gm6250-3.6t92rl Gamma Microelectronics, gm6250-3.6t92rl Datasheet - Page 8

• Manufacturer Part Number: gm6250-3.6t92rl
• Description: Gm6250 Low Drop Out Regulators,ldo
• Manufacturer: Gamma Microelectronics

8
TEST CIRCUIT
CALCULATING POWER DISSIPATION
The GM6250 series precision linear regulators include thermal shutdown and current limit circuitry to
protect the devices. However, high power regulators normally operate at high junction temperatures so it
is important to calculate the power dissipation and junction temperatures accurately to be sure that you
use and adequate heat sink.
The thermal characteristics of an IC depend four factors:
1. Maximum Ambient Temperature T (°C)
2. Power Dissipation P (Watts)
3. Maximum Junction Temperature T (°C)
4. Thermal Resistance Junction to ambient R
These relationship of these four factors is expressed by equation (1):
Maximum ambient temperature and power dissipation are determined by the design while the maximum
junction temperature and thermal resistance depend on the manufacturer and the package type.
DIRECTIONS FOR USAGE
3. Please ensure the output current (I
Notes on Usage
1. Please use this IC within the stipulated absolute maximum ratings as the IC is liable to malfunction
2. There is a possibility theat, oscillation may occur as a result of the impedance present between the
outside of such parameters.
power supply and the IC's input. Where impedance is 10W or more, please use a capacitor (C )
of at least 1µF.
With a large output current, operations can be stabilised by increasing capacitor size (C ). If C
small and capacitor size (C ) is increased, there is a possibility of oscillation due to input impedance.
In such cases, operations can be stabilised by either increasing the size of C
stipulated continuous total power dissipation value (Pd) for the package.
Circuit 1
Circuit 2
V
IN
D
V
IN
+
1µF
(Tantalum)
L
A
J
V
OUT
IN
GM6250
) is less than Pd ÷ (V
V
V
IN
SS
Q
GM6250
JA
(°C/W)
V
A
V
SS
O
(Tantalum)
V
O
1µF
IN
- V
+
OUT
T = T + P X R
J
) and does not exceed the
Open
V
A
IN
A
or decreasing the size of C .
D
R
QJA
IN
L
IN
IN
is
L