Other Parts Discussed in Thread: LM25141
LM25141带负载10mA, 输出关掉和启动缓慢的现象.
异常现象描述如下：
上电时输出电压缓慢上升到3.3V,持续时间超过10s，
当负载电流>=10m A时，输出电压瞬时跌落。
我测试了如下几个case
1，OSC拉低和拉5V
2，Current sense有启用和未启用（5mR 直接短路，CS和VOUT悬空）
3，VCCX拉低和连接Vout和5V
1. 电路如下：
2.测试数据如下：
|
LM25141 |
definition |
request |
test |
|
1 |
DEMB |
5 |
|
|
2 |
VDDA |
5 |
|
|
3 |
AGND |
0 |
|
|
4 |
RT |
1.25 |
|
|
5 |
DITH |
5 |
|
|
6 |
OSC |
0 |
|
|
7 |
LOL |
abnormal |
|
|
8 |
LO |
abnormal |
|
|
9 |
PGND |
0 |
|
|
10 |
VCC |
5 |
|
|
11 |
HB |
abnormal |
|
|
12 |
SW |
abnormal |
|
|
13 |
HO |
abnormal |
|
|
14 |
HOL |
abnormal |
|
|
15 |
VIN |
12 |
|
|
16 |
VCCX |
0 |
|
|
17 |
VOUT |
unused |
|
|
18 |
CS |
unused |
|
|
19 |
FB |
5 |
|
|
20 |
COMP |
||
|
21 |
PG |
0 |
|
|
22 |
SS |
0 |
|
|
23 |
EN |
3.3 |
|
|
24 |
RES |
3.异常波形如下：
4.仿真数据和波特图：
linfusai
15658680098
fusai.lin@thundersoft.com
