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參數(shù)資料
| 型號： | RM2991JXQMLV |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 可調(diào)負電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 3 V-24 V ADJUSTABLE NEGATIVE LDO REGULATOR, 1 V DROPOUT, CDIP16 |
| 封裝： | CERAMIC, DIP-16 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 398K |
| 代理商： | RM2991JXQMLV |
Application Hints (Continued)
MINIMUM LOAD
A minimum load current of 500 A is required for proper op-
eration. The external resistor divider can provide the mini-
mum load, with the resistor from the adjust pin to ground set
to 2.4 k
.
SETTING THE OUTPUT VOLTAGE
The output voltage of the LM2991 is set externally by a resis-
tor divider using the following equation:
V
OUT =VREF x(1+R2/R1)(IADJ xR2)
where V
REF
= 1.21V. The output voltage can be pro-
grammed within the range of 3V to 24V, typically an even
greater range of 2V to 25V. The adjust pin current is about
60 nA, causing a slight error in the output voltage. However,
using resistors lower than 100 k
makes the adjust pin cur-
rent negligible. For example, neglecting the adjust pin cur-
rent, and setting R2 to 100 k
and V
OUT to 5V, results in an
output voltage error of only 0.16%.
ON/OFF PIN
The LM2991 regulator can be turned off by applying a TTL or
CMOS level high signal to the ON/OFF pin (see Adjustable
Current Sink Application).
FORCING THE OUTPUT POSITIVE
Due to an internal clamp circuit, the LM2991 can withstand
positive voltages on its output. If the voltage source pulling
the output positive is DC, the current must be limited to 1.5A.
A current over 1.5A fed back into the LM2991 could damage
the device. The LM2991 output can also withstand fast posi-
tive voltage transients up to 26V, without any current limiting
of the source. However, if the transients have a duration of
over 1 ms, the output should be clamped with a Schottky di-
ode to ground.
Typical Applications
Output Capacitor ESR Range
DS011260-5
Fully Isolated Post-Switcher Regulator
DS011260-6
LM2991
www.national.com
6
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