SLUS270G March   1999  – May 2020 UCC2800 , UCC2801 , UCC2802 , UCC2803 , UCC2804 , UCC2805

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Detailed Pin Description
        1. 9.3.1.1 COMP
        2. 9.3.1.2 FB
        3. 9.3.1.3 CS
        4. 9.3.1.4 RC
        5. 9.3.1.5 GND
        6. 9.3.1.6 OUT
        7. 9.3.1.7 VCC
        8. 9.3.1.8 Pin 8 (REF)
      2. 9.3.2  Undervoltage Lockout (UVLO)
      3. 9.3.3  Self-Biasing, Active Low Output
      4. 9.3.4  Reference Voltage
      5. 9.3.5  Oscillator
      6. 9.3.6  Synchronization
      7. 9.3.7  PWM Generator
      8. 9.3.8  Minimum Off-Time Setting (Dead-Time Control)
      9. 9.3.9  Leading Edge Blanking
      10. 9.3.10 Minimum Pulse Width
      11. 9.3.11 Current Limiting
      12. 9.3.12 Overcurrent Protection and Full Cycle Restart
      13. 9.3.13 Soft Start
      14. 9.3.14 Slope Compensation
    4. 9.4 Device Functional Modes
      1. 9.4.1 Normal Operation
      2. 9.4.2 UVLO Mode
      3. 9.4.3 Soft Start Mode
      4. 9.4.4 Fault Mode
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Current Sensing Network
        2. 10.2.2.2 Gate Drive Resistor
        3. 10.2.2.3 Vref Capacitor
        4. 10.2.2.4 RTCT
        5. 10.2.2.5 Start-Up Circuit
        6. 10.2.2.6 Voltage Feedback Compensation
          1. 10.2.2.6.1 Power Stage Gain, Zeroes, and Poles
          2. 10.2.2.6.2 Compensation Loop
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Support Resources
    2. 13.2 Trademarks
    3. 13.3 Electrostatic Discharge Caution
    4. 13.4 Glossary
    5. 13.5 Related Links
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.5 Electrical Characteristics

–40°C ≤ TA ≤ 125°C for UCC280x. VCC = 10 V(1), RT = 100 k from REF to RC, CT = 330 pF from RC to GND, 0.1-uF capacitor from VCC to GND, 0.1-uF capacitor from VREF to GND, and TA= TJ (unless otherwise noted).
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
REFERENCE
Output voltageTJ= 25°C, I = 0.2 mA, UCC2800, UCC2801, UCC2802, and UCC28044.92555.075V
TJ= 25°C, I = 0.2 mA, UCC2803 and UCC28053.9444.06
Load regulation0.2 mA < I < 5 mAUCC280x1030mV
Line regulationTJ = 25°C, VCC = 10 V to clamp (IVCC = 25 mA)1.9mV/V
TJ = –40°C to 125°C, VCC = 10 V to clamp (IVCC = 25 mA)UCC280x2.5
Total variationUCC2800, UCC2801, UCC2802, and UCC2804(5)4.8855.1V
UCC2803 and UCC2805(5)3.944.08
Output noise voltage10 Hz ≤ f ≤ 10 kHz, TJ= 25°C(7)130µV
Long term stabilityTA = 125°C, 1000 hours(7)5mV
Output short circuit–5–35mA
OSCILLATOR
Oscillator frequencyUCC2800, UCC2801, UCC2802, UCC2804(2)404652kHz
UCC2803 and UCC2805(2)263136
Temperature stability(7)2.5%
Amplitude peak-to-peak2.252.42.55V
Oscillator peak voltage2.45V
ERROR AMPLIFIER
Input voltageCOMP = 2.5 V, UCC2800, UCC2801, UCC2802, and UCC28042.442.52.56V
COMP = 2 V, UCC2803 and UCC28051.9522.05
Input bias current–11µA
Open loop voltage gain6080dB
COMP sink currentFB = 2.7 V, COMP = 1.1 VUCC280x0.33.5mA
COMP source currentFB = 1.8 V, COMP = REF – 1.2 V–0.2–0.5–0.8mA
Gain bandwidth product(7)2MHz
PWM
Maximum duty cycleUCC2800, UCC2802, and UCC28039799100%
UCC2801, UCC2804, and UCC2805484950
CURRENT SENSE
Gain(3)1.11.651.8V/V
Maximum input signalCOMP = 5 V(4)0.911.1V
Input bias current–200200nA
CS blank time50100150ns
Overcurrent threshold1.421.551.68V
COMP to CS offsetCS = 0 V0.450.91.35V
OUTPUT
OUT low levelI = 20 mA, all parts0.10.4V
I = 200 mA, all parts0.350.9
I = 50 mA, VCC = 5 V, UCC2803 and UCC28050.150.4
I = 20 mA, VCC = 0 V, all parts0.71.2
OUT high VSAT (VCC-OUT)I = 20 mA, all parts0.150.4V
I = 200 mA, all parts11.9
I = 50 mA, VCC = 5 V, UCC2803 and UCC28050.40.9
Rise timeCL = 1 nF4170ns
Fall timeCL = 1 nF4475ns
UNDERVOLTAGE LOCKOUT
Start threshold(6)UCC28006.67.27.8V
UCC28018.69.410.2
UCC2802 and UCC280411.512.513.5
UCC2803 and UCC28053.74.14.5
Stop threshold(6)UCC28006.36.97.5V
UCC28016.87.48
UCC2802 and UCC28047.68.39
UCC2803 and UCC28053.23.64
Start to stop hysteresisUCC28000.120.30.48V
UCC28011.622.4
UCC2802 and UCC28043.54.25.1
UCC2803 and UCC28050.20.50.8
SOFT START
COMP rise timeFB = 1.8 V, rise from 0.5 V to REF – 1 V410ms
OVERALL
Start-up currentVCC < start threshold0.10.2mA
Operating supply currentFB = 0 V, CS = 0 V0.51mA
VCC internal Zener voltageICC = 10 mA(6)(8)1213.515V
VCC internal Zener voltage minus start threshold voltageUCC2802 and UCC2804(6)0.51V
(1) Adjust VCC above the start threshold before setting at 10 V.
(2) Oscillator frequency for the UCCx800, UCC2802, and UCC2803 is the output frequency. Oscillator frequency for the UCC2801, UCC2804, and UCC2805 is twice the output frequency.
(3) Gain is defined by: A = ΔVCOMP / Δ VCS. 0 ≤ VCS ≤ 0.8 V
(4) Parameter measured at trip point of latch with Pin 2 at 0 V.
(5) Total variation includes temperature stability and load regulation.
(6) Start threshold, stop threshold, and Zener shunt thresholds track one another.
(7) Ensured by design. Not 100% tested in production.
(8) The device is fully operating in clamp mode, as the forcing current is higher than the normal operating supply current.