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1N5819 Datasheet(PDF) 2 Page - Motorola, Inc

Part # 1N5819
Description  SCHOTTKY BARRIER RECTIFIERS 1 AMPERE 20, 30 and 40 VOLTS
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

1N5819 Datasheet(HTML) 2 Page - Motorola, Inc

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125
115
105
95
85
75
20
15
10
7.0
5.0
4.0
3.0
2.0
°
VR, DC REVERSE VOLTAGE (VOLTS)
Figure 1. Maximum Reference Temperature
1N5817
40
30
23
60
80
R
θJA (°C/W) = 110
125
115
105
95
85
75
20
15
10
7.0
5.0
30
4.0
3.0
40
30
23
R
θJA (°C/W) = 110
80
60
Figure 2. Maximum Reference Temperature
1N5818
125
115
105
95
85
75
20
15
10
7.0
5.0
30
4.0
40
R
θJA (°C/W) = 110
60
80
Figure 3. Maximum Reference Temperature
1N5819
Circuit
Load
Half Wave
Resistive
Capacitive*
Full Wave, Bridge
Resistive
Capacitive
Full Wave, Center Tapped* †
Resistive
Capacitive
Sine Wave
Square Wave
0.5
0.75
1.3
1.5
0.5
0.75
0.65
0.75
1.0
1.5
1.3
1.5
40
30
23
°
VR, DC REVERSE VOLTAGE (VOLTS)
VR, DC REVERSE VOLTAGE (VOLTS)
*Note that VR(PK) ≈ 2.0 Vin(PK).
Use line to center tap voltage for Vin.
Table 1. Values for Factor F
°
1N5817 1N5818 1N5819
2
Rectifier Device Data
NOTE 1 — DETERMINING MAXIMUM RATINGS
Reverse power dissipation and the possibility of thermal runaway
must be considered when operating this rectifier at reverse voltages
above 0.1 VRWM. Proper derating may be accomplished by use of
equation (1).
TA(max) =
where TA(max) =
TJ(max) =
PF(AV) =
PR(AV) =
R
θJA =
TJ(max) – R
θJAPF(AV) – RθJAPR(AV)
Maximum allowable ambient temperature
Maximum allowable junction temperature
(1)
Average forward power dissipation
(125
°C or the temperature at which thermal
runaway occurs, whichever is lowest)
Average reverse power dissipation
Junction–to–ambient thermal resistance
Figures 1, 2, and 3 permit easier use of equation (1) by taking re-
verse power dissipation and thermal runaway into consideration. The
figures solve for a reference temperature as determined by equation
(2).
TR = TJ(max) – R
θJAPR(AV)
(2)
Substituting equation (2) into equation (1) yields:
TA(max) = TR – R
θJAPF(AV)
(3)
Inspection of equations (2) and (3) reveals that TR is the ambient
temperature at which thermal runaway occurs or where TJ = 125°C,
when forward power is zero. The transition from one boundary condi-
tion to the other is evident on the curves of Figures 1, 2, and 3 as a
difference in the rate of change of the slope in the vicinity of 115
°C. The
data of Figures 1, 2, and 3 is based upon dc conditions. For use in com-
mon rectifier circuits, Table 1 indicates suggested factors for an equiv-
alent dc voltage to use for conservative design, that is:
(4)
VR(equiv) = Vin(PK) x F
The factor F is derived by considering the properties of the various rec-
tifier circuits and the reverse characteristics of Schottky diodes.
EXAMPLE: Find TA(max)for1N5818operatedina12–voltdcsupply
using a bridge circuit with capacitive filter such that IDC=0.4A(IF(AV)=
0.5 A), I(FM)/I(AV) = 10, Input Voltage = 10 V(rms), R
θJA = 80°C/W.
Step 1. Find VR(equiv). Read F = 0.65 from Table 1,
Step 1. Find
∴ VR(equiv) = (1.41)(10)(0.65) = 9.2 V.
Step 2. Find TR from Figure 2. Read TR = 109°C
Step 1. Find @ VR = 9.2 V and R
θJA = 80°C/W.
Step 3. Find PF(AV) from Figure 4. **Read PF(AV) = 0.5 W
@
I(FM)
I(AV)
= 10 and IF(AV) = 0.5 A.
Step 4. Find TA(max) from equation (3).
Step 4. Find TA(max) = 109 – (80) (0.5) = 69°C.
**Values given are for the 1N5818. Power is slightly lower for the
1N5817 because of its lower forward voltage, and higher for the
1N5819.


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