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參數(shù)資料
| 型號(hào)： | AN-37 |
| 英文描述： | LinkSwitch-TN Design Guide |
| 中文描述： | 的LinkSwitch - TN設(shè)計(jì)指南 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 155K |
| 代理商： | AN-37 |
AN-37
6
A
1/04
Reference
Schematic
and Key
Table 6. LinkSwitch-TN Operation.
LinkSwitch-TN
Circuit Design
LinkSwitch-TN
Operation
The basic circuit configuration for a Buck converter using
LinkSwitch-TN
is shown in Figure 1a.
V
O
V
IN
PI-3784-121603
+
+
FB
BP
S
D
LinkSwitch-TN
= MOSFET
Enabled
= MOSFET
Disabled -
Cycle Skipped
Normal
Operation
Auto Restart
At beginning of each cycle the FEEDBACK
(FB) pin is sampled.
If I
FB
< 49
μ
A then next cycle occurs
If I
> 49
μ
A then next switching cycle
is skipped
High load – few cycles skipped
Low load – many cycles skipped
If no feedback (I
< 49
μ
A) for > 50 ms
then output switching is disabled for
approximately 800 ms.
To regulate the output, an ON/OFF control scheme is used as
illustrated in Table 6. As the decision to switch is made on a
cycle by cycle basis, the resultant power supply has extremely
good transient response and removes the need for control loop
compensation components. If no feedback is received for 50 ms
then the supply enters auto restart.
I
FB
< 49
μ
A, > 50 ms
= Auto Restart
Auto Restart = 50 ms ON / 800 ms OFF
50 ms
800 ms
PI-3768-121603
I
D
No
No
Yes
No
Is I
FB
>49
μ
A
No
Yes
Yes
No
PI-3767-121903
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