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參數(shù)資料
| 型號(hào)： | TPS70758PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數(shù)： | 22/40頁 |
| 文件大?。?/td> | 918K |
| 代理商： | TPS70758PWPRG4 |
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Input Capacitor
Output Capacitor
ESR and Transient Response
RESR
LESL
C
TPS70745, TPS70748
TPS70751, TPS70758
TPS70702
SLVS291D – MAY 2000 – REVISED DECEMBER 2007
For a typical application, an input bypass capacitor (0.1
F to 1F) is recommended. This capacitor filters any
high-frequency noise generated in the line. For fast transient conditions where droop at the input of the LDO may
occur because of high inrush current, it is recommended to place a larger capacitor at the input as well. The size
of this capacitor depends on the output current and response time of the main power supply, as well as the
distance to the VI pins of the LDO.
As with most LDO regulators, the TPS707xx requires an output capacitor connected between OUT and GND to
stabilize the internal control loop. The minimum recommended capacitance value is 10
F and the ESR
(equivalent series resistance) must be between 50m
and 2.5. Capacitor values 10
F or larger are acceptable,
provided the ESR is less than 2.5
. Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic
capacitors are all suitable, provided they meet the requirements described above. Larger capacitors provide a
wider range of stability and better load transient response. Table 3 provides a partial listing of surface-mount
capacitors suitable for use with the TPS707xx for fast transient response application.
This information, along with the ESR graphs, is included to assist in selection of suitable capacitance for the user
application. When necessary to achieve low height requirements along with high output current and/or high load
capacitance, several higher ESR capacitors can be used in parallel to meet the guidelines above.
Table 3. Partial Listing of TPS707xx-Compatible Surface-Mount Capacitors
VALUE
MANUFACTURER
MAXIMUM ESR
MFR PART NO.
22F
Kemet
345m
7495C226K0010AS
33F
Sanyo
100m
10TPA33M
47F
Sanyo
100m
6TPA47M
68F
Sanyo
45m
10TPC68M
LDOs typically require an external output capacitor for stability. In fast transient response applications, capacitors
are used to support the load current while the LDO amplifier is responding. In most applications, one capacitor is
used to support both functions.
Besides its capacitance, every capacitor also contains parasitic impedances. These parasitic impedances are
resistive as well as inductive. The resistive impedance is called equivalent series resistance (ESR), and the
inductive impedance is called equivalent series inductance (ESL). The equivalent schematic diagram of any
capacitor can therefore be drawn as shown in Figure 43.
Figure 43. ESR and ESL
In most cases one can neglect the effect of inductive impedance ESL. Therefore, the following application
focuses mainly on the parasitic resistance ESR.
Copyright 2000–2007, Texas Instruments Incorporated
29
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