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UC1845W883B датащи(PDF) 1 Page - Texas Instruments

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номер детали UC1845W883B
подробное описание детали  Current-Mode PWM Controllers
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UC1845W883B датащи(HTML) 1 Page - Texas Instruments

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VIN
UC2843
VCC
VREF
RT/CT
GROUND
COMP
VFB
ISENSE
OUTPUT
Copyright © 2016, Texas Instruments Incorporated
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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.
UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845
SLUS223D – APRIL 1997 – REVISED AUGUST 2016
UCx84x Current-Mode PWM Controllers
1 Features
1
1
Optimized for Off-Line and DC-to-DC Converters
Low Start-Up Current (< 1 mA)
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
Error Amplifier With Low Output Resistance
2 Applications
Switching Regulators of Any Polarity
Transformer-Coupled DC-DC Converters
3 Description
The UCx84x series of control integrated circuits
provide the features that are necessary to implement
off-line or DC-to-DC fixed-frequency current-mode
control schemes, with a minimum number of external
components. The internally implemented circuits
include an undervoltage lockout (UVLO), featuring a
start-up current of less than 1 mA, and a precision
reference trimmed for accuracy at the error amplifier
input. Other internal circuits include logic to ensure
latched operation, a pulse-width modulation (PWM)
comparator that also provides current-limit control,
and a totem-pole output stage that is designed to
source or sink high-peak current. The output stage,
suitable for driving N-channel MOSFETs, is low when
it is in the off state.
The UCx84x family offers a variety of package
options,
temperature
range
options,
choice
of
maximum duty cycle, and choice of turnon and turnoff
thresholds and hysteresis ranges. Devices with
higher turnon or turnoff hysteresis are ideal choices
for off-line power supplies, while the devices with a
narrower hysteresis range are suited for DC-DC
applications. The UC184x devices are specified for
operation from –55°C to 125°C, the UC284x series is
specified for operation from –40°C to 85°C, and the
UC384x series is specified for operation from 0°C to
70°C.
Device Information(1)
PART NUMBER
PACKAGE (PIN)
BODY SIZE (NOM)
UC184x
CDIP (8)
9.60 mm × 6.67 mm
LCCC (20)
8.89 mm × 8.89 mm
CFP (8)
9.21 mm × 5.97 mm
UC284x
SOIC (8)
4.90 mm × 3.91 mm
SOIC (14)
8.65 mm × 3.91 mm
PDIP (8)
9.81 mm × 6.35 mm
UC384x
SOIC (8)
4.90 mm × 3.91 mm
SOIC (14)
8.65 mm × 3.91 mm
PDIP (8)
9.81 mm × 6.35 mm
CFP (8)
9.21 mm × 5.97 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Application


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