SLUS334F August   1995  – August 2022 UC1823A , UC1825A , UC2823A , UC2823B , UC2825A , UC2825B , UC3823A , UC3823B , UC3825A , UC3825B

PRODUCTION DATA  

  1. 1Features
  2. 2Description
  3. 3Revision History
  4. 4Ordering Information
  5. 5Pin Configuration and Functions
    1.     Terminal Functions
  6. 6Specifications
    1. 6.1 ABSOLUTE MAXIMUM RATINGS
    2. 6.2 Thermal Information
    3. 6.3 ELECTRICAL CHARACTERISTICS
    4. 6.4 ELECTRICAL CHARACTERISTICS
  7. 7Application and Implementation
    1. 7.1 LEADING EDGE BLANKING
    2. 7.2 UVLO, SOFT-START AND FAULT MANAGEMENT
    3. 7.3 ACTIVE LOW OUTPUTS DURING UVLO
    4. 7.4 CONTROL METHODS
    5. 7.5 SYNCHRONIZATION
    6. 7.6 HIGH CURRENT OUTPUTS
    7. 7.7 GROUND PLANES
    8. 7.8 OPEN LOOP TEST CIRCUIT
  8. 8Device and Documentation Support
    1. 8.1 Documentation Support
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  9. 9Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • J|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.4 ELECTRICAL CHARACTERISTICS

TA = –55°C to 125°C for the UC1823A/UC1825A, TA = –40°C to 85°C for the UC2823x/UC2825x, TA = 0°C to 70°C for the UC3823x/UC3825x, RT = 3.65 kΩ, CT = 1 nF, VCC = 12 V, TA = TJ (unless otherwise noted)
PARAMETERTEST CONDITIIONSMINTYPMAXUNIT
PWM COMPARATOR
IBIASBias current, RAMPVRAMP = 0 V–1–8μA
Minimum duty cycle0%
Maximum duty cycle85%
tLEBLeading edge blanking timeRLEB = 2 kΩ, CLEB = 470 pF300375450ns
RLEBLeading edge blanking resistanceVCLK/LEB = 3 V8.510.011.5kΩ
VZDCZero dc threshold voltage, EAOUTVRAMP = 0 V1.101.251.4V
tDELAYDelay-to-output time(1)VEAOUT = 2.1 V, VILIM = 0 V to 2 V step5080ns
CURRENT LIMIT / START SEQUENCE / FAULT
ISSSoft-start charge currentVSS= 2.5 V81420μA
VSSFull soft-start threshold voltage4.35V
IDSCHRestart discharge currentVSS= 2.5 V100250350μA
ISSRestart threshold voltage0.30.5V
IBIASILIM bias currentVILIM = 0 V to 2 V step15µA
ICLCurrent limit threshold voltage0.9511.05V
Overcurrent threshold voltage1.141.21.26
tdDelay-to-output time, ILIM(1)VILIM = 0 V to 2 V step5080ns
OUTPUT
Low-level output saturation voltageIOUT = 20 mA0.250.4V
IOUT = 200 mA1.22.2
High-level output saturation voltageIOUT = -20 mA1.92.9
IOUT = -200 mA23
tr, tfRise/fall time(1)CL = 1 nF2045ns
UNDERVOLTAGE LOCKOUT (UVLO)
Start threshold voltageUC2823B, UC2825B, UC3825B, UC3825B1617V
UC1823A, UC1825A, UC2823A, UC2825A UC3825A, UC3825A8.49.29.6
Stop threshold voltageUC2823B, UC2825B, UC3825B, UC3825B910
OVLO hysteresisUC1823A, UC1825A, UC2823A, UC2825A UC3825A, UC3825A0.40.81.2
UC2823B, UC2825B, UC3825B, UC3825B567
SUPPLY CURRENT
IsuStartup currentVC = VCC = VTH(start) –0.5 V100300μA
ICCInput current2836mA
(1) Ensured by design. Not production tested.