Home Power management AC/DC & isolated DC/DC switching regulators PWM controllers

UC1856-SP

ACTIVE

Space-grade QMLV, 40-V input, 1.5-A dual-output 1-MHz PWM controller

Product details

Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 1000 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/7 Operating temperature range (°C) -55 to 125 Rating Space Gate drive (typ) (A) 1.5 Vin (max) (V) 40 Radiation, SEL (MeV·cm2/mg) Bipolar
Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 1000 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/7 Operating temperature range (°C) -55 to 125 Rating Space Gate drive (typ) (A) 1.5 Vin (max) (V) 40 Radiation, SEL (MeV·cm2/mg) Bipolar
CDIP (J) 16 135.3552 mm² 19.56 x 6.92 CFP (HKT) 16 72.136 mm² 10.16 x 7.1
  • Pin-for-Pin Compatible With the UC1846
  • 65-ns Typical Delay From Shutdown to Outputs,
    and 50-ns Typical Delay From SYNC to Outputs
  • Improved Current-Sense Amplifier With
    Reduced Noise Sensitivity
  • Differential Current Sense with 3-V Common-Mode Range
  • Trimmed-Oscillator Discharge Current for Accurate
    Deadband Control
  • Accurate 1-V Shutdown Threshold
  • High-Current Dual Totem-Pole Outputs (1.5-A peak)
  • TTL Compatible Oscillator SYNC Pin Thresholds
  • 4-kV ESD Protection
  • Pin-for-Pin Compatible With the UC1846
  • 65-ns Typical Delay From Shutdown to Outputs,
    and 50-ns Typical Delay From SYNC to Outputs
  • Improved Current-Sense Amplifier With
    Reduced Noise Sensitivity
  • Differential Current Sense with 3-V Common-Mode Range
  • Trimmed-Oscillator Discharge Current for Accurate
    Deadband Control
  • Accurate 1-V Shutdown Threshold
  • High-Current Dual Totem-Pole Outputs (1.5-A peak)
  • TTL Compatible Oscillator SYNC Pin Thresholds
  • 4-kV ESD Protection

The UC1856 is a high-performance version of the popular UC1846 series of current-mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input-to-output delays have been minimized, and the current sense output is slew-rate limited to reduce noise sensitivity. Fast 1.5-A peak output stages have been added to allow rapid switching of power FETs.

A low-impedance TTL-compatible sync output has been implemented with a TRI-STATE function when used as a sync input.

Internal-chip grounding has been improved to minimize internal noise caused when driving large capacitive loads. This improvement, in conjunction with the improved differential current-sense amplifier, results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead-time control; a 1-V 5% shutdown threshold; and 4-kV minimum electrostatic discharge (ESD) protection on all pins.

The UC1856 is a high-performance version of the popular UC1846 series of current-mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input-to-output delays have been minimized, and the current sense output is slew-rate limited to reduce noise sensitivity. Fast 1.5-A peak output stages have been added to allow rapid switching of power FETs.

A low-impedance TTL-compatible sync output has been implemented with a TRI-STATE function when used as a sync input.

Internal-chip grounding has been improved to minimize internal noise caused when driving large capacitive loads. This improvement, in conjunction with the improved differential current-sense amplifier, results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead-time control; a 1-V 5% shutdown threshold; and 4-kV minimum electrostatic discharge (ESD) protection on all pins.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
TPS7H5001-SP ACTIVE Radiation-hardened, QMLV and QMLP 2-MHz dual-output PWM controller with synchronous rectification More feature rich QML-qualified radiation-hardened PWM controller family
TPS7H5005-SEP ACTIVE Radiation-tolerant, 2-MHz, dual-output PWM controller with synchronous rectification More feature rich radiation-tolerant PWM controller family for LEO or shorter duration missions

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 11
Type Title Date
* Data sheet UC1856-SP Improved Current Mode PWM Controller datasheet 24 Apr 2014
* SMD UC1856-SP SMD 5962-94530 08 Jul 2016
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. A) 31 Aug 2023
Application note QML flow, its importance, and obtaining lot information (Rev. C) 30 Aug 2023
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. A) PDF | HTML 17 Nov 2022
Application note Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 19 Oct 2022
Selection guide TI Space Products (Rev. I) 03 Mar 2022
Application brief Controlling Input Power for Present and Next-Generation Power Controllers PDF | HTML 14 Dec 2020
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer 21 Aug 2020
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form PDF | HTML 18 May 2020
E-book Radiation Handbook for Electronics (Rev. A) 21 May 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Package Pins Download
CDIP (J) 16 View options
CFP (HKT) 16 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos