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TI-UC2901-EP.pdf
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TI-UC2901-EP.pdf
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RT
VREF
NI
INV
COMP
STATUS
+VIN
CT
EXTCLK
N/C
DRIVERB
DRIVERA
GND
N/C
DPACKAGE
(TOP VIEW)
N/C = No internal connection
UC2901-EP
www.ti.com
SLUS709A –DECEMBER 2006–REVISED MARCH 2010
ISOLATED FEEDBACK GENERATOR
Check for Samples: UC2901-EP
1
FEATURES
• Controlled Baseline • Internal Carrier Oscillator Usable to 5 MHz
– One Assembly/Test Site, One Fabrication • Modulator Synchronizable to an External
Site Clock
• Extended Temperature Performance of –55°C • Loop Status Monitor
to 125°C
• Enhanced Diminishing Manufacturing Sources
(DMS) Support
• Enhanced Product-Change Notification
• Qualification Pedigree
(1)
• Amplitude-Modulation System for Transformer
Coupling an Isolated Feedback Error Signal
• Low-Cost Alternative to Optical Couplers
• Internal 1% Reference and Error Amplifier
(1) Component qualification in accordance with JEDEC and
industry standards to ensure reliable operation over an
extended temperature range. This includes, but is not limited
to, Highly Accelerated Stress Test (HAST) or biased 85/85,
temperature cycle, autoclave or unbiased HAST,
electromigration, bond intermetallic life, and mold compound
life. Such qualification testing should not be viewed as
XXX
justifying use of this component beyond specified
performance and environmental limits.
DESCRIPTION
The UC2901 is designed to solve many of the problems associated with closing a feedback control loop across a
voltage isolation boundary. As a stable and reliable alternative to an optical coupler, UC2901 features an
amplitude modulation system that allows a loop error signal to be coupled with a small RF transformer or
capacitor.
The programmable, high-frequency oscillator within the UC2901 permits the use of smaller, less-expensive
transformers, which can readily be built to meet the isolation requirements of today's line-operated power
systems. As an alternative to RF operation, the external clock input to these devices allows synchronization to a
system clock or to the switching frequency of an SMPS.
An additional feature is a status monitoring circuit that provides an active low output when the sensed error
voltage is within ±10% of the reference. The DRIVERA output, DRIVERB output, and STATUS output are
disabled until the input supply has reached a sufficient level to allow proper operation of the device.
Because these devices also can be used as a DC driver for optical couplers, the benefits of 4.5 V to 40 V supply
operation, a 1% accurate reference, and a high-gain general-purpose amplifier offer advantages, even though an
AC system may not be desired.
ORDERING INFORMATION
T
A
PACKAGE
(1)
ORDERABLE PART NUMBER TOP-SIDE MARKING
–55°C to 125°C D (SOIC) UC2901MDREP UC2901MEP
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2010, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
STATUS
DRIVERB
DRIVERA
700 Am
4K
V
IN
MODULATOR
4K
700 Am
V
IN
CT
EXTCLK
RT
OSCILLATOR
3K
5K
10K
BIAS
BIAS
BIAS
X2
X1
1K
150mV
150mV
STATUS
AMPLIFIERS
ERROR
AMPLIFIER
V
IN
V
IN
2K
V
IN
150 Am
1.25V
2.5K
500
1.5-VOLTREFERENCE
GND
VREF
COMP
INV
NI
UC2901-EP
SLUS709A –DECEMBER 2006–REVISED MARCH 2010
www.ti.com
UC2901 SIMPLIFIED SCHEMATIC
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
V
IN
Input supply voltage 40 V
Reference output current –10 mA
Driver output current –35 mA
Status indicator voltage 40 V
Status indicator current 20 mA
External clock input 40 V
Error amplifier inputs –0.5 35 V
Power dissipation at T
A
= 25°C 1000 mW
Operating junction temperature range –55 150 °C
Storage temperature range
(2)
–65 150 °C
Lead temperature (soldering, 10 seconds) 300 °C
(1) Voltages are referenced to ground, pin 7. Currents are positive into, and negative out of the specified terminal.
(2) Long-term high-temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction of
overall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.
2 Submit Documentation Feedback Copyright © 2006–2010, Texas Instruments Incorporated
Product Folder Link(s): UC2901-EP
UC2901-EP
www.ti.com
SLUS709A –DECEMBER 2006–REVISED MARCH 2010
DISSIPATION RATING TABLE - FREE-AIR TEMPERATURE
PACKAGE AIR FLOW T
A
≤25°C POWER DERATING FACTOR T
A
= 70°C POWER T
A
= 85°C POWER T
A
=125°C POWER
(CFM) RATING ABOVE T
A
= 25°C RATING RATING RATING
D 0 1000 mW 8 mW/°C 630 mW 510 mW 180 mW
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Reference Section
T
A
= 25°C 1.485 1.5 1.515
Output voltage V
T
MIN
≤ T
A
≤ T
MAX
1.470 1.5 1.530
Line regulation V
IN
= 4.5 to 35 V 2 10 mV
Load regulation I
OUT
= 0 to 5 mA 4 10 mV
Short-circuit current T
A
= 25°C –35 –55 mA
Error Amplifier Section (To Compensation Terminal)
Input offset voltage V
CM
= 1.5 V 1 4 mV
Input bias current V
CM
= 1.5 V –1 –3 mA
Input offset current V
CM
= 1.5 V 0.1 1 mA
Small-signal open-loop gain 40 60 dB
CMRR V
CM
= 0.5 V to 7.5 V 60 80 dB
PSRR V
IN
= 5 V to 25 V 80 100 dB
Output swing, ΔV
O
0.4 0.7 V
Maximum sink current 90 150 mA
Maximum source current –2 –3 mA
Gain bandwidth product 1 MHz
Slew rate 0.3 V/ms
Modulators/Drivers Section (From Compensation Terminal)
Voltage gain 11 12 13 dB
Output swing ±1.6 ±2.8 V
Driver sink current 500 700 mA
Driver source current –15 –35 mA
Gain bandwidth product 25 MHz
Oscillator Section
T
A
= 25°C 140 150 160 kHz
Initial accuracy
T
MIN
≤ T
A
≤ T
MAX
130 170 kHz
Line sensitivity V
IN
= 5 V to 35 V 0.15 0.35 %/V
Maximum frequency R
T
= 10 K, C
T
= 10 pF 5 MHz
External clock low threshold Pin 1 (C
T
) = V
IN
0.5 V
External clock high threshold Pin 1 (C
T
) = V
IN
1.6 V
Status Indicator Section
Input voltage window At E/A inputs, V
CM
= 1.5 V ±135 ±150 ±165 mV
Saturation voltage E/A Δinput = 0 V, I
SINK
= 1.6 mA 0.45 V
Maximum output current Pin 13 = 3 V, E/A Δ input = 0 V 8 15 mA
Leakage current Pin 13 = 40 V, E/A Δ input = 0.2 V 0.05 1 mA
Supply current V
IN
= 35 V 5 8 mA
UVLO Section
Drivers-enabled threshold At input supply V
IN
3.9 4.5 V
Status output-enabled threshold At input supply V
IN
3.9 4.5 V
Change in reference output When VIN reaches UVLO threshold –2 –30 mV
Copyright © 2006–2010, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): UC2901-EP
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