Electronic Components Datasheet Search |
|
UCC3813-0 Datasheet(PDF) 4 Page - Texas Instruments |
|
|
UCC3813-0 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 8 page 4 UCC2813-0/-1/-2/-3/-4/-5 UCC3813-0/-1/-2/-3/-4/-5 ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for –40°C ≤ TA ≤ +85°C for UCC2813-x; 0°C ≤ TA ≤ +70°C for UCC3813-x; VCC = 10V (Note 3); RT = 100k from REF to RC; CT=330pF from RC to GND; 0.1 µF capacitor from VCC to GND; 0.1µF capacitor from VREF to GND. TA =TJ. PARAMETER TEST CONDITIONS UCC2813-x UCC3813-x UNITS MIN TYP MAX Soft Start Section COMP Rise Time FB = 1.8V, Rise from 0.5V to REF–1V 4 ms Overall Section Start-up Current VCC < Start Threshold 0.1 0.23 mA Operating Supply Current FB = 0V, CS = 0V, RC = 0V 0.5 1.2 mA VCC Internal Zener Voltage ICC = 10mA (Note 8) 12 13.5 15 V VCC Internal Zener Voltage Minus Start Threshold Voltage UCCx813-2/-4 0.5 1.0 V Note 3: Adjust VCC above the start threshold before setting at 10V. Note 4: Oscillator frequency for the UCCx813-0, UCCx813-2 and UCCx813-3 is the output frequency. Oscillator frequency for the UCCx813-1, UCCx813-4 and UCCx813-5 is twice the output frequency. Note 5: Gain is defined by: A V V VV COMP CS CS ≤≤ 00 8 . . Note 6: Parameter measured at trip point of latch with Pin 2 at 0V. Note 7: Total Variation includes temperature stability and load regulation. Note 8: Start Threshold, Stop Threshold and Zener Shunt Thresholds track one another. Note 9: Guaranteed by design. Not 100% tested in production. COMP: COMP is the output of the error amplifier and the input of the PWM comparator. Unlike other devices, the error amplifier in the UCC3813 family is a true, low output-impedance, 2MHz operational amplifier. As such, the COMP terminal can both source and sink current. However, the error amplifier is internally current limited, so that you can command zero duty cycle by externally forcing COMP to GND. The UCC3813 family features built-in full cycle Soft Start. Soft Start is implemented as a clamp on the maximum COMP voltage. FB: FB is the inverting input of the error amplifier. For best stability, keep FB lead length as short as possible and FB stray capacitance as small as possible. CS: CS is the input to the current sense comparators. The UCC3813 family has two different current sense comparators: the PWM comparator and an over-current comparator. The UCC3813 family contains digital current sense filter- ing, which disconnects the CS terminal from the current sense comparator during the 100ns interval immediately following the rising edge of the OUT pin. This digital filter- ing, also called leading-edge blanking, means that in most applications, no analog filtering (RC filter) is re- quired on CS. Compared to an external RC filter tech- nique, the leading-edge blanking provides a smaller effective CS to OUT propagation delay. Note, however, that the minimum non-zero On-Time of the OUT signal is directly affected by the leading-edge-blanking and the CS to OUT propagation delay. The over-current comparator is only intended for fault sensing, and exceeding the over-current threshold will cause a soft start cycle. RC: RC is the oscillator timing pin. For fixed frequency operation, set timing capacitor charging current by con- necting a resistor from REF to RC. Set frequency by con- necting a timing capacitor from RC to GND. For best performance, keep the timing capacitor lead to GND as short and direct as possible. If possible, use separate ground traces for the timing capacitor and all other func- tions. PIN DESCRIPTIONS |
Similar Part No. - UCC3813-0 |
|
Similar Description - UCC3813-0 |
|
|
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 |