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RT9602GS Datasheet(PDF) 9 Page - Richtek Technology Corporation

Part # RT9602GS
Description  Dual Channel Synchronous-Rectified Buck MOSFET Driver
PDF  11 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9602GS Datasheet(HTML) 9 Page - Richtek Technology Corporation

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RT9602
9
DS9602-08
March 2007
www.richtek.com
Figure 5. Power Dissipation vs. Frequency (RT9602)
Figure 6. Power Dissipatin vs. Frequency, PVCC = 5V
The method to improve the thermal transfer is to increase
the PCB copper area around the RT9602, first. Then, adding
a ground pad under IC to transfer the heat to the peripheral
of the board.
Power on Over-Voltage Protection Function
The RT9602 provides a protect function which can avoid
some short condition happened before power on.
The following discussion about the power on over-voltage
protection function of RT9602 is based on the experiments
of the high side MOSFET directly shorted to 12V. The test
circuit as shown in the typical application circuit (with
RT9241A/B dual-channel synchronous-rectified buck
controller) the VCC and the phase signals are measured
on the VCC pin and the phase pin of RT9602. The LGATE
signal is measured on the gate terminal of MOSEFET.
Figure 7 High Side Direct Short
Figure 8. High Side Direct Short
Time (50ms)
lLGATE >
VVcc >
PPEASE >
hrountCurrent >
Through
12V
Time (50ms)
VVcc >
PPEAS >
lLGATE >
lV
CORE
>
The operating junction temperature can be calculated from
the power dissipation curves (Figure 5 and Figure 6).
Assume the RT9602
’ s PVCC = VCC=12V, operating
frequency is 200kHz, and the CU=CL=1.5nF which emulate
the input capacitances of the high side and low side power
MOSFETs. From Figure 5, the power dissipation is 500mW.
In RT9602, the package thermal resistance
θJA is
127.67
°C/W, the operating junction temperature is
calculated as:
TJ = 127.67
°C/W x 500mW+ 25°C = 88.84°C
(11)
where the 25
°C is the ambient temperature.
Power Dissipation vs. Frequency
0
100
200
300
400
500
600
700
800
0
100
200
300
400
500
600
Frequency (kHz)
PVcc=Vcc=12V
CU=CL=1nF
CU=CL=2nF
CU=CL=3nF
CU=CL=4nF
CU=CL
=
5nF
Power Dissipation vs. Frequency
170
180
190
200
210
220
230
240
250
50
100
150
200
250
300
350
400
450
Frequency(kHz)
RT9809-20CV
CU=CL=2nF
CU=CL=3nF
CU=CL
=5nF
CU=CL=4nF
CU=CL=1nF



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