UCC2810
UCC3810
www.ti.com
SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007
DUAL CHANNEL SYNCHRONIZED CURRENT-MODE PWM
FEATURES
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DESCRIPTION
Single Oscillator Synchronizes Two PWMs
150-µA Startup Supply Current
2-mA Operating Supply Current
Operation to 1 MHz
Internal Soft-Start
Full-Cycle Fault Restart
Internal Leading-Edge Blanking of the Current
Sense Signal
1-A Totem Pole Outputs
75-ns Typical Response from Current Sense
to Output
1.5% Tolerance Voltage Reference
N PACKAGE
(TOP VIEW)
SYNC
CT
RT
FB1
COMP1
CS1
OUT1
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
REF
ENABLE2
FB2
COMP2
CS2
OUT2
PWRGND
The UCC3810 is a high-speed BiCMOS controller
integrating two synchronized pulse width modulators
for use in off-line and dc-to-dc power supplies. The
UCC3810 family provides perfect synchronization
between two PWMs by usin g the same oscillator.
The oscillator’s sawtooth waveform can be used for
slope compensation if required.
Using a toggle flip-flop to alternate between
modulators, the UCC3810 ensures that one PWM
does not slave, interfere, or otherwise affect the
other PWM. This toggle flip- flop also ensures that
each PWM is limited to 50% maximum duty cycle,
insuring adequate off-time to reset magnetic
elements. This device contains many of the same
elements of the UC3842 current mode controller
family, combined with the enhancements of the
UCC3802. This minimizes power supply parts count.
Enhancements include leading edge blanking of the
current sense signals, full cycle fault restart, CMOS
output drivers, and outputs which remain low even
when the supply voltage is removed.
PW PACKAGE
(TOP VIEW)
SYNC
CT
RT
FB1
COMP1
CS1
OUT1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
REF
ENABLE2
FB2
COMP2
CS2
OUT2
PWRGND
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2007, Texas Instruments Incorporated
UCC2810
UCC3810
www.ti.com
SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
PACKAGED DEVICES (1)
TJ
(1)
SOP (DW)
PDIP (N)
–40°C to 85°C
UCC2810DW (16)
UCC2810N (16)
0°C to 70°C
UCC3810DW (16)
UCC3810N (16)
All packages are available taped and reeled (indicated by the R suffix on the device type e.g.,
UCC2810JR)
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted) (1) (2)
UNIT
voltage (3)
VCC
Supply
ICC
Supply current
11V
20mA
Output peak current, OUT1, OUT2, 5% duty cycle
±1A
Output energy, OUT1, OUT2, capacitive load 20 µJ
20µJ
Analog inputs, FB1, FB2, CS1, CS2, SYNC
TJ
Operating junction temperature
Tstg
Storage temperature range
–0.3 to 6.3V
150°C
–65 to 150°C
Lead temperature (soldering, 10 sec)
(1)
(2)
(3)
300°C
Currents are positive into, negative out of the specified terminal. All voltages are with respect to GND.
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
In normal operation, VCC is powered through a current-limiting resistor. Absolute maximum of 11 V applies when driven from a low
impedance such that the VCC current does not exceed 20 mA.
BLOCK DIAGRAM
REF
FB1
COMP1
CS1
CS2
VCC
15
15
5
6
11
16
Leading
Edge
Blanking
Leading
Edge
Blanking
Over-Current
Comparator
1.5 V
VCC OK
12.5 V
2.5 V
VCC
S Q
Error
Amp 1
55 kW
Voltage
Ref
REF OK
S Q
100 kW
7
OUT1
10
OUT2
R
1V
R
4V
0.5 V
S Q
R
Error
Amp 2
2.5 V
Full Cycle
Soft Start
+
−
S Q
R
R
55 kW
τ − 5ms
100 kW
35 mA
2
1V
Oscillator
13
12
1
2
3
14
9
8
FB2
COMP2
SYNC
CT
RT
ENABLES
PWRGND
GND
VDG−92062−1
2
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UCC2810
UCC3810
www.ti.com
SLUS162D – FEBRUARY 1999 – REVISED FEBRUARY 2007
ELECTRICAL CHARACTERISTICS
All parameters are the same for both channels, –40°C ≤ TA ≤ 85°C for the UCC2810, 0°C ≤ TA ≤ 70°C for the UCC3810,
VCC = 10 V (1) ; RT = 150 kΩ, CT = 120 pF; no load; TA = TJ; (unless otherwise specified)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
4.925
5.000
5.075
4.85
5.00
5.10
5
30
UNIT
REFERENCE
VCC
TJ = 25°C
Output voltage
IO(SC)
TJ = full range, 0 mA ≤ IREF ≤ 5 mA
Load regulation
0 mA ≤ IREF ≤ 5 mA
Line regulation
UVLO stop threshold voltage,
0.5 V ≤ VCC ≤ VSHUNT
Output noise voltage (2)
10Hz
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