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参数资料
| 型号： | TPS64202DBVR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.15 A SWITCHING CONTROLLER, PDSO6 |
| 封装： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 7/29页 |
| 文件大小： | 596K |
| 代理商： | TPS64202DBVR |
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TPS64200,TPS64201
TPS64202,TPS64203
SLVS485 AUGUST 2003
www.ti.com
15
Selecting the Output Capacitor
The value of the output capacitor depends on the output voltage ripple requirements as well as the maximum
voltage deviation during a load transient. The TPS6420x require a certain ESR value for proper operation. Low
ESR tantalum capacitors or PosCap work best in the application. A ceramic capacitor with up 1
F may be used
in parallel for filtering short spikes. The output voltage ripple is a function of both the output capacitance and
the ESR value of the capacitor. For a switching frequency which is used with the TPS6420x, the voltage ripple
is typically between 90% and 95% due to the ESR value.
DVpp + DI
ESR
)
1
8
C
O
[ 1.1 DI
ESR
(14)
ESR, max
[
DVpp
1.1
DI
(15)
The output capacitance typically increases with load transient requirements. For a load step from zero output
current to its maximum, the following equation can be used to calculate the output capacitance:
C
O +
L
DI 2
O
(V
I *
V
O
)x
DV
(16)
Table 4. Capacitors Used in the Application
TYPE
MANUFACTURER
CAPACITANCE
ESR
VOLTAGE RATING
6TPB47M (PosCap)
Sanyo
47
F
0.1
6.3 V
T491D476M010AS
Kemet
47
F
0.8
10 V
B45197A
Epcos
47
F
0.175
16 V
B45294R1107M40
Epcos
100
F
0.045
6.3 V
594D476X0016C2
Vishay
47
F
0.11
16 V
Output Voltage Ripple
Output voltage ripple causes the output voltage to be higher or lower than set by the resistor divider at the
feedback pin. If the application runs with minimum on-time, the ripple (half of the peak-to-peak value) adds to
the output voltage. In an application which runs with minimum off-time, the output voltage is lower by the amount
of ripple (half of the peak-to-peak value) at the output.
Snubber Design
For low output current, the TPS6420x work in discontinuous current mode. When the current in the inductor
drops to zero, the inductor and parasitic capacitance form a resonant circuit, which causes oscillations when
both, diode and PMOS do not conduct at the end of each switching cycle. The oscillation can easily be damped
by a RC-snubber. The first step in the snubber design is to measure the oscillation frequency of the sine wave.
Then, a capacitor has to be connected in parallel to the Schottky diode which causes the frequency to drop to
half of its original value. The resistor is selected for optimum transient response (aperiodic).
R
+ 2pfL
f measured resonant frequency
L inductance used
(17)
Selecting the Right Device for the Application
The TPS6420x step-down controllers either operate with a fixed on-time or a fixed off-time control. It mainly
depends on the input voltage to output voltage ratio if the switching frequency is determined by the
minimum-on-time or the minimum-off-time. To select the right device for an application see the table below:
INPUT TO OUTPUT VOLTAGE RATIO
SWITCHING FREQUENCY
DETERMINED BY
PROPOSED DEVICE FOR
HIGH SWITCHING
FREQUENCY
PROPOSED DEVICE FOR
LOW SWITCHING
FREQUENCY
VI >> VO (e.g. VI = 5 V VO = 1.5 V)
Minimum ontime
TPS64203
TPS64200, TPS64201
VI ≈ VO (e.g. VI = 3.8 V VO = 3.3 V)
Minimum offtime
TPS64202
TPS64200, TPS64201
相关PDF资料 |
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| TPS64200DBVRG4 | 0.15 A SWITCHING CONTROLLER, PDSO6 |
| TPS64201DBVR | 0.15 A SWITCHING CONTROLLER, PDSO6 |
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| TPS64202DBVTG4 | 功能描述:DC/DC 开关控制器 Adj Hi-Efficient Step-Dwn 20uA SOT-23 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS64202EVM-023 | 功能描述:电源管理IC开发工具 TPS64202-023 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS64203DBVR | 功能描述:DC/DC 开关控制器 Adj Hi-Efficient Step-Dwn 20uA SOT-23 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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