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| 型号： | TPS5103IDBG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, SSOP-20 |
| 文件页数： | 14/40页 |
| 文件大小： | 1225K |
| 代理商： | TPS5103IDBG4 |
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Rz2 +
V
(z)
–V
ref
V
ref
–V
O
R1
)
V
ref
R2
TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output voltage setpoint calculation
The output voltage is set by the reference voltage and the voltage divider. In the TPS5102, the reference voltage
is 1.185 V, and the divider is composed of two resistors in the EVM design that are R4 and R5, or R14 and R15.
The equation for the setpoint is shown below.
R2
+
R1
V
ref
V
O *
V
ref
Where R1 (
> 10 k) is the top resistor R2 is the bottom resistor (k), VO is the required output voltage, and Vref
is the reference voltage (1.185 V in TPS5103).
Example: R1 = 1 k
; Vref = 1.185 V; VO = 1.8 V, then R2 = 1.9 k.
Some of the most popular output voltage setpoints are calculated in Table 2.
Table 2. Output Voltage Setpoints
VO
1.3 V
1.5 V
1.8 V
2.5 V
3.3 V
5.0 V
R1 (k
)
10
R2 (k
)
100
37
19
9
5.6
3.1
If higher precision resistor is used, the output voltage setpoint can be more accurate.
In some applications, the output voltage is required to be lower than the reference voltage. With a few extra
components, this lower voltage can be easily achieved. Figure 40 shows the method for accomplishing this.
TPS5103
VCC
VO
R1
R2
Rz1
Zener
INV
Rz2
Figure 40. Application With Extra Components for Lower Output Voltage
In the schematic, Rz1, Rz2, and the Zener are the extra components. Rz1 is used to give the Zener enough
current to build up the Zener voltage. The Zener voltage is added to INV through Rz2. Therefore, the voltage
on INV is still equal to the IC internal voltage (1.185 V), even if the output voltage is regulated at a lower setpoint.
The equation for setting up the output voltage is shown below:
Where Rz2 is the adjusting resistor for low-output voltage, V(z) is the Zener voltage, Vref is the internal reference
voltage, R1 is the top resistor of the voltage sensing network, R2 is the bottom resistor of the sensing network,
and VO is the required output voltage setpoint.
Example: Assuming the required output voltage setpoint is VO = 0.8 V, V(z) = 5 V, R1 = 1 k; R2 = 1 k, then
the Rz2 = 2.43 k.
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