參數(shù)資料
型號: LM2984T
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 電源管理
英文描述: Microprocessor Power Supply System
中文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PZFM11
文件頁數(shù): 11/16頁
文件大?。?/td> 398K
代理商: LM2984T
Typical Performance Characteristics
(Continued)
Application Hints
OUTPUT CAPACITORS
The LM2984 output capacitors are required for stability.
Without them, the regulator outputs will oscillate, sometimes
by many volts. Though the 10 μF shown are the minimum
recommended values, actual size and type may vary de-
pending upon the application load and temperature range.
Capacitor effective series resistance (ESR) also affects the
IC stability. Since ESR varies from one brand to the next,
some bench work may be required to determine the mini-
mum capacitor value to use in production. Worst case is usu-
ally determined at the minimum ambient temperature and
the maximum load expected.
Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief condi-
tions of negative input transients that might be characteristic
of a particular system.
Capacitors must also be rated at all ambient temperatures
expected in the system. Many aluminum type electrolytics
will freeze at temperatures less than 30C, reducing their
Ripple Rejection (V
OUT
)
DS011252-49
Ripple Rejection (V
buf
)
DS011252-50
Ripple Rejection (V
stby
)
DS011252-51
Output Voltage
DS011252-8
Device Dissipation vs
Ambient Temperature
DS011252-9
Output Capacitor ESR
(Standby Output, Pin 9)
DS011252-10
Output Capacitor ESR
(Buffer Output, Pin 10)
DS011252-11
Output Capacitor ESR
(Main Output, Pin 11)
DS011252-12
11
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