参数资料
型号: 1N5822G
厂商: ON Semiconductor
文件页数: 4/8页
文件大小: 123K
描述: DIODE SCHOTTKY 3A 40V DO-201AD
产品目录绘图: Rectifier DO-201AD Pkg
标准包装: 500
二极管类型: 肖特基
电压 - (Vr)(最大): 40V
电流 - 平均整流 (Io): 3A
电压 - 在 If 时为正向 (Vf)(最大): 525mV @ 3A
速度: 快速恢复 =< 500 ns,> 200mA(Io)
电流 - 在 Vr 时反向漏电: 2mA @ 40V
安装类型: 通孔
封装/外壳: DO-201AA,DO-27,轴向
供应商设备封装: DO-201AD
包装: 散装
产品目录页面: 1567 (CN2011-ZH PDF)
其它名称: 1N5822G-ND
1N5822GOS
1N5820, 1N5821, 1N5822
http://onsemi.com
4
NOTE 3 — 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)
= T
J(max)
R
JAPF(AV)
where TA(max)
= Maximum allowable ambient temperature
RJAPR(AV)(1)
TJ(max)
= Maximum allowable junction temperature
(125°C or the temperature at which thermal
runaway occurs, whichever is lowest)
PF(AV)
= Average forward power dissipation
PR(AV)
= Average reverse power dissipation
RJA
= Junction-to-ambient thermal resistance
Figures 1, 2, and 3 permit easier use of equation (1) by
taking reverse power dissipation and thermal runaway into
consideration. The figures solve for a reference temperature
as determined by equation (2).
TR
= T
J(max)
R
JAPR(AV)
(2)
Substituting equation (2) into equation (1) yields:
TA(max)
= T
R
R
JAPF(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 condition 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 common rectifier circuits, Table 1 indicates suggested
factors for an equivalent dc voltage to use for conservative
design, that is:
VR(equiv)
= V
(FM)
F (4)
The factor F is derived by considering the properties of the
various rectifier circuits and the reverse characteristics of
Schottky diodes.
EXAMPLE: Find TA(max)
for 1N5821 operated in a
12-volt dc supply using a bridge circuit with capacitive filter
such that IDC
= 2.0 A (I
F(AV)
= 1.0 A), I
(FM)/I(AV)
= 10, Input
Voltage = 10 V(rms), RJA
=
40°C/W.
Step 1. Find VR(equiv).Read F = 0.65 from Table 1,
VR(equiv)
= (1.41) (10) (0.65) = 9.2 V.
Step 2. Find TR
from Figure 2. Read T
R
= 108
°C
@ VR
= 9.2 V and R
JA
= 40
°C/W.
Step 3. Find PF(AV)
from Figure 6. **Read P
F(AV)
= 0.85 W
@I(FM)I(AV)
10 and IF(AV)
1.0A.
Step 4. Find TA(max)
from equation (3).
TA(max)
= 108
(0.85) (40) = 74
°C.
**Values given are for the 1N5821. Power is slightly lower
for the 1N5820 because of its lower forward voltage, and
higher for the 1N5822. Variations will be similar for the
MBR-prefix devices, using PF(AV)
from Figure 6.
Table 1. Values for Factor F
Circuit
Half Wave
Full Wave, Bridge
Full Wave,
Center Tapped*?
Load
Resistive
Capacitive*
Resistive
Capacitive
Resistive
Capacitive
Sine Wave
0.5
1.3
0.5
0.65
1.0
1.3
Square Wave
0.75
1.5
0.75
0.75
1.5
1.5
*Note that VR(PK)
2.0 V
in(PK).
?Use line to center tap voltage for Vin.
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