參數(shù)資料
型號： TPS56100PWPR
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(guān)電源控制器
文件頁數(shù)： 23/34頁
文件大?。?/td> 811K
代理商： TPS56100PWPR
TPS56302
DUAL-OUTPUT LOW-INPUT-VOLTAGE
DSP POWER SUPPLY CONTROLLER WITH SEQUENCING
SLVS289A
–
MARCH 2000
–
REVISED OCTOBER 2000
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 4. LDO Power Stage Components
LDO Section
Ref. Des
Part
VIN
VOUT
Description
Q2:A
IRF7811(EVM)
or
Si4410, IRF7413
FDS6680
IRF9410, Si9410
VIN
VIN
–
VDROPOUT
Used as a power distribution switch for
LDO output control
Q2:A
Low cost solution for low LDO output cur-
rent (V
IN
–
V
OUT
)*I
OUT
< 1 W
Higher current and still surface mount
1 W < (VIN
–
VOUT)*IOUT) < 2 W
High output current requiring heat sink.
Low cost but through
–
hole package.
(VIN
–
VOUT)*IOUT > 2 W
Q2:A
IRF7811
Q2: B
IRLZ24N
VDROPOUT = IOUT
×
RDSON. It should be as small as possible.
Position available on the EVM board
frequency calculation
With hysteretic control, the switching frequency is a function of the input voltage, the output voltage, the
hysteresis window, the delay of the hysteresis comparator and the driver, the output inductance, the resistance
in the output inductor, the output capacitance, the ESR and ESL in the output capacitor, the output current, and
the turnon resistance of high-side and low-side MOSFET. It is a very complex equation if everything is included.
To make it more useful to designers, a simplified equation is developed that considers only the most influential
factors. The tolerance of the result for this equation is about 30%:
fs
VOUT
VIN
VOUT
ESR
250
10
–
9
Td
Cout
VIN
VIN
ESR
250
10
–
9
Td
Vhys
LOUT
ESL
VIN
Where f
s
is the switching frequency (Hz); V
OUT
is the output voltage (V); V
IN
is the input voltage (V); C
OUT
is
the output capacitance; ESR is the equivalent series resistance in the output capacitor (
); ESL is the equivalent
series inductance in the output capacitor (H); L
OUT
is the output inductance (H); T
d
is output feedback RC filter
time constant (S); V
hys
is the hysteresis window (V).
output voltage setpoint calculation
In some applications, the required output voltage is different from the VID reference voltage. In this case,
external voltage divider can be used for the setpoint adjustment. The voltage divider is composed of two
resistors. The equation for the setpoint is:
Rbottom
Rtop
VO
VR
VR
Where V
R
is the reference voltage; V
O
is the required output voltage setpoint. V
R
should be lower than V
O
. In
EVM design, the top resistor is R14 for the LDO output, or R10 for ripple regular output; the bottom resistor is
R15 for LDO output, or R12 for ripple regulator output.
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