UCC28610
SLUS888C–JANUARY 2009–REVISED SEPTEMBER 2009 ......................................................................................................................................... www.ti.com
TYPICAL CHARACTERISTICS (continued)
Unless otherwise stated: VDD = 12V, VGG = 12V, ZCD = 1 V, FB = 0 V, GND = 0 V, a 0.1-µF capacitor between VDD and
GND, a 0.1-µF capacitor between VGG and GND, RCL = 33.2 kΩ, RMOT = 380 kΩ, –40°C < TA < +125°C, TJ = TA
PEAK DRV CURRENT
vs
TRANSCONDUCTANCE (1/RCL
PEAK DRV CURRENT
vs
AMBIENT TEMPERATURE
)
5
3.2
3.1
3.0
2.9
2.8
Best Results
I
= 0 mA
FB
24.3 kW < R < 100 kW
CL
4
3
2
1
Avoid Operation Here
0
0
10
20
30
40
50
-40 -25 -10
5
20 35 50 65 80 95 110 125
1/R – mS
T
– Ambient Temperature – °C
CL
A
Figure 11.
Figure 12.
MAXIMUM ON TIME
vs
MAXIMUM ON-TIME RESISTANCE
MAXIMUM ON TIME
vs
JUNCTION TEMPERATURE
4.3
6
R
= 383 kW
4.2
4.1
4.0
3.9
3.8
MOT
5
4
3
3.7
3.6
2
1
3.5
3.4
MODE
Latch Off
Shutdown/Retry
3.3
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
100
200
300
400
500
600
T
– Junction Temperature – °C
R
– Maximum On-Time Resistor – kW
J
MOT
Figure 13.
Figure 14.
10
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