參數(shù)資料
型號: UCC3941-ADJJ
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: SWITCHING REGULATOR, CDIP8
封裝: DIP-8
文件頁數(shù): 5/10頁
文件大小: 179K
代理商: UCC3941-ADJJ
4
UCC2941-3/-5/-ADJ
UCC3941-3/-5/-ADJ
4
5
2
3
8
1
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
SD
50mV
MAXIMUM
200kHz
STARTUP
OSCILATOR
AND CONTROL
VGD
VGD ZERO
DETECT
VOUT ZERO
DETECT
ANTI-RINGING
SWITCH
1.7
S
OFF TIME
CONTROLLER
RECTIFIER
CONTROL
FROM SD
CLK
DQ
L1
RQ
SD
BOOST
LATCH
ON TIME
CONTROLLER
T
ON=
11
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
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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