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UC1825A-SP Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza UC1825A-SP
Descripción Electrónicos  Rad-Tolerant Class-V, High-Speed PWM Controller
Download  39 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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UC1825A-SP Datasheet(HTML) 1 Page - Texas Instruments

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UDG-02091
OSC
PWM Latch
Fault Latch
(60%)
E / A
1.2 V
1 V
0.2 V
5 V
1.25 V
UVLO
T
Restart
Delay
Latch
Restart
Delay
4
5
6
7
3
2
1
8
9
15
10
16
12
14
11
13
CLK / LEB
RAMP
EAOUT
NI
INV
SS
Soft Start Complete
ILIM
GND
PGND
OUTB
OUTA
R
R
R
S
D
S
D
S
Current
Limit
Overcurrent
9.2 V / 8.4 V
PWM Comparator
Internal
Bias
4 V
5.1 VREF
VREF
5.1 V
On / Off
CT
RT
VCC
VC
VREF Good
9 A
250 A
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UC1825A-SP
SLUS873B – JANUARY 2009 – REVISED OCTOBER 2015
UC1825A-SP Rad-Tolerant Class-V, High-Speed PWM Controller
1 Features
3 Description
The UC1825A-SP PWM controller is an improved
1
QML-V Qualified, SMD 5962-87681
version of the standard UC1825 family. Performance
Rad-Tolerant: 30 kRad (Si) TID (1)
enhancements have been made to several of the
Compatible With Voltage-Mode or Current-Mode
circuit blocks. Error amplifier gain bandwidth product
Control Methods
is 12 MHz, while input offset voltage is 2 mV. Current
limit threshold is assured to a tolerance of 5%.
Practical Operation at Switching Frequencies
Oscillator discharge current is specified at 10 mA for
to 1 MHz
accurate dead time control. Frequency accuracy is
50-ns Propagation Delay to Output
improved to 6%. Start-up supply current, typically
High-Current Dual Totem Pole Outputs
100
μA, is ideal for offline applications. The output
(2-A Peak)
drivers are redesigned to actively sink current during
UVLO
at
no
expense
to
the
start-up
current
Trimmed Oscillator Discharge Current
specification. In addition each output is capable of
Low 100-
μA Start-Up Current
2-A peak currents during transitions.
Pulse-by-Pulse Current Limiting Comparator
Device Information(1)
Latched Overcurrent Comparator With Full Cycle
PART NUMBER
PACKAGE
BODY SIZE (NOM)
Restart
UC1825A-SP
CDIP (16)
19.56 mm × 6.92 mm
2 Applications
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
DC-DC Converters
Supports Various Topologies:
Push-Pull
Forward
Half-Bridge
Full-Bridge
(1)
Radiation tolerance is a typical value based upon initial device
qualification with dose rate = 10 mrad/sec. Radiation Lot
Acceptance Testing is available - contact factory for details.
Block Diagram
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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