Electronic Components Datasheet Search |
|
TPS2057D Datasheet(PDF) 4 Page - Texas Instruments |
|
TPS2057D Datasheet(HTML) 4 Page - Texas Instruments |
4 / 24 page TPS2047, TPS2057 TRIPLE CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES SLVS194 – APRIL 1999 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description power switch The power switch is an N-channel MOSFET with a maximum on-state resistance of 135 m Ω (VI(INx) = 5 V). Configured as a high-side switch, the power switch prevents current flow from OUTx to INx and INx to OUTx when disabled. The power switch can supply a minimum of 250 mA per switch. charge pump An internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input voltages as low as 2.7 V and requires very little supply current. driver The driver controls the gate voltage of the power switch. To limit large current surges and reduce the associated electromagnetic interference (EMI) produced, the driver incorporates circuitry that controls the rise times and fall times of the output voltage. The rise and fall times are typically in the 2-ms to 4-ms range. enable (ENx or ENx) The logic enable disables the power switch and the bias for the charge pump, driver, and other circuitry to reduce the supply current to less than 20 µA when a logic high is present on ENx (TPS2047) or a logic low is present on ENx (TPS2057). A logic zero input on ENx or logic high on ENx restores bias to the drive and control circuits and turns the power on. The enable input is compatible with both TTL and CMOS logic levels. overcurrent (OCx) The OCx open drain output is asserted (active low) when an overcurrent or over temperature condition is encountered. The output will remain asserted until the overcurrent or over temperature condition is removed. current sense A sense FET monitors the current supplied to the load. The sense FET measures current more efficiently than conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry sends a control signal to the driver. The driver in turn reduces the gate voltage and drives the power FET into its saturation region, which switches the output into a constant current mode and holds the current constant while varying the voltage on the load. thermal sense The TPS2047 and TPS2057 implement a dual-threshold thermal trip to allow fully independent operation of the power distribution switches. In an overcurrent or short-circuit condition the junction temperature rises. When the die temperature rises to approximately 140 °C, the internal thermal sense circuitry checks to determine which power switch is in an overcurrent condition and turns off that switch, thus, isolating the fault without interrupting operation of the adjacent power switches. Hysteresis is built into the thermal sense, and after the device has cooled approximately 20 degrees, the switch turns back on. The switch continues to cycle off and on until the fault is removed. The (OCx) open-drain output is asserted (active low) when overtemperature or overcurrent occurs. undervoltage lockout A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2 V, a control signal turns off the power switch. |
Similar Part No. - TPS2057D |
|
Similar Description - TPS2057D |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |