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| 型号： | TPS56100PWPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.4 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | GREEN, PLASTIC, HTSSOP-28 |
| 文件页数： | 13/30页 |
| 文件大小： | 595K |
| 代理商： | TPS56100PWPR |
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TPS56100
HIGHEFFICIENCY DSP POWER SUPPLY CONTROLLER
FOR 5V INPUT SYSTEMS
SLVS201A JUNE 1999 REVISED JULY 1999
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
frequency calculation
A detailed derivation of frequency calculation is shown in the application report, Designing Fast Response
Synchronous Buck Regulators Using the TPS5210, TI Literature number SLVA044. When less accurate results
are acceptable, the simplified equation shown below can be used:
fs
V
O
V
I *
V
O
ESR
V
I
L
Hysteresis Window
control section
Below are the equations needed to select the various components within the control section. Component
reference numbers refer to the example application given at the end of this section. Details and the derivations
of the equations used in this section are available in the application report Designing Fast Response
Synchronous Buck Regulators Using the TPS5210, TI Literature number SLVA044.
output voltage selection
Of course the most important function of the power supply is to regulate the output voltage to a specific value.
Values between 1.3 V and 2.6 V can be easily set by shorting the correct VP inputs to ground. Values above
the maximum reference voltage (2.6 V) can be set by changing the reference voltage to any convenient voltage
within its range and selecting values for R2 and R3 to give the correct output. Select R3:
R3 << than VREF/IBIAS(VSENSE); a recommended value is 10 k
Then, calculate R2 using:
V
O +
V
REF
1
) R2
R3
or R2
+
R3
V
O *
V
REF
V
REF
R2 and R3 can also be used to make small adjusts to the output voltage within the reference-voltage range.
If there is no need to adjust the output voltage, R3 can be eliminated. R2, R3 (if used), and C7 are used as a
noise filter; calculate using:
C7
+
150 ns
R2
R3
Recommended values for 3.3 V: VREF = 1.65 V, R3 = 1.00 k, R2 = 1.00 k, and C7 = 100 pF.
slowstart timing
Slowstart reduces the start-up stresses on the power-stage components and reduces the input current surge.
Slowstart timing is a function of the reference-voltage current (determined by R5) and is independent of the
reference voltage. The first step in setting slowstart timing will be to determine R5:
R5 should be between 7 k
and 300 k, a recommended value is 20 k.
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