point must be routed as close as possible to the ISEN1 net in order to couple in common mode any picked-up noise. 15 15 PGNDS2 Channel 2 Power Ground sense pin. The net connecting the pin to the sense point must be routed as close as possible to the ISEN2 net in order to couple in common mode any picked-up noise. 16 16 ISEN2 Channel 2 current sense pin. The output current may be sensed across a sense resistor or across the low-side mosfet RdsON. This pin has to be connected to the low-side mosfet drain or to the sense resistor through a resistor Rg. The net connecting the pin to the sense point must be routed as close as possible to the PGNDS net in order to couple in common mode any picked-up noise. 17 18 OSC/INH FAULT Oscillator pin. It allows programming the switching frequency of each channel: the equivalent switching frequency at the load side results in being doubled. Internally fixed at 1.24V, the frequency is varied proportionally to the current sunk (forced) from (into) the pin with an internal gain of 6kHz/ µA (See relevant section for details). If the pin is not connected, the switching frequency is 150kHz for each channel (300kHz on the load). The pin is forced high (5V Typ.) when an Over Voltage is detected; to recover from this condition, cycle VCC. Forcing the pin to a voltage lower than 0.6V, the device stops operation and enters the inhibit state. 18 20 FBG Remote sense amplifier inverting input. It has to be connected to the negative side of the load to perform programmable remote sensing through apposite resistors (see relative section). 19 21 FBR Remote sense amplifier non-inverting input. It has to be connected to the positive side of the load to perform programmable remote sensing through apposite resistors (see relative section). Table 6. Pin Function (continued) N. (*) Name Description SO VFQFPN |
Аналогичный номер детали - L6712AQ |
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Аналогичное описание - L6712AQ |
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