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PDF ML781x Data sheet ( Hoja de datos )
| Número de pieza | ML781x | |
| Descripción | 3-TERMINAL POSITIVE VOLTAGE REGULATOR | |
| Fabricantes | Micro Electronics | |
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ML7800
SERIES
3-TERMINAL POSITIVE
VOLTAGE REGULATOR
The ML7800 series are 3-Terminal Positive Voltage Regulators. These regulators employ internal current-limiting, thermal-
shutdown and safe-area compensation, making them essentially indestructible. If adequate heat sinking is provided, they can
deliver over 1A output current (Please refer to the "thermal design" portion of application note). They are intended as fixed
voltage regulations in a wide range of applications including local (on-card) regulation for elimination of distributution
problems associated with single point regulation. In addition to use as fixed voltage regulators, these devices can be used with
external components to obtain adjustable output voltages and currents.
■ Package Outline
TO-220
1. OUT
2. GND
3. IN
TO-220F
321
ABSOLUTE MAXIMUM RATINGS (Ta=25℃)
PARAMETER SYMBOL
Maximum Rating
ML7805 to ML7809
Input Voltage
VIN
ML7812 to ML7820
ML7824
Storage Temperature Range Tstg
-40 to +125
Operating Temperature
Range
Operating Junction Temperature
Operating Ambient Temperature
Tj
Topr
Power Dissipation
PD
15(Tc≦70℃ )
35
35
40
-30 to +150
-30 to +75
UNIT
V
℃
℃
W
THERMAL RESISTANCE
Thermal Resistance
Junction-to-Ambient Temperature
Junction-to-Case
Θ ja 60
℃/W
Θ jc 5
ELECTRICAL CHARACTERISTICS (Tj=25℃,C1=0.33μF,Co=0.1μF)
PARAMETER SYMBOL
TEST CONDITIONS
ML7805A / ML7805FA
Output Voltage
Vo VIN=10V
Io=0.5A
Quiescent Current
IQ VIN=10V
Io=0mA
Load Regulation
ΔVo Io VIN=10V
Io=0.005A to 1.5A
Line Regulation
ΔVo Vin VIN=7 to 25V Io=0.5A
Ripple Rejection
RR VIN=10V
Output Noise Voltage
VNO VIN=10V
Average Temperature
Cofficient of Output Voltage
ΔVo / ΔT VIN=10V
Io=0.5A
ein=2Vp-p
BW=10Hz to 100KHz
Io=0.5A
f=120Hz
Io=0.5A
Measurement is to be conducted
in pulse testing.
MIN. TYP. MAX. UNIT
4.8 5.0 5.2
V
- 4.2 8.0 mA
- 15 100 mV
- 3 100 mV
62 78 - dB
- 40 - μV
- -1.1 - mV/℃
REV B
Page 1 of 11
1 page  
■ Typical Characteristics
ML7805 / 15 / 24
ML7805 / 15 / 24
REV B
Page 5 of 11
5 Page 
(4)
Thermal Design
The heat radiation balance model of the TO-220 with the heat sink is shown as follows.
Heat radiation balance
Tj = PLOSS X (θjc +θCH + θHS) + Ta
PLOSS = Vin X IQ + (Vin-Vout) X Iout
(℃ ) (4-1)
(W) (4-2)
Substituting "Eq.(4-2) into "Eq.(4-1)" obtains
Tj = [Vin X IQ +(Vin-Vout) X Iout] X (θjc +θCH +θHS)+Ta
(℃) (4-3)
In Eq.(4-3)
Vin, Iout, θCH, θHS, Ta depand on using condition.
Tj, IQ,Vout,θjc depend on IC depend on IC specification.
WhenθCH, IQ and Tj are assumed the following values,
Eq.(4-3) becomes Eq.(4-4).
θCH=0.3 to 0.4 (℃/W) Insert the mica paper (0.1t) and thermal conduction silicon grease between
the IC and heat sink and tighten them with the bolt by 4Kg*cm-min.
IQ = 5 to 6mA (max.)
Tj = 125℃ (max.)
Tj(max) = 125 = [5 X Vin + (Vin-Vout) X Iout] X (5+0.3+ θHS) +Ta
(℃)
(4-4)
When fix the Vout, Tj depends on the Vin, Iout, θHS and Ta.
It means;
Lower Vin and / or Iout are required to linit the temperature rise.
Smaller θHS is required for the effective heat reduce (i.e. using the large heat sink).
In the thermal design, when fix the Vin, Iout and Ta, selectthe heat sink which θHS is smaller that
the result of Eq.(4-4).
For more detail, please refer the heat resistance value mentioned in the specification of the heat sink
supplier.
REV B
Page 11 of 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet ML781x.PDF ] | |
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