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UC1856-SP датащи(PDF) 1 Page - Texas Instruments

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номер детали UC1856-SP
подробное описание детали  Improved Current-Mode PWM Controller
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UC1856-SP
SLUSBV6 – APRIL 2014
UC1856-SP Improved Current-Mode PWM Controller
1 Features
3 Description
The UC1856 is a high-performance version of the
1
Pin-for-Pin Compatible With the UC1846
popular UC1846 series of current-mode controllers,
65-ns Typical Delay From Shutdown to Outputs,
and is intended for both design upgrades and new
and 50-ns Typical Delay From SYNC to Outputs
applications
where
speed
and
accuracy
are
Improved Current-Sense Amplifier With Reduced
important.
All
input-to-output
delays
have
been
minimized, and the current sense output is slew-rate
Noise Sensitivity
limited to reduce noise sensitivity. Fast 1.5-A peak
Differential Current Sense with 3-V Common-
output stages have been added to allow rapid
Mode Range
switching of power FETs.
Trimmed-Oscillator Discharge Current for
A low-impedance TTL-compatible sync output has
Accurate Deadband Control
been implemented with a TRI-STATE function when
Accurate 1-V Shutdown Threshold
used as a sync input.
High-Current Dual Totem-Pole Outputs (1.5-A
Internal-chip
grounding
has
been
improved
to
peak)
minimize internal noise caused when driving large
TTL Compatible Oscillator SYNC Pin Thresholds
capacitive loads. This improvement, in conjunction
4-kV ESD Protection
with the improved differential current-sense amplifier,
results in enhanced noise immunity.
2 Applications
Other features include a trimmed oscillator current
(8%) for accurate frequency and dead-time control; a
DC-DC Converters
1-V 5% shutdown threshold; and 4-kV minimum
Supports Various Topologies:
electrostatic discharge (ESD) protection on all pins.
Push-Pull, Forward, Half-Bridge, Full Bridge
Available in Military Temperature range (-55°C to
Device Information(1)
125°C)
DEVICE NAME
PACKAGE
BODY SIZE
CDIP (16)
20.57 mm x 7.37 mm
UC1856-SP
CFP (16)
10.16 mm x 7.1 mm
(1)
For all available packages, see the orderable addendum at
the end of the datasheet.
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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