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UC3844ADTRG4 数据表(PDF) 1 Page - Texas Instruments

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部件名 UC3844ADTRG4
功能描述  Current-Mode PWM Controller
Download  45 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

UC3844ADTRG4 数据表(HTML) 1 Page - Texas Instruments

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VIN
UC2843A
VCC
VREF
RT/CT
GND
COMP
FB
ISENSE
OUTPUT
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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.
UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A
SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016
UCx84xA Current-Mode PWM Controller
1
1 Features
1
Optimized for Off-Line and DC-DC Converters
Low Start-Up Current (< 0.5 mA)
Trimmed Oscillator Discharge Current
Automatic Feedforward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Undervoltage Lockout With Hysteresis
Double Pulse Suppression
High-Current Totem Pole Output
Internally-Trimmed Bandgap Reference
Up to 500-kHz Operation
2 Applications
Switch Mode Power Supplies (SMPS)
DC-DC Converters
Power Modules
Industrial PSU
Battery Operated PSU
3 Description
The UCx84xA family of control ICs is a pin-for-pin
compatible improved version of the UCx84x family.
Providing the necessary features to control current-
mode or switched-mode power supplies, this family of
devices has many improved features: startup current
is less than 0.5 mA, oscillator discharge is trimmed to
8.3 mA, and during UVLO, the output stage can sink
at least 10 mA at less than 1.2 V for VCC over 5 V.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UC1842A, UC1843A,
UC1844A, UC1845A
CDIP (8)
6.67 mm × 9.60 mm
LCCC (20)
8.89 mm × 8.89 mm
UC2843A
PLCC (20)
8.96 mm × 8.96 mm
UC2842A, UC2843A,
UC2844A, UC2845A,
UC3842A, UC3843A,
UC3844A, UC3845A
PDIP (8)
6.35 mm × 9.81 mm
SOIC (8)
3.91 mm × 4.90 mm
SOIC (14)
3.91 mm × 8.65 mm
SOIC (16)
7.50 mm × 10.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram


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