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UC1842A-EP bảng dữ liệu(HTML) 1 Page - Texas Instruments

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V
CC
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50 mA
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UVLO
34 V
2.5 V
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UC1842A-SP, UC1843A-SP, UC1844A-SP
SLUS872D – JANUARY 2009 – REVISED MAY 2015
UC184xA-SP QML Class V, Current-Mode PWM Controller
1 Features
2 Applications
1
QML Class V (QMLV) Qualified, SMD 5962-86704
DC-DC Converters
Rad-Tolerant: 30 kRad (Si) TID (1) (2)
Supports Various Topologies:
Optimized for Offline and DC-to-DC Converters
Flyback, Forward, Buck, Boost
Low Start-Up Current (<0.5 mA)
Push-Pull, Half-Bridge, Full Bridge With
External Interface Circuit
Trimmed Oscillator Discharge Current
Available in Military Temperature Range (–55°C to
Automatic Feed Forward Compensation
125°C)
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
3 Description
Undervoltage Lockout (UVLO) With Hysteresis
The UC184xA family of control ICs is a pin-for-pin
Double-Pulse Suppression
compatible improved version of the UC184x family.
Providing the necessary features to control current-
High-Current Totem-Pole Output
mode switched-mode power supplies, this device has
Internally-Trimmed Bandgap Reference
the following improved features. Start up current is
500-kHz Operation
specified to be less than 0.5 mA. Oscillator discharge
is trimmed to 8.3 mA. During UVLO, the output stage
Low RO Error Amplifier
can sink at least 10 mA at less than 1.2 V for VCC
over 5 V.
The Device Comparison Table shows the difference
between members of this family. Reference the
individual product data sheets for ordering the
radiation-improved version if available.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
(1)
The LDR improved die is only available in the UC1843A-SP
UC1842A-SP
CDIP (8)
6.67 mm × 9.60 mm
(orderable as 5962-8670409VPA). Contact factory to request
UC1843A-SP
an LDR-improved version of the UC1842A-SP or UC1844A-
LCCC (20)
8.89 mm × 8.89 mm
UC1844A-SP
SP.
(2)
Radiation tolerance is a typical value based upon initial device
(1) For all available packages, see the orderable addendum at
qualification with dose rate = 10 mrad/s. Radiation lot
the end of the data sheet.
acceptance testing is available - contact factory for details.
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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