76132SK8 Просмотр технического описания (PDF) - Intersil
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76132SK8 Datasheet PDF : 11 Pages
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HUF76132SK8
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
Qg(TH)
Qgs
Ig(REF)
0
Qg(5)
Qgd
VGS = 5V
VGS = 10V
FIGURE 20. GATE CHARGE WAVEFORMS
VDS
RL
VGS
VGS
RGS
DUT
+
VDD
-
FIGURE 21. SWITCHING TIME TEST CIRCUIT
Thermal Resistance vs. Mounting Pad Area
The maximum rated junction temperature, TJM, and the
thermal resistance of the heat dissipating path determines
the maximum allowable device power dissipation, PDM, in an
application. Therefore the application’s ambient
temperature, TA (oC), and thermal resistance RθJA (oC/W)
must be reviewed to ensure that TJM is never exceeded.
Equation 1 mathematically represents the relationship and
serves as the basis for establishing the rating of the part.
PDM = (---T----J--Z-M--θ----J-–--A--T----A-----)
(EQ. 1)
In using surface mount devices such as the SOP-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 PDM is complex
and influenced by many factors:
7
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 WAVEFORM
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.
Intersil 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 positioned
FR-4 board with 1oz copper after 1000 seconds of steady
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