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TPS2310IPW Datasheet(PDF) 3 Page - Texas Instruments |
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TPS2310IPW Datasheet(HTML) 3 Page - Texas Instruments |
3 / 27 page TPS2310 TPS2311 www.ti.com SLVS275H – FEBRUARY 2000 – REVISED JULY 2013 Table 2. Terminal Functions (continued) TERMINAL I/O DESCRIPTION NAME NO. ISET1 15 I Adjusts circuit-breaker threshold with resistor connected to IN1 ISET2 14 I Adjusts circuit-breaker threshold with resistor connected to IN2 PWRGD1 17 O Open-drain output, asserted low when VSENSE1 voltage is less than reference. PWRGD2 13 O Open-drain output, asserted low when VSENSE2 voltage is less than reference. TIMER 4 O Adjusts circuit-breaker deglitch time VREG 5 O Connects to bypass capacitor, for stable operation VSENSE1 7 I Power-good sense input channel 1 VSENSE2 6 I Power-good sense input channel 2 DETAILED DESCRIPTION DISCH1, DISCH2 – DISCH1 and DISCH2 should be connected to the sources of the external N-channel MOSFET transistors connected to GATE1 and GATE2, respectively. These pins discharge the loads when the MOSFET transistors are disabled. They also serve as reference-voltage connections for internal gate voltage- clamp circuitry. ENABLE or ENABLE – ENABLE for TPS2310 is active-low. ENABLE for TPS2311 is active-high. When the controller is enabled, both GATE1 and GATE2 voltages will power up to turn on the external MOSFETs. When the ENABLE pin is pulled high for TPS2310 or the ENABLE pin is pulled low for TPS2311 for more than 50 µs, the gate of the MOSFET is discharged at a controlled rate by a current source, and a transistor is enabled to discharge the output bulk capacitance. In addition, the device turns on the internal regulator PREREG (see VREG) when enabled and shuts down PREREG when disabled so that total supply current is less than 5 μA. FAULT – FAULT is an open-drain overcurrent flag output. When an overcurrent condition in either channel is sustained long enough to charge TIMER to 0.5 V, both channels latch off and pull this pin low. In order to turn the device back on, either the enable pin has to be toggled or the input power has to be cycled. GATE1, GATE2 – GATE1 and GATE2 connect to the gates of external N-channel MOSFET transistors. When the device is enabled, internal charge-pump circuitry pulls these pins up by sourcing approximately 15 μA to each. The turnon slew rates depend upon the capacitance present at the GATE1 and GATE2 terminals. If desired, the turnon slew rates can be further reduced by connecting capacitors between these pins and ground. These capacitors also reduce inrush current and protect the device from false overcurrent triggering during powerup. The charge-pump circuitry generates gate-to-source voltages of 9 V–12 V across the external MOSFET transistors. IN1, IN2 – IN1 and IN2 should be connected to the power sources driving the external N-channel MOSFET transistors connected to GATE1 and GATE2, respectively. The TPS2310/TPS2311 draws its operating current from IN1, and both channels remains disabled until the IN1 power supply has been established. The IN1 channel has been constructed to support 3-V, 5-V, or 12-V operation, while the IN2 channel has been constructed to support 3-V or 5-V operation ISENSE1, ISENSE2, ISET1, ISET2 – ISENSE1 and ISENSE2, in combination with ISET1 and ISET2, implement overcurrent sensing for GATE1 and GATE2. ISET1 and ISET2 set the magnitude of the current that generates an overcurrent fault, through external resistors connected to ISET1 and ISET2. An internal current source draws 50 μA from ISET1 and ISET2. With a sense resistor from IN1 to ISENSE1 or from IN2 to ISENSE2, which is also connected to the drains of external MOSFETs, the voltage on the sense resistor reflects the load current. An overcurrent condition is assumed to exist if ISENSE1 is pulled below ISET1 or if ISENSE2 is pulled below ISET2. To ensure proper circuit breaker operation, VI(ISENSE1) and VI(ISET1) should never exceed VI(IN1). Similarly, VI(ISENSE2) and VI(ISET2) should never exceed VI(IN2). Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: TPS2310 TPS2311 |
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