SLUSDD4B April   2019  – December 2020

PRODUCTION DATA  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 UVLO
      2. 7.3.2 Reference
      3. 7.3.3 Totem-Pole Output
    4. 7.4 Device Functional Modes
  8. Application Information Disclaimer
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Switching Frequency
        2. 8.2.2.2 Transformer
        3. 8.2.2.3 RCD Diode Clamp
        4. 8.2.2.4 Output Diode
        5. 8.2.2.5 Output Filter and Capacitor
        6. 8.2.2.6 Compensation
        7. 8.2.2.7 Sense Resistor and Slope Compensation
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Feedback Traces
      2. 10.1.2 Input/Output Capacitors
      3. 10.1.3 Compensation Components
      4. 10.1.4 Traces and Ground Planes
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Electrical Characteristics

VCC = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted)
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
REFERENCE
Output voltageTJ = 25°C, IO = 1 mA4.8555.1V
Line regulationVIN = 12 to 25 V620mV
Load regulationIO = 1 to 20 mA625mV
Temperature stability(2)(3)0.20.4mV/°C
Total output variation(2)Over line, load, and temperature4.855.1V
Output noise voltage10 Hz ≤ ƒ ≤ 10 kHz, TJ = 25°C50μV
Long-term stability1000 hours, TA = 125°C(2)525mV
Short-circuit output current–30–100–180mA
OSCILLATOR
Initial accuracyTJ = 25°C(4)475257kHz
Voltage stabilityVCC = 12 to 25 V0.2%1%
Temperature stabilityTJ = –55°C to 125°C(2)5%
Amplitude peak-to-peakV pin 4(2)1.7V
Discharge currentV pin 4 = 2 V(5)TJ = 25°C7.88.38.8mA
TJ = Full range7.58.8
ERROR AMPLIFIER
Input voltageVComp = 2.5 V2.452.502.55V
Input bias current–0.3–1μA
Open-loop voltage gainVO = 2 to 4 V6590dB
Unity-gain bandwidthTJ = 25°C(2)0.71MHz
PSRRVCC = 12 to 25 V6070dB
Output sink currentVFB = 2.7 V, VComp = 1.1 V26mA
Output source currentVFB = 2.3 V, VComp = 5 V–0.5–0.8mA
High-level output voltageVFB = 2.3 V, RL = 15 kΩ to ground56V
Low-level output voltageVFB = 2.7 V, RL = 15 kΩ to VREF0.71.1V
CURRENT SENSE
Gain(6)(7)2.8533.15V/V
Maximum input signalVComp = 5 V(6)0.911.1V
PSRRVCC = 12 to 25 V(6)70dB
Input bias current–2–10μA
Delay to outputVISENSE = 0 to 2 V(2)150300ns
OUTPUT
Output low-level voltageISINK = 20 mA0.10.4V
ISINK = 200 mA1.52.2
Output high-level voltageISOURCE = –20 mA1313.5V
ISOURCE = –200 mA1213.5
Rise timeCL = 1 nF, TJ = 25°C(2)50150ns
Fall timeCL = 1 nF, TJ = 25°C(2)50150ns
UVLO saturationVCC = 5 V, ISINK = 10 mA0.71.2V
UNDERVOLTAGE LOCKOUT
Start threshold7.88.49V
Minimum operation voltage after turnon77.68.2V
PWM
Maximum duty cycle94%96%100%
Minimum duty cycle0%
TOTAL STANDBY CURRENT
Start-up current0.30.5mA
Operating supply currentVFB = VISENSE = 0 V1117mA
VCC Zener voltageICC = 25 mA3034V
Adjust VCC above the start threshold before setting at 15 V.
Parameters ensured by design and/or characterization, if not production tested.
Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
Temperature Stability = VREF (max) – VREF (min) / TJ (max) – TJ (min). VREF (max) and VREF (min) are the maximum and minimum reference voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature.
Output frequency equals oscillator frequency.
This parameter is measured with RT = 10 kΩ to VREF. This contributes approximately 300 μA of current to the measurement. The total current flowing into the RT or CT pin will be approximately 300 μA higher than the measured value.
Parameter measured at trip point of latch with VFB = 0 V.
Gain defined as: G = ΔVComp / ΔVISENSE; VISENSE = 0 to 0.8 V.