Electronic Components Datasheet Search |
|
UC2914DWTR Datasheet(PDF) 6 Page - Texas Instruments |
|
UC2914DWTR Datasheet(HTML) 6 Page - Texas Instruments |
6 / 24 page UC2914 UC3914 SLUS425C − DECEMBER 2003 − REVISED JULY 2004 6 www.ti.com TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION CT 15 I/O A capacitor is connected to this pin in order to set the maximum fault time. The minimum fault time must be more than the time to charge external load capacitance. The fault time is defined as shown in equation (1) where ICH = 100 µA + IPL, where IPL is the current into the power limit pin. Once the fault time is reached the output shuts down for a time given by equation (2) where IDIS is nominally 3 µA.. FAULT 10 O Open collector output which pulls low upon any of the following conditions: timer fault, shutdown, UVLO. This pin MUST be pulled up to VVCC or another supply through a suitable impedance. GND 1 − Ground reference for the device. IMAX 16 I This pin programs the maximum allowable sourcing current. Since REF is a −2-V reference (with respect to VCC), a voltage divider can be derived from VCC to REF in order to generate the program level for the IMAX pin. The current level at which the output appears as a current source is equal to the voltage on the IMAX pin, with respect to VCC, divided by the current sense resistor. If desired, a controlled current startup can be pro- grammed with a capacitor on IMAX to VCC. LR 13 I If this pin is held high and a fault occurs, the timer is prevented from resetting the fault latch when CT is dis- charged below the reset comparator threshold. The part does not retry until this pin is brought to a logic low or a power-on-reset occurs. Pulling this pin low before the reset time is reached does not clear the fault until the reset time is reached. Floating or holding this pin low results in the part repeatedly trying to reset itself if a fault occurs. OUT 11 O Output drive to the MOSFET pass element. Internal clamping ensures that the maximum VGS drive is 15 V. OSC 6 O Complementary output drivers for intermediate charge pump stages. A 0.01- µF capacitor should be placed OSCB 5 O Complementary output drivers for intermediate charge pump stages. A 0.01- µF capacitor should be placed between OSC and PMP, and OSCB and PMPB. PLIM 14 I This feature ensures that the average MOSFET power dissipation is controlled. A resistor is connected from this pin to VCC. Current flows into PLIM, adding to the fault timer charge current, reducing the duty cycle from the typical 3% level. When IPL >> 100 µA then the average MOSFET power dissipation is given by equation (3). PMP 9 I Complementary pins which couple charge pump capacitors to internal diodes and are used to provide charge PMPB 8 I Complementary pins which couple charge pump capacitors to internal diodes and are used to provide charge to the reservoir capacitor tied to VPUMP. Typical capacitor values used are 0.01- µF. REF 18 O −2-V reference with respect to VCC used to program the IMAX pin voltage. A 0.1- µF ceramic or tantalum ca- pacitor MUST be tied between this pin and VCC to ensure proper operation of the device. SD 4 I When this TTL-compatible input is brought to a logic low, the output of the linear amplifier is driven low, FAULT is pulled low and the device is put into a low power mode. The ABSOLUTE maximum voltage that can be placed on this pin is 12 V. SENSE 17 I Input voltage from the current sense resistor. When there is greater than 50 mV on this pin with respect to VCC, a fault is sensed and CT begins to charge. VCC 2 I Input voltage to the device. The voltage range is from 4.5 V to 35 V. The minimum input voltage required for operation is 4.5 V. VOUTS 12 O Source connection of external N-channel MOSFET and sensed output voltage of load. VPUMP 7 O Charge pump output voltage. A capacitor should be tied between this pin and VOUTS with a typical value be- ing 0.01- µF. T FAULT + 2 C T I CH T SD + 2 C T I DIS P FET(avg) + IMAX 3 10*6 R PL (1) (2) (3) |
Similar Part No. - UC2914DWTR |
|
Similar Description - UC2914DWTR |
|
|
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 |