參數(shù)資料
型號(hào): HCPL-0302-060E
廠商: AGILENT TECHNOLOGIES INC
元件分類(lèi): 光電耦合器
英文描述: 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER
封裝: SO-8
文件頁(yè)數(shù): 4/16頁(yè)
文件大小: 130K
代理商: HCPL-0302-060E
12
Selecting the Gate Resistor (Rg) for HCPL-3020
Step 1: Calculate Rg minimum from the IOL peak specification. The IGBT and Rg in Figure 17 can
be analyzed as a simple RC circuit with a voltage supplied by the HCPL-3020.
Rg
VCC – VOL
IOLPEAK
=
24 - 1
0 . 4
=
57.5
The VOL value of 1 V in the previous equation is the VOL at the peak current of 0.4 A. (See Figure
4).
Step 2: Check the HCPL-3020 power dissipation and increase Rg if necessary. The HCPL-3020 total
power dissipation (PT) is equal to the sum of the emitter power (PE) and the output power (PO).
PT = PE + PO
PE = IF VF Duty Cycle
PO = PO(BIAS) + PO(SWITCHING) = ICC VCC + ESW (Rg;Qg) f
= (ICCBIAS + KICC Qg f) VCC + ESW (Rg;Qg) f
where
KICC Qg f is the increase in ICC due to switching and KICC is a constant of 0.001 mA/(nC*kHz).
For the circuit in Figure 17 with IF (worst case) = 10 mA, Rg = 57.5
, Max Duty Cycle = 80%,
Qg = 100 nC, f = 20 kHz and TAMAX = 85°C:
PE = 10 mA 1.8 V 0.8 = 14 mW
PO = [(3 mA + (0.001 mA/nC kHz) 20 kHz 100 nC)] 24 V + 0.31 20 kHz
= 126 mW < 250 mW (PO(MAX)) @ 85°C
The value of 3 mA for ICC in the previous equation is the max. ICC over entire operating
temperature range.
Since PO for this case is less than PO(MAX), Rg = 57.5 is alright for the power dissipation.
Figure 18. Energy dissipated in the HCPL-3020 and
HCPL-0302 and for each IGBT switching cycle.
Esw
ENERGY
PER
SWITCHING
CYCLE
J
0
Rg – GATE RESISTANCE –
100
1.5
20
4.0
40
1.0
60
80
3.5
Qg = 50 nC
Qg = 100 nC
Qg = 200 nC
Qg = 400 nC
3.0
2.0
0.5
2.5
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