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| 型号： | TPS5102IDBTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO30 |
| 封装： | GREEN, PLASTIC, TSSOP-30 |
| 文件页数： | 7/34页 |
| 文件大小： | 1182K |
| 代理商： | TPS5102IDBTG4 |
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TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER
SLVS239 - SEPTEMBER 1999
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output voltage setpoint calculation (continued)
If a higher precision resistor is used, the voltage setup can be more accurate.
In some applications, the output voltage is required to be lower than the reference voltage. With a few extra
components, the lower voltage can be easily achieved. The drawing below shows the method.
TPS5102
VCC
VO
R(top)
R(bottom)
Rz1
Zener
INV
Rz2
In the schematic, the Rz1, the 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 the 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:
Rbtm
Vr
Rtop
)
Vo
Vr
(
)
Vr
Vz
(
2
Rz
+
–
=
When Rz2 is the adjusting resistor for low output voltage; Vz is the zener voltage; Vr is the internal reference
voltage; Rtop is the resistor of the voltage sensing network; Rbtm is the bottom resistor of the sensing
network;VO is the required output voltage setpoint.
Example: Assuming the required output voltage setpoint is VO = 0.8 V, VZ = 5 V; Rtop = 1 k; Rbottom = 1 k,
Then the Rz2 = 2.43 k
.
output inductor ripple current
The output inductor current ripple can affect not only the efficiency, but also the output voltage ripple. The
equation is exhibited below:
Iripple
+
Vin
* Vout * Iout
(
Rdson
) R
L)
Lout
D
Ts
Where
Iripple is the peak-to-peak ripple current (A) through the inductor; Vin is the input voltage (V); Vout is the
output voltage (V);
Iout is the output current; Rdson is the on-time resistance of MOSFET (
); D is the duty cycle;
and
Ts is the switching cycle (S). From the equation, it can be seen that the current ripple can be adjusted by
changing the output inductor value.
Example: Vin = 5 V; Vout = 1.8 V; Iout = 5 A; Rdson = 10 m
; RL = 5 m; D = 0.36; Ts = 10 S; Lout = 6 H
Then, the ripple Iripple = 2 A.
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