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UCC2806 Datasheet Preview

UCC2806 Datasheet

CURRENT-MODE PWM CONTROLLER

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UCC1806
UCC2806
UCC3806
SLUS272F -- FEBRUARY 2000 -- REVISED AUGUST 2006
LOW- POWER, DUAL-OUTPUT,
CURRENT-MODE PWM CONTROLLER
FEATURES
D BiCMOS Version of UC3846 Family
D 1.4-mA Maximum Operating Current
D 100-μA Maximum Startup Current
D ±0.5-A Peak Output Current
D 125-ns Circuit Delay
D Easier Parallelability
D Improved Benefits of Current Mode Control
DESCRIPTION
The UCC3806 family of BiCMOS PWM controllers
offers exceptionally improved performance with a
familiar architecture. With the same block diagram
and pinout of the popular UC3846 series, the
UCC3806 line features increased switching
frequency capability while greatly reducing the
bias current used within the device. With a typical
startup current of 50 μA and a well defined voltage
threshold for turn-on, these devices are favored
SIMPLIFIED APPLICATION DIAGRAM
for applications ranging from off-line power
supplies to battery operated portable equipment.
Dual high-current, MOSFET driving outputs and a
fast current sense loop further enhance device
versatility.
All the benefits of current mode control including
simpler loop closing, voltage feed-forward,
parallelability with current sharing, pulse-by-pulse
current limiting, and push/pull symmetry
correction are readily achievable with the
UCC3806 series.
These devices are available in multiple package
options for both through-hole and surface mount
applications; and in commercial, industrial, and
military temperature ranges.
The UCC1806 is specified for operation from
--55°C to 125°C, the UCC2806 is specified for
operation from --40°C to 85°C, and the UCC3806
is specified for operation from 0°C to 70°C.
+VIN
15 13
VIN VC
UCC3806
2 VREF
INV 6
8 CT
COMP 7
5 NI
AOUT 11
1 CURLIM BOUT 14
10 SYNC
9 RT
CS--
3
SHUT
DOWN
16
CS+ 4
GND
12
UC39431
+VOUT
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 1999 -- 2006, Texas Instruments Incorporated
1




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UCC2806 Datasheet Preview

UCC2806 Datasheet

CURRENT-MODE PWM CONTROLLER

No Preview Available !

UCC1806
UCC2806
UCC3806
SLUS272F -- FEBRUARY 2000 -- REVISED AUGUST 2006
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.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
UCx806
UNIT
Supply voltage, VIN
Supply current, IIN
Output supply voltage
VIN, low impedance
VIN, high impedance
VC
15 V
25 mA
18 V
Continuous source or sink
± 200
Output current
Gate drive
SYNC
± 500
± 30
mA
COMP
± 10 to --(self-limiting)
Analog input voltage range
CS--, CS+, NI, INV, SHUTDOWN
--0.3 to (VIN + 0.3)
V
Storage temperature, Tstg
--65 to 150
°C
Operating temperature, TJ
--55 to 150
°C
Lead temperature, Tsol, 1,6 mm (1/16 inch) from case for 10 seconds
300 °C
(1) 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. All voltages are with respect to
GND. Currents are positive into and negative out of, the specified terminal.
RECOMMENDED OPERATING CONDITIONS
Input voltage, VIN
Operating junction temperature, TJ
UCC1806
UCC2806
UCC3806
MIN
8.0
--55
--40
0
NOM
MAX
14.5
125
85
70
UNIT
V
°C
PACKAGE DESCRIPTION
D, DW, J, M, N OR PW PACKAGE
(TOP VIEW)
Q OR L PACKAGE
(TOP VIEW)
CURLIM
VREF
CS--
CS+
NI
INV
COMP
CT
1
2
3
4
5
6
7
8
16 SHUTDOWN
15 VIN
14 BOUT
13 VC
12 GND
11 AOUT
10 SYNC
9 RT
CS--
CS+
N/C
NI
INV
3 2 1 20 19
4 18
5 17
6 16
7 15
89
10 11
14
12 13
BOUT
VC
N/C
GND
AOUT
N/C -- No connection
2 www.ti.com


Part Number UCC2806
Description CURRENT-MODE PWM CONTROLLER
Maker etcTI
Total Page 30 Pages
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