76113SK8 데이터 시트보기 (PDF) - Fairchild Semiconductor
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76113SK8 Datasheet PDF : 12 Pages
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HUF76113SK8
Test Circuits and Waveforms (Continued)
VGS
Ig(REF)
VDS
RL
DUT
+
VDD
-
FIGURE 19. GATE CHARGE TEST CIRCUIT
VDD
VDS
Qg(TOT)
VGS
VGS = 1V
0
Ig(REF)
0
Qg(5)
Qg(TH)
VGS = 5V
VGS = 10
FIGURE 20. GATE CHARGE WAVEFORMS
VDS
RL
VGS
RGS
DUT
+
VDD
-
VGS
FIGURE 21. SWITCHING TIME TEST CIRCUIT
Thermal Resistance vs. Mounting Pad Area
The maximum rated junction temperature, TJ(MAX), and the
thermal resistance of the heat dissipating path determines
the maximum allowable device power dissipation, PD(MAX),
in an application. Therefore the application’s ambient
temperature, TA (oC), and thermal resistance RθJA (oC/W)
must be reviewed to ensure that TJ(MAX) is never exceeded.
Equation 1 mathematically represents the relationship and
serves as the basis for establishing the rating of the part.
PDMAX = (---T----J---M---Z---A-θ---X-J---A--–----T----A-----)
(EQ. 1)
In using surface mount devices such as the SO-8 package,
the environment in which it is applied will have a significant
influence on the part’s current and maximum power
dissipation ratings. Precise determination of the PD(MAX) is
complex and influenced by many factors:
©2003 Fairchild Semiconductor Corporation
VDS
tON
td(ON)
tr
90%
tOFF
td(OFF)
tf
90%
10%
0
VGS
10%
0
50%
PULSE WIDTH
10%
90%
50%
FIGURE 22. SWITCHING TIME WAVEFORMS
1. Mounting pad area onto which the device is attached and
whether there is copper on one side or both sides of the
board
2. The number of copper layers and the thickness of the
board
3. The use of external heat sinks
4. The use of thermal vias
5. Air flow and board orientation
6. For non steady state applications, the pulse width, the
duty cycle and the transient thermal response of the part,
the board and the environment they are in.
Fairchild provides thermal information to assist the
designer’s preliminary application evaluation. Figure 23
defines the RθJA for the device as a function of the top
copper (component side) area. This is for a horizontally
HUF76113SK8 Rev. B1
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