LM1084R HTC [HTC Korea TAEJIN Technology Co.], LM1084R Datasheet - Page 6

• Manufacturer Part Number: LM1084R
• Description: 5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
• Manufacturer: HTC [HTC Korea TAEJIN Technology Co.]

RIPPLE REJECTION
capacitor at the ripple frequency should be less than the value of R1 (normally 100Ω to 120Ω) for a proper
bypassing and ripple rejection approaching the values shown. The size of the required adjust pin capacitor is
a function of the input ripple frequency. If R1=100 Ω at 120Hz the adjust pin capacitor should be 25uF.
At 100kHz only 0.22uF is needed.
The output ripple will increase directly as a ratio of the output voltage to the reference voltage (V
OUTPUT VOLTAGE
LOAD REGULATION
resistance is about 0.004Ω per foot, transllating to 4mV/ft at 1A load current.
5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
The ripple rejection values are measured with the adjustment pin bypassed. The impedance of the adjust pin
The ripple rejection will be a function of output voltage, in circuits without an adjust pin bypass capacitor.
Connected as shown Figure.12 R
LM1084
LM1084
Figure 11.
Figure 12.
P
is not multiplied by the divider ratio. Using 16-gauge wire the parasitic line
the output and the adjust terminal. Placing a resistor between these
two terminals causes a constant current to flow through R1 and down
throuth R2 to set the overall output voltage.
Because IADJ is very small and constant it represents a small error
and it can usually be ignored.
because the LM1084 is a three terminal device.
will limit the load regulation.
bottom of the package. Negative side sensing is a true Kelvin
connection, with the bottom of the output divider returned to the
negative side of the load.
divider R1 is connected directly to the case not to the load. If R1
were connected to the load, the effective resistance between the
regulator and the load would be:
The LM1084 series develops a 1.25V reference voltage between
This current is normally the specified minium load current of 10mA.
True remote sheet specification it is not possible to provide,
The resistance of the wire connecting the regulator to the load
The data sheet specification for load regulation is measured at the
The best load regulation is obtained when the top of the resistor
[R
P
X(R2+R1)]/R1 , R
- 6 -
P
= Parasitic Line Resistance
OUT
/V
LM1084
REF
)
HTC