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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 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 190K |
| 代理商： | UCC2945 |
5
UCC2941-3/-5/-ADJ
UCC3941-3/-5/-ADJ
Figure 2. Inductor current and output ripple waveforms.
APPLICATION INFORMATION (cont.)
UDG-96117
At time
t
1
, the 3.3V output drops below its lower thresh-
old, and the inductor is charged with an on time deter-
mined by:
s
VIN
T
ON
=
12
μ
For a 1.25V input, and a 22
μ
H inductor, the resulting
peak current is approximately 500mA. At time
t
2
, the in-
ductor begins to discharge with a minimum off time of
1.7
μ
s. Under lightly loaded conditions, the amount of en-
ergy delivered in this single pulse would satisfy the volt-
age control loop, and the converter would not command
any more energy pulses until the output again drops be-
low the lower voltage threshold.
At time
3
, the VGD supply has dropped below its lower
threshold, but the output voltage is still above its thresh-
old point. This results in an energy pulse to the gate drive
supply at
t
4
. However, while the gate drive is being serv-
iced, the output voltage has dropped below its lower
threshold, so the state machine commands an energy
pulse to the output as soon as the gate drive pulse is
completed.
Time
t
6
, represents a transition between light and heavy
load. A single energy pulse is not sufficient to force the
output voltage above its upper threshold before the mini-
mum off time has expired, and a second charge cycle is
commanded. Since the inductor current does not reach
zero in this case, the peak current is greater than 0.5A at
the end of the next charge on time. The result is a
ratcheting of inductor current until either the output volt-
age is satisfied, or the converter reaches its programmed
current limit. At time
t
7
, the gate drive voltage has
dropped below its threshold but the converter continues
to service the output because it has highest priority, un-
less VGD drops below 7.5V.
Between
t
7
and
t
8
, the converter reaches its peak current
limit which is determined by R
PL
and VIN. Once the limit
is reached, the converter operates in continuous mode
with approximately 200mA of ripple current. At time
t
8
,
the output voltage is satisfied, and the converter can ser-
vice VGD, which occurs at
t
9
.
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