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UCC1806 Datasheet(PDF) 1 Page - Texas Instruments

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Part No. UCC1806
Description  Low Power, Dual Output, Current Mode PWM Controller
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC1806 Datasheet(HTML) 1 Page - Texas Instruments

   
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UCC1806
UCC2806
UCC3806
Low Power, Dual Output, Current Mode PWM Controller
FEATURES
• BiCMOS Version of UC1846 Families
• 1.4mA Maximum Operating Current
• 100µA Maximum Startup Current
• 1.0A Peak Output Current
• 125nsec Circuit Delay
• Easier Parallelability
• Improved Benefits of Current Mode
Control
DESCRIPTION
The UCC1806 family of BiCMOS PWM controllers offers exceptionally im-
proved performance with a familiar architecture. With the same block dia-
gram and pinout of the popular UC1846 series, the UCC1806 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 for ap-
plications ranging from off-line power supplies to battery operated portable
equipment. Dual high current, FET driving outputs and a fast current sense
loop further enhance device versatility.
All the benefits of current mode control including simpler loop closing, volt-
age feed-forward, parallelability with current sharing, pulse-by-pulse current
limiting, and push-pull symmetry correction are readily achievable with the
UCC1806 series.
(continued)
10
7
3
8
SYNC
9
RT
4.4V
1.5V
OSC
LO
CT
3X
4
5
EA
6
120
µA
1
S
1
QB
R
S
2
13
VC
11
AOUT
14
BOUT
12
GND
T
Q
QB
SHUTDOWN
LOCK OUT
S
1
Q
R
S
2
200
µA
Q
R
S
16
200k
1.00V
0.35V
Q
R
S
CURRENT LIMIT
RESTART
UNDER VOLTAGE LOCKOUT
15
15V
5.1V
REFERENCE
REGULATOR
REFERENCE LOW
4.25V
2
CURLIM
SHUTDOWN
VREF
0.5V
+
COMP
7.0V
7.5V
CS–
CS+
NI
INV
COMP
VIN
BLOCK DIAGRAM
SLUS272A - FEBRUARY 2000
UDG-99035
application
INFO
available
Pin numbers refer to DIL-16 package.


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