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UCC1806DWTR Datasheet

  • UCC1806DWTR

  • Analog IC

  • 147.92KB

  • 7頁(yè)

  • ETC

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INFO
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UCC1806
UCC2806
UCC3806
Low Power, Dual Output, Current Mode PWM Controller
FEATURES
鈥?/div>
BiCMOS Version of UC1846 Families
鈥?/div>
1.4mA Maximum Operating Current
鈥?/div>
100碌A(chǔ) Maximum Startup Current
鈥?/div>
1.0A Peak Output Current
鈥?/div>
125nsec Circuit Delay
鈥?/div>
Easier Parallelability
鈥?/div>
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碌A(chǔ) 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)
BLOCK DIAGRAM
SYNC
10
4.4V
1.5V
13
VC
RT
9
11
AOUT
OSC
CT
8
Q
LO
R
CS鈥?/div>
3
3X
COMP
0.5V
120碌A(chǔ)
S
1
S
2
QB
T
QB
12
SHUTDOWN
LOCK OUT
GND
14
BOUT
CS+
4
鈥?/div>
+
NI
5
EA
S
1
R
Q
7.0V
S
2
S
Q
R
7.5V
15V
5.1V
REFERENCE
REGULATOR
4.25V
REFERENCE LOW
2
VREF
R
200碌A(chǔ)
CURRENT LIMIT
RESTART
UNDER VOLTAGE LOCKOUT
Q
S
1.00V
16
200k
SHUTDOWN
0.35V
1
CURLIM
INV
COMP
6
7
VIN
15
Pin numbers refer to DIL-16 package.
UDG-99035
SLUS272A - FEBRUARY 2000
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