XC9116B02ADL TOREX [Torex Semiconductor], XC9116B02ADL Datasheet - Page 12

• Manufacturer Part Number: XC9116B02ADL
• Description: Step-Up DC/DC Converter-Backlight LED Driver
• Manufacturer: TOREX [Torex Semiconductor]

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■ TEST CIRCUITS
1. The measurement method of LX ON Resistance R
2. The measurement method of current limit ILIM
XC9116
The oscilloscope is used for measuring the Lx voltage when the driver transistor is ON.
●Circuit ① XC9116B02A series
●Circuit ②
●Circuit ④
Using the circuit ②, Lx ON resistance can be measured by adjusting Vpull voltage to set Lx voltage V
driver transistor is ON.
The oscilloscope is used for measuring the Lx voltage when the driver transistor is ON.
Using the circuit ④, current limit I
decreased while Vpull voltage is adjusted and Lx voltage V
V
V
IN
IN
R
I
LIM
SWON
= (Vpull - V
1uF
1uF
= 0.4 / ((Vpull - 0.4) /10)
A
VCE
Series
V
CE
Lx
V
CE
) / Rpull
V
CE
IN
IN
V
SS
V
SS
OSC
FB
Lx
FB
Lx
10ohm
LIM
2SK583
V
OSC
FB
can be calculated by the equation including Vpull voltage when FB voltage is
Rpull
220uF
300ohm
0.01uF
11kohm
1.1kohm
SWON
1uF
Vpull
V
Lx
when the driver transistor is ON.
Vpull
4.4V
●Circuit ① XC9116D02A series
V
●Circuit ③
IN
220uF
1uF
A
A
V
CE
V
CE
IN
V
SS
FB
Lx
Lx
V
FB
0.4V when the
A
V
Lx
A