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參數資料
| 型號： | TPS5210PWPR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Voltage-Mode SMPS Controller |
| 中文描述： | 電壓模式開關電源控制器 |
| 文件頁數： | 24/29頁 |
| 文件大小： | 500K |
| 代理商： | TPS5210PWPR |
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TPS5210
PROGRAMMABLE SYNCHRONOUS BUCK REGULATOR CONTROLLER
SLVS171A – SEPTEMBER 1998 – REVISED MAY 1999
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
droop compensation (continued)
Then, calculate R9:
R9
V
IOUT(Max)
V
DROOP
1
R10
Where V
DROOP
= Desired droop voltage
At full load, the output voltage will be:
V
O
V
REF
1
R2
R3
V
DROOP
using the TPS5210 when both 12 V and 5 V are available
When both 12 V and 5 V are available, several components can be removed from the basic schematic shown
above. R1, R4, and C9 are no longer required if 5 V is brought in directly to INHIBIT and LODRV. However, if
undervoltage lockout for the 5-V input is desired, R1 and R4 can be used to set the startup setpoint. The INHIBIT
pin trip level is 2.1 V. Select R4:
(
100
)
≤
×
≤
<<
k
nA
V
100
I
V
R
Max
INH
INH
210
1
4
)
(
Then, set the 5-V UVLO trip level with R1:
(
2
V
)
4
2
5
1
R
V
V
R
Trip
×
–
=
R1
R4
INHIBIT
LODRV
Figure 21. 5-V Input with UVLO
using the TPS5210 when only 5 V is available
The TPS5210 controller requires 12 V for internal control of the device. If an external source for 12 V is not
available, a small on-board source must be included in the design. Total 12-V current is very small, typically
about 20 mA, so even a small charge pump can be used to generate the supply voltage. The power stage is
not voltage dependent, but component values must be selected for 5-V inputs and the frequency of operation
is dependent upon the power stage input voltage.
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