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參數(shù)資料
| 型號(hào)： | UCC2945 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 1V Synchronous Boost Converter |
| 中文描述： | 1V的同步升壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 4/11頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | UCC2945 |
4
UCC2941-3/-5/-ADJ
UCC3941-3/-5/-ADJ
4
5
2
3
8
1
6
6
7
SD
PLIM
VGD
VIN
SW
VOUT
FB FOR
UCC3941-ADJ
ONLY
PGND
SGND FOR
UCC3941-3/-5
5
+
–
+
–
+
–
VGD
+
–
+
–
+
–
+
–
* 3.3V FOR UCC3941-3
5.0V FOR UCC3941-5
1.25V FOR UCC3941-ADJ
VGD
** 8.7V FOR UCC3941-3
9.6V FOR UCC3941-5/-ADJ
VGD
*** 7.7V FOR UCC3941-3
8.8V FOR UCC3941-5/-ADJ
FROM
SD
5V
1.4A
MAX
CURRENT
LIMIT
50mV
VIN
VIN
SD
50mV
MAXIMUM
200kHz
STARTUP
OSCILATOR
AND CONTROL
VGD
VGD
VGD ZERO
DETECT
VOUT ZERO
DETECT
ANTI-RINGING
SWITCH
1.7
μ
S
OFF TIME
CONTROLLER
RECTIFIER
CONTROL
FROM SD
CLK
D
Q
L1
R
Q
SD
BOOST
LATCH
ON TIME
CONTROLLER
T
ON
=11
μ
SEC
VIN
VSAT
*
**
***
THERMAL
SHUTDOWN
R
Q
SD
Figure 1. 1V Synchronous boost.
UDG-98146
Note: Switches are shown in the logic low state.
A detailed block diagram of the UCC3941 is shown in
Fig. 1. Unique control circuitry provides high efficiency
power conversion for both light and heavy loads by tran-
sitioning between discontinuous and continuous conduc-
tion based on load conditions. Fig. 2 depicts converter
waveforms for the application circuit shown in Fig. 3. A
single 22
μ
H inductor provides the energy pulses required
for a highly efficient 3.3V converter at up to 500mW out-
put power.
APPLICATION INFORMATION
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