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參數資料
| 型號： | TPS62361BYZHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 4.3 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, BGA16 |
| 封裝： | 2 X 2 MM, GREEN, DSBGA-16 |
| 文件頁數： | 25/52頁 |
| 文件大小： | 1125K |
| 代理商： | TPS62361BYZHT |
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OUT
IN
L
OUT
V
1
V
I
= V
L
-
L
L,MAX
OUT,MAX
I
= I
+
2
SLVSAU9A
– MAY 2011 – REVISED AUGUST 2011
Table 7. List of Recommended Capacitors
CAPACITANCE
DIMENSIONS
TYPE
MANUFACTURER
[
F]
L x W x H [mm3]
10
GRM188R60J106M
0603: 1.6 x 0.8 x 0.8
Murata
10
CL10A106MQ8NRNC
0603: 1.6 x 0.8 x 0.8
Samsung
22
GRM188R60G226M
0603: 1.6 x 0.8 x 0.8
Murata
22
CL10A106MQ8NRNC
0603: 1.6 x 0.8 x 0.8
Samsung
DECOUPLING CAPACITORS AT AVIN, VDD
Noise impacts can be reduced by buffering AVIN and VDD with a decoupling capacitor. It is recommended to
buffer AVIN and VDD with a X5R or X7R ceramic capacitor of at least 0.1
F connected between AVIN, AGND
and VDD, AGND respectively. The capacitor closest to the pin should be kept small (
< 0.22F) in order to keep a
low impedance at high frequencies. In general, there is no upper limit for the total capacitance.
Adding a low pass input filter at AVIN (e.g. by adding a resistor in series) is not mandatory for the TPS6236x to
filter out noise.
INDUCTOR SELECTION
The choice of the inductor type and value has an impact on the inductor ripple current, the transition point of
PFM to PWM operation, the output voltage ripple and accuracy. The subsections below support for choosing the
proper inductor.
Inductance Value
The TPS6236x is designed for best operation with a nominal inductance value of 1
H.
Choosing a smaller value than 1
H improves the load transient behavior, whereas choosing a higher value
reduces the ripple current resulting in a smaller output voltage ripple and better DC output regulation. The
inductor current ripple can be calculated as:
(5)
With:
VIN = Input Voltage
VOUT = Output Voltage
= Switching frequency, typ. 2.5 MHz
L = Inductor value
Inductor Saturation Current
The inductor needs to be selected for its current rating. To pick the proper saturation current rating, the maximum
inductor current can be calculated as:
(6)
With:
IOUT,MAX = Maximum output current
Since the inductance can be decreased by saturation effects and temperature impact, the inductor needs to be
chosen to have an effective inductance of at least 0.6
H under temperature and saturation effects.
Copyright
2011, Texas Instruments Incorporated
31
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