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參數(shù)資料
| 型號： | LM2645MTDX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 335 kHz SWITCHING FREQ-MAX, PDSO48 |
| 封裝： | TSSOP-48 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 497K |
| 代理商： | LM2645MTDX/NOPB |
TABLE 1. Shut Down Latch Truth Table
Input
Output
ovp1
ovp2
uvp1
uvp2
uvp4
oc3
ch1 on
ch2 on
fault
ssto1
ssto2
uv_delay
latch off
11
0
1
11
0
1
0
1
cap
1
0
1
cap
1
0
1
cap
1
000001
000
cap
0
All other combinations
0
Notes:
1.
’fault’ is the logic OR of UVLO and thermal shutdown.
2.
’cap’ means the pin has a capacitor of appropriate value between it and ground.
3.
Positive logic is used.
4.
ssto1, ssto2 means soft start timeout for Ch 1 and Ch 2 respectively.
5.
A blank value means ’don’t care’.
6.
″oc3″ means OUT3 output current over 100mA current.
7.
″uvp4″ means UVP of the linear regulated output controlled by LDODRV.
8.
SD pin is pulled high.
TABLE 2. Power Good Truth Table
Input
Output
ovp1
ovp2
uvpg1
uvpg2
uvpg4
ch1 on
ch2 on
fault
latch
off
SD
PGOOD1
PGOOD2
1
100
1
100
11
1
0
11
1
0
001
10
0
1
01
0
01
0
00
10
0
1
0
100
1
100
1
100
000
Notes:
1.
Positive logic is used.
2.
A blank value means ’don’t care’.
3.
The symbol uvpg1, 2, 4 means the power good undervoltage threshold of the corresponding channel.
LM2645
www.national.com
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