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TI-UC1901.pdf
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TI-UC1901.pdf
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UC1901
UC2901
UC3901
Isolated Feedback Generator
FEATURES
• An Amplitude-Modulation System for
Transformer Coupling an Isolated
Feedback Error Signal
• Low-Cost Alternative to Optical
Couplers
• Internal 1% Reference and Error
Amplifier
• Internal Carrier Oscillator Usable to
5MHz
• Modulator Synchronizable to an
External Clock
• Loop Status Monitor
DESCRIPTION
The UC1901 family is designed to solve many of the problems associ-
ated with closing a feedback control loop across a voltage isolation
boundary. As a stable and reliable alternative to an optical coupler, these
devices feature an amplitude modulation system which allows a loop er-
ror signal to be coupled with a small RF transformer or capacitor.
The programmable, high-frequency oscillator within the UC1901 series
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 switch-
ing frequency of a SMPS.
An additional feature is a status monitoring circuit which 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.
Since these devices can also be used as a DC driver for optical couplers,
the benefits of 4.5 to 40V supply operation, a 1% accurate reference, and a
high gain general purpose amplifier offer advantages even though an AC
system may not be desired.
µ µ
µ
UC1901 SIMPLIFIED SCHEMATICNovember S
SLUS279A - November 1998 - Revised January 2010
UDG-98080
2
UC1901
UC2901
UC3901
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . –10mA
Driver Output Currents . . . . . . . . . . . . . . . . . . . . . . . . . . –35mA
Status Indicator Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Status Indicator Current . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Ext. Clock Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Error Amplifier Inputs . . . . . . . . . . . . . . . . . . . . . –0.5V to +35V
Power Dissipation at TA = 25°C. . . . . . . . . . . . . . . . . . 1000mW
Power Dissipation at TC = 25°C . . . . . . . . . . . . . . . . . 2000mW
Operating Junction Temperature . . . . . . . . . . –55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 seconds) . . . . . . . . . . 300°C
Note 1: Voltages are referenced to ground, Pin 7. Currents are
positive into, negative out of the specified terminal.
Note 2: Consult Packaging section of Databook for thermal limi-
tations and considerations of package.
CONNECTION DIAGRAMS
DIL-14, SOIC-14 (TOP VIEW)
J or N Package, D Package
PLCC-20, LCC-20 (TOP VIEW)
Q, L Packages
SOIC-16 Wide (TOP VIEW)
DW Package
TEMPERATURE
RANGE
AVAILABLE
PACKAGES
UC1901 –55°C to +125°C J, L
UC2901 –40°C to +85°C D, DW, J, N, Q
UC3901 0°C to +70°C D, DW, J, N, Q
TEMPERATURE AND PACKAGE SELECTION
GUIDE
3
UC1901
UC2901
UC3901
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply for V
IN
= 10V, R
T
= 10kΩ, C
T
=
820pF, T
A
= T
J
.
PARAMETER TEST CONDITIONS UC1901/UC2901 UC3901 UNITS
MIN TYP MAX MIN TYP MAX
Reference Section
Output Voltage T
J
= 25°C 1.485 1.5 1.515 1.47 1.5 1.53 V
T
MIN
≤ T
J
≤ T
MAX
1.470 1.5 1.530 1.455 1.5 1.545
Line Regulation V
IN
= 4.5 to 35V 2 10 2 15 mV
Load Regulation I
OUT
= 0 to 5mA 4 10 4 15 mV
Short Circuit Current T
J
= 25°C –35 –55 –35 –55 mV
Error Amplifier Section (To Compensation Terminal)
Input Offset Voltage V
CM
= 1.5V 1 4 1 8 mV
Input Bias Current V
CM
= 1.5V –1 –3 –1 –6 µA
Input Offset Current V
CM
= 1.5V 0.1 1 0.1 2 µA
Small Signal Open Loop Gain 40 60 40 60 dB
CMRR V
CM
= 0.5 to 7.5V 60 80 60 80 dB
PSRR V
IN
= 5 to 25V 80 100 80 100 dB
Output Swing, ∆ V
O 0.4 0.7 0.4 0.7 V
Maximum Sink Current 90 150 90 150 µA
Maximum Source Current –2 –3 –2 –3 mA
Gain Band Width Product 1 1 MHz
Slew Rate 0.3 0.3 V/µS
Modulators/Drivers Section (From Compensation Terminal)
Voltage Gain 11 12 13 10 12 14 dB
Output Swing
±
1.6
±
2.8
±
1.6
±
2.8 V
Driver Sink Current 500 700 500 700 µA
Driver Source Current –15 –35 –15 –35 mA
Gain Band Width Product 25 25 MHz
Oscillator Section
Initial Accuracy T
J
= 25°C 140 150 160 130 150 170 kHz
T
MIN
≤ T
J
≤ T
MAX
130 170 120 180 kHz
Line Sensitivity V
IN
= 5 to 35V .15 .35 .15 .60 %/V
Maximum Frequency R
T
= 10k, C
T
= 10pF 5 5 MHz
Ext. Clock Low Threshold Pin 1 (C
T
) = V
IN
0.5 0.5 V
Ext. Clock High Threshold Pin 1 (C
T
) = V
IN
1.6 1.6 V
Status Indicator Section
Input Voltage Window @ E/A Inputs, V
CM
= 1.5V
±
135
±
150
±
165
±
130
±
150
±
170 mV
Saturation Voltage E/A ∆ Input = 0V, I
SINK
= 1.6mA 0.45 0.45 V
Max. Output Current Pin 13 = 3V, E/A ∆ Input = 0.0V 8 15 8 15 mA
Leakage Current Pin 13 = 40V, E/A ∆Input = 0.2V .05 1 .05 5 µA
Supply Current V
IN
= 35V 5 8 5 10 mA
UVLO Section
Drivers Enabled Threshold At Input Supply V
IN
3.9 4.5 3.9 4.5 V
Status Output Enabled
Threshold
At Input Supply V
IN
3.9 4.5 3.9 4.5 V
Change in Reference Output When V
IN
Reaches UVLO
Threshold
–2 –30 –2 –30 mV
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