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| 型號： | TPS5211PWP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH FREQUENCY PROGRAMMABLE HYSTERETIC REGULATOR CONTROLLER |
| 中文描述： | 可編程滯高頻穩(wěn)壓控制器 |
| 文件頁數(shù)： | 22/32頁 |
| 文件大?。?/td> | 469K |
| 代理商： | TPS5211PWP |
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TPS5211
HIGH FREQUENCY PROGRAMMABLE HYSTERETIC
REGULATOR CONTROLLER
SLVS243 – SEPTEMBER 1999
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
hysteresis voltage
A hysteretic controller regulates by self-oscillation, thus requiring a small ripple voltage on the VSENSE pin
which the input comparator uses for sensing. Once selected, the TPS5211 hysteresis is proportional to the
reference voltage; programming Vref to a new value automatically adjusts the hysteresis to be the same
percentage of Vref. Since the output current from VREFB should be less than 500
μ
A, the total divider resistance
(R5 + R6) should be greater than 7 K
. The hysteresis voltage should be no greater than 60 mV so R6 will
dominate the divider.
R5
R6
VHSYT
VREFB
Hysteresis Window = 2
×
VR5
Figure 20. Hysteresis Divider Circuit
The upper divider resistor, R5, is calculated using:
(
)
( )
(
)
6
100
2
6
2
5
0
R
V
R
Window
Hysteresis
VREFB
Window
Hysteresis
–
R
HYST
×
×
×
×
=
Where Hysteresis Window = The desired peak-to-peak hysteresis voltage
VREFB = Selected reference voltage
V
HYST
(%) = [(Hysteresis Window)/VREFB] * 100 < V
O(Ripple)(P–P)
(%)
current limit
Current limit can be implemented using the on-resistance of the upper FETs as the sensing elements. Select
R8:
(
100
)
≤
×
≤
<<
nA
V
100
I
V
R
OCP
(
Bias
OCP
10 k
1
8
)
(A recommended value is 1 k
)
The IOUT signal is used to drive the current limit and droop-circuit dividers. The voltage at IOUT at the output
current trip point will be:
(
)
I
NumFETs
TF
R
V
Trip
(
O
ON
(
DS
Trip
(
IOUT
)
)
)
2
×
×
×
=
Where NumFETS = Number of upper FETS in parallel
TF = R
DS(ON)
temperature correction factor
I
O(Trip)
= Desired output current trip level (A)
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