ZHCSK44G December   2009  – November 2022 UCC28C40-Q1 , UCC28C41-Q1 , UCC28C42-Q1 , UCC28C43-Q1 , UCC28C44-Q1 , UCC28C45-Q1

PRODUCTION DATA  

  1. 特性
  2. 应用
  3. 说明
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Detailed Pin Description
        1. 8.3.1.1 COMP
        2. 8.3.1.2 FB
        3. 8.3.1.3 CS
        4. 8.3.1.4 RT/CT
        5. 8.3.1.5 GND
        6. 8.3.1.6 OUT
        7. 8.3.1.7 VDD
        8. 8.3.1.8 VREF
      2. 8.3.2  Undervoltage Lockout
      3. 8.3.3  ±1% Internal Reference Voltage
      4. 8.3.4  Current Sense and Overcurrent Limit
      5. 8.3.5  Reduced-Discharge Current Variation
      6. 8.3.6  Oscillator Synchronization
      7. 8.3.7  Soft Start
      8. 8.3.8  Enable and Disable
      9. 8.3.9  Slope Compensation
      10. 8.3.10 Voltage Mode
    4. 8.4 Device Functional Modes
      1. 8.4.1 Normal Operation
      2. 8.4.2 UVLO Mode
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Custom Design With WEBENCH® Tools
        2. 9.2.2.2  Input Bulk Capacitor and Minimum Bulk Voltage
        3. 9.2.2.3  Transformer Turns Ratio and Maximum Duty CycleG
        4. 9.2.2.4  Transformer Inductance and Peak Currents
        5. 9.2.2.5  Output Capacitor
        6. 9.2.2.6  Current Sensing Network
        7. 9.2.2.7  Gate Drive Resistor
        8. 9.2.2.8  VREF Capacitor
        9. 9.2.2.9  RT/CT
        10. 9.2.2.10 Start-Up Circuit
        11. 9.2.2.11 Voltage Feedback Compensation
          1. 9.2.2.11.1 Power Stage Poles and Zeroes
          2. 9.2.2.11.2 Slope Compensation
          3. 9.2.2.11.3 Open-Loop Gain
          4. 9.2.2.11.4 Compensation Loop
      3. 9.2.3 Application Curves
      4. 9.2.4 Power Supply Recommendations
      5. 9.2.5 Layout
        1. 9.2.5.1 Layout Guidelines
          1. 9.2.5.1.1 Precautions
          2. 9.2.5.1.2 Feedback Traces
          3. 9.2.5.1.3 Bypass Capacitors
          4. 9.2.5.1.4 Compensation Components
          5. 9.2.5.1.5 Traces and Ground Planes
        2. 9.2.5.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 Custom Design With WEBENCH® Tools
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Related Links
    4. 10.4 支持资源
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 术语表
  11. 11Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

Electrical Characteristics

VVDD = 15 V(1), RRT = 10 kΩ, CCT = 3.3 nF, CVDD = 0.1 µF and no load on the outputs, TJ = –40°C to 150°C (unless otherwise noted).
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
REFERENCE
VVREFVREF voltage, initial accuracyIOUT = 1 mA4.955.1V
Line regulationVVDD = 12 V to 18 V0.220mV
Load regulation1 mA to 20 mA325mV
Temperature stabilitySee (2)0.20.4mV/°C
Total output variationSee (2)4.825.18V
VREF noise voltage10 Hz to 10 kHz, TJ = 25°C, see (2)50µV
Long term stability1000 hours, TJ = 125°C, see (2)525mV
IVREFOutput short circuit (source current)304555mA
OSCILLATOR
fOSCInitial accuracyTJ = 25°C, see (3)50.55355kHz
TJ = Full Range, see (3)50.557kHz
Voltage stability12 V ≤ VVDD ≤ 18 V0.2%1%
Temperature stabilityTJ(MIN) to TJ(MAX), see (2)1%2.5%
AmplitudeRT/CT pin peak-to-peak voltage1.9V
Discharge currentTJ = 25°C, VRT/CT = 2 V, see (4)7.78.49mA
TJ = Full Range, VRT/CT = 2 V, see (4)7.28.49.5
ERROR AMPLIFIER
VFBFeedback input voltage, initial accuracyTJ = 25°C, VCOMP = 2.5 V2.4752.52.525V
Feedback input voltage, total variationTJ = Full Range, VCOMP = 2.5 V2.452.52.55V
IFBInput bias current (source current)VFB = 5 V0.12µA
AVOLOpen-loop voltage gain2 V ≤ VOUT ≤ 4 V6590dB
Unity gain bandwidthSee (2)11.5MHz
PSRRPower supply rejection ratio12 V ≤ VVDD ≤ 18 V60dB
Output sink currentVFB = 2.7 V, VCOMP = 1.1 V214mA
Output source currentVFB = 2.3 V, VCOMP = 5 V0.51mA
VOHHigh-level COMP voltageVFB = 2.7 V, RCOMP = 15 kΩ COMP to GNDVREF - 0.2V
VOLLow-level COMP voltageVFB = 2.7 V, RCOMP = 15 kΩ COMP to VREF0.11.1V
CURRENT SENSE
ACSGainTJ = 25°C, See (5)(6)2.8533.15V/V
TJ = Full Range, See (5)(6)2.7533.15V/V
VCSMaximum input signalVFB < 2.4 V0.911.1V
PSRRPower supply rejection ratioVVDD = 12 V to 18 V(2)(5)70dB
ICSInput bias current (source current)0.12µA
tDCS to output delay3570ns
COMP to CS offsetVCS = 0 V1.15V
OUTPUT
VOUT(low)RDS(on) pulldownISINK = 200 mA5.515Ω
VOUT(high)RDS(on) pullupISOURCE = 200 mA1025Ω
tRISERise tImeCOUT = 1 nF2550ns
tFALLFall tImeCOUT = 1 nF2040ns
UNDERVOLTAGE LOCKOUT
VDDONStart thresholdUCC28C42-Q1, UCC28C44-Q113.514.515.5V
UCC28C43-Q1, UCC28C45-Q17.88.49
UCC28C40-Q1, UCC28C41-Q16.577.5
VDDOFFMinimum operating voltageUCC28C42-Q1, UCC28C44-Q18910V
UCC28C43-Q1, UCC28C45-Q177.68.2
UCC28C40-Q1, UCC28C41-Q16.16.67.1
PWM
DMAXMaximum duty cycleUCC28C42-Q1, UCC28C43-Q1, UCC28C40-Q1, VFB < 2.4 V94%96%
UCC28C44-Q1, UCC28C45-Q1, UCC28C41-Q1, VFB < 2.4 V47%48%
DMINMinimum duty cycleVFB > 2.6 V0%
CURRENT SUPPLY
ISTART-UPStart-up currentVVDD = VDDON – 0.5 V50100µA
IVDDOperating supply currentVFB = VCS = 0 V2.33mA
Adjust VVDD above the start threshold before setting at 15.5 V.
Ensured by design. Not production tested.
Output frequencies of the UCC28C41-Q1, UCC28C44-Q1, and the UCC28C45-Q1 are half the oscillator frequency.
Oscillator discharge current is measured with RRT = 10 kΩ to VREF.
Parameter measured at trip point of latch with VFB = 0 V.
Gain is defined as ACS = ΔVCOMP / ΔVCS , 0 V ≤ VCS ≤ 900 mV