 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
UCC25710 Datasheet(PDF) 8 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
UCC25710 Datasheet(HTML) 8 Page - Texas Instruments |
|
|
8 / 34 page  1 2 3 4 5 6 7 8 20 19 18 17 16 15 14 13 DW Package (Top View) VCC FMIN GD1 FMAX GD2 SS GND ICOMP VREF CS LEDSW CREF DTY DSR DADJ CL 9 10 12 11 DIM OV BLON UV UCC25710 SLUSAD7A – APRIL 2011 – REVISED MAY 2011 www.ti.com SOIC 20-Pin (DW) Top View Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. BackLight ON is an enable signal for the control device. The signal is active high with a BLON 10 I threshold of approx 1.2 V. The 5-V reference (VREF) is enabled with BLON which is the bias supply for many of the internal blocks of the device. Current Limit input connects to a signal that represents the power converter ’s input current. CL 13 I Dual thresholds provide a shutdown retry or latch-off response. Current REFerence is used to set the regulating voltage for the LED current feedback signal at the CS input. This voltage input is set using a resistor divider from VREF. A nominal level of around 0.7 V is recommended although a range of 0.6 V to 2.7 V is accommodated. CREF 15 I Internal reference levels of 0.5 V and 2.8 V replace the CREF input voltage at the current amplifier when the CREF pin voltage is respectively below or above these levels. The 0.5-V internal reference can be achieved by shorting CREF to ground, the internal 2.8-V reference can be achieved by shorting CREF to VREF. Current Sense input monitors the LED current. This signal is compared to VCREF by the CS 16 I current amplifier to regulate the total LED current. A capacitor to ground at the Duty-cycle ADJust input sets the positive slope of a saw tooth waveform that is compared to a voltage proportional to 1-D where D is the dimming PWM DADJ 8 I/O duty-cycle of the DIM input. At the falling edge of the DIM input this comparison is used to extend the LLC on time beyond the on time of the LED series switch. A PWM input signal at the DIMming pin controls the average load current by cycling on and off both an external series LED switch and the gate drives to the LLC converter. A high on DIM 9 I this pin corresponds to an ON condition. The controller will ignore a low condition at this input during start up or fault recovery until after the completion of a soft-start sequence. The Dimming Slew Rate pin is used to limit the rate of the VCO frequency change at the LLC on or off edges of a dimming PWM cycle. A capacitor to ground at this pin programs the DSR 14 I/O maximum positive and negative slew rates that appear at the control input to the VCO. Pulling this pin below about 0.8 V will disable the GD outputs. The DuTY-cycle pin is averaged with a capacitor to ground to form a 1-D proportional DTY 7 I/O voltage that is compared to the DADJ saw tooth voltage. The average voltage at this pin will be 2.5 V(1-D)+0.1 V, where D is the dimming PWM duty-cycle the DIM input. The MAXimum Frequency of the LLC converter is set by a resistor to ground at this pin. It FMAX 19 I/O is actually the difference between the maximum and minimum frequency that is set by this resistor. FMIN 20 I/O The MINimum Frequency of the LLC converter is set by a resistor to ground at this pin. Gate Drive outputs operate 180 ° out of phase with a fixed 500 ns of dead time. They GD1 &2 2, 3 O typically will drive either primary end of a gate drive transformer. At start up or during a fault recovery, initiating the LLC converter begins with GD2 turning on first. 8 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): UCC25710 |
Similar Part No. - UCC25710_15 |
|
Similar Description - UCC25710_15 |
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
