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UC1845A-SP датащи(PDF) 1 Page - Texas Instruments

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номер детали UC1845A-SP
подробное описание детали  QML Class V, Radiation Hardened Current-Mode PWM Controller
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1845A-SP датащи(HTML) 1 Page - Texas Instruments

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Total Ionizing Dose (TID), krad (Si)
0
5
10
15
20
25
30
35
40
45
4.94
4.95
4.96
4.97
4.98
4.99
5.00
5.01
5.02
5.03
5.04
D001
LDR UnBiased VIN = 32 V, ILOAD = 1 mA
LDR UnBiased VIN = 15 V, ILOAD = 1 mA
7
5
4
2
1
3
8
7
6
5
V
CC
Gnd
R
T/CT
V
FB
Comp
C/S
V
REF
5.0 V
50 mA
V
C
Output
Pwr
Ground
PWM
Latch
5-V
REF
S/R
UVLO
34 V
2.5 V
Osc
Error
Amplifier
2R
R
1 V
Current
Sense
Comparator
Internal
Bias
V
Good
Logic
REF
S
R
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
UC1845A-SP
SLUSC14 – MAY 2015
UC1845A-SP QML Class V, Radiation Hardened Current-Mode PWM Controller
1 Features
2 Applications
1
QML Class V (QMLV) Qualified, SMD 5962-86704
Radiation-Hardened DC-DC Converters
5962P8670411Vxx: (1)
Satellite Buses and Payloads
Space Launch Vehicles
Radiation Hardness Assurance (RHA) up to
30 kRAD (Si) Total Ionizing Dose (TID)
Undersea Cabling
Passes Functional and Specified Post-
Supports Various Topologies:
Radiation Parametric Limits at 45 kRAD at
Flyback, Forward, Buck, Boost
LDR (10 mRAD/s) per 1.5× over Test as
Push-Pull, Half-Bridge, Full Bridge With
Defined in MIL-STD-883 Test Method 1019.9
External Interface Circuit
Paragraph 3.13.3.b
Exhibits Low Dose Rate Sensitivity (2) But
3 Description
Remains Within the Pre-Radiation Electrical
The UC1845A-SP control IC is a radiation hardened
Limits at 30 krad Total Dose Level, as Allowed
pin-for pin compatible version of the UC184x family. It
by MIL-STD-883, TM1019
is primarily suited for Satellites and other harsh
Optimized for DC-to-DC Converter Applications
environment applications. Providing the necessary
features
to
control
current-mode
switched-mode
Low Start-Up Current (<0.5 mA)
power
supplies,
this
device
has
the
following
Trimmed Oscillator Discharge Current
improved features. Start up current is specified to be
Automatic Feed Forward Compensation
less than 0.5 mA. Oscillator discharge is trimmed to
8.3 mA. During UVLO, the output stage can sink at
Pulse-by-Pulse Current Limiting
least 10 mA at less than 1.2 V for VCC over 5 V.
Enhanced Load Response Characteristics
The Device Comparison Table shows the difference
Undervoltage Lockout (UVLO) With Hysteresis
between members of this family. Reference the
Double-Pulse Suppression
individual product data sheets for ordering the
High-Current Totem-Pole Output
radiation-improved version if available.
Internally-Trimmed Bandgap Reference
Device Information(1)
500-kHz Operation
PART NUMBER
PACKAGE
BODY SIZE (NOM)
Low RO Error Amplifier
CDIP/JG (8)
6.67 mm × 9.60 mm
Qualified over the Military Temperature Range
UC1845A-SP
LCCC/FK (20)
8.89 mm × 8.89 mm
(–55°C to 125°C)
CFP/HKU (10)
6.48 mm × 7.02 mm
(1)
Improved TID radiation performance only applies to RHA
device type 11.
(1) For all available packages, see the orderable addendum at
(2)
The affected parameter Reference Output Voltage, VREF
the end of the data sheet.
Radiation Drift Curve (see VREF Radiation Drift Curve).
VREF Radiation Drift Curve
4 Simplified Schematic
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.


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