UC1825A-SP Controller Datasheet

UC1825A-SP Datasheet, PDF, Equivalent


Part Number

UC1825A-SP

Description

Radiation Hardened High-Speed PWM Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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UC1825A-SP
SLUS873C – JANUARY 2009 – REVISED DECEMBER 2016
UC1825A-SP Class-V, Radiation Hardened High-Speed PWM Controller
1 Features
1 QML-V Qualified, SMD 5962-87681
• 5962P8768105Vxx:
– Radiation Hardness Assurance (RHA) up to
30-krad(Si) Total Ionizing Dose (TID)
– Passes Functional and Specified Post-
Radiation Parametric Limits at 45 krad at LDR
(10 mrad(Si)/s) per 1.5× Over Test as Defined
in MIL-STD-883 Test Method 1019.9
Paragraph 3.13.3.b
– Exhibits Low Dose Rate Sensitivity but
Remains Within the Pre-Radiation Electrical
Limits at 30-krad Total Dose Level, as Allowed
by MIL-STD-883, TM1019
• Compatible With Voltage-Mode or Current-Mode
Control Methods
• Practical Operation at Switching Frequencies
to 1 MHz
• 50-ns Propagation Delay to Output
• High-Current Dual Totem Pole Outputs
(2-A Peak)
• Trimmed Oscillator Discharge Current
• Low 100-μA Start-Up Current
• Pulse-by-Pulse Current Limiting Comparator
• Latched Overcurrent Comparator With Full Cycle
Restart
• Qualified Over the Military Temperature Range
(–55°C to 125°C)
2 Applications
• Radiation-Hardened DC-DC Converters
• Satellite Buses and Payloads
• Space Launch Vehicles
• Undersea Cabling
• Supports Various Topologies:
– Flyback, Forward, Buck, Boost
– Push-Pull, Half-Bridge, Full Bridge With
External Interface Circuit
3 Description
The UC1825A-SP PWM controller is a radiation
hardened version of the standard UC1825 family.
Performance enhancements have been made to
several of the circuit blocks. Error amplifier gain
bandwidth product is 12 MHz, while input offset
voltage is 2 mV. Current limit threshold is assured to
a tolerance of 5%. Oscillator discharge current is
specified at 10 mA for accurate dead time control.
Frequency accuracy is improved to 6%. Start-up
supply current, typically
100 μA, is ideal for offline applications. The output
drivers are redesigned to actively sink current during
UVLO at no expense to the start-up current
specification. In addition each output is capable of
2-A peak currents during transitions.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UC1825A-SP
CDIP (16)
19.56 mm × 6.92 mm
CDIP (16)
UC1825A-SP RHA
CFP (16)
19.56 mm × 6.92 mm
10.16 mm × 7.10 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram
CLK / LEB 4
RT 5
CT 6
RAMP 7
EAOUT 3
NI 2
INV 1
OSC
1.25 V
E/A
(60%)
PWM Comparator
13 VC
11 OUTA
RT
SD PWM Latch
14 OUTB
12 PGND
9 μA
SS 8
ILIM 9
VCC 15
GND 10
1V
1.2 V
0.2 V
9.2 V / 8.4 V
Current
Limit
5V
Overcurrent
SD
Restart
Delay
R
Fault Latch
UVLO
VREF
5.1 V
On / Off
4V
Soft Start Complete
VREF Good
Restart
Delay
Latch
S
R
250 μA
Internal
Bias
16 5.1 VREF
UDG-02091
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

UC1825A-SP
UC1825A-SP
SLUS873C – JANUARY 2009 – REVISED DECEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics .............................................. 7
8 Detailed Description .............................................. 8
8.1 Overview ................................................................... 8
8.2 Functional Block Diagram ......................................... 8
8.3 Feature Description................................................... 8
8.4 Device Functional Modes........................................ 13
9 Application and Implementation ........................ 14
9.1 Application Information............................................ 14
9.2 Typical Application .................................................. 15
10 Power Supply Recommendations ..................... 32
11 Layout................................................................... 32
11.1 Layout Guidelines ................................................. 32
11.2 Layout Example .................................................... 33
12 Device and Documentation Support ................. 34
12.1 Device Support...................................................... 34
12.2 Documentation Support ....................................... 34
12.3 Receiving Notification of Documentation Updates 34
12.4 Community Resources.......................................... 34
12.5 Trademarks ........................................................... 34
12.6 Electrostatic Discharge Caution ............................ 34
12.7 Glossary ................................................................ 34
13 Mechanical, Packaging, and Orderable
Information ........................................................... 34
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (October 2015) to Revision C
Page
• Added new RHA features ....................................................................................................................................................... 1
• Added new RHA packages to Device Information table......................................................................................................... 1
• Added new HKT pin diagram to Pin Configuration and Functions section ............................................................................ 4
• Changed TJ MIN from –40°C : to –55°C ................................................................................................................................ 5
• Added Receiving Notification of Documentation Updates section to Device and Documentation Support section............. 34
Changes from Revision A (January 2009) to Revision B
Page
• Added ESD Ratings table, Thermal Information table, Feature Description section, Device Functional Modes,
Application and Implementation section, Power Supply Recommendations section, Layout section, Device and
Documentation Support section, and Mechanical, Packaging, and Orderable Information section....................................... 1
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Copyright © 2009–2016, Texas Instruments Incorporated
Product Folder Links: UC1825A-SP


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community UC1825A-SP SLUS873C – JANU ARY 2009 – REVISED DECEMBER 2016 UC18 25A-SP Class-V, Radiation Hardened High -Speed PWM Controller 1 Features •1 QML-V Qualified, SMD 5962-87681 • 596 2P8768105Vxx: – Radiation Hardness As surance (RHA) up to 30-krad(Si) Total I onizing Dose (TID) – Passes Functiona l and Specified PostRadiation Parametri c Limits at 45 krad at LDR (10 mrad(Si) /s) per 1.5× Over Test as Defined in M IL-STD-883 Test Method 1019.9 Paragraph 3.13.3.b – Exhibits Low Dose Rate Se nsitivity but Remains Within the Pre-Ra diation Electrical Limits at 30-krad To tal Dose Level, as Allowed by MIL-STD-8 83, TM1019 • Compatible With Voltage- Mode or Current-Mode Control Methods Practical Operation at Switching Freq uencies to 1 MHz • 50-ns Propagation Delay to Output • High-Current Dual T otem Pole Outputs (2-A Peak) • Trimme d Oscillator Discharge Current • Low 100-μA Start-Up Current • Pulse-by-Pulse Current Li.
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