XC9128/XC9129
Series
■TEST
CIRCUITS
*1
< Circuit No.1 >
Wave Form Measure Point
L
Lx
VOUT
C
FB
R
FB1
C
L1
C
L2
10kΩ
FO
VFO
PGND
AGND
AEN/
VAEN/
VMODE
V
R
FB2
※
External Components
R
L
V
L : 4.7uH(LTF5022T-4R7N2R0 : TDK)
C
IN
: 10uF (ceramic)
C
L1
: 22uF (ceramic)
C
L2
: 10uF (ceramic)
A
BAT
A
VIN
V
C
IN
VEN
EN
MODE
FB
Wave Form Measure Point
< Circuit No.2 >
< Circuit No.3 >
Lx
VOUT
A
A
FB
A
Lx
VOUT
A
A
BAT
MODE
BAT
MODE
C
IN
VIN
EN
FB
VMODE
VIN
C
IN
EN
FB
VMODE
VOUT
FO
VEN
PGND
AEN/
A
VAEN/
FO
VEN
PGND
※
External Components
AEN/
VFB
AGND
AGND
C
IN
: 1uF (ceramic)
※
External Components
C
IN
: 1uF (ceramic)
< Circuit No.4 >
Wave Form Measure Point
Rpull
Lx
Vpull
A
VIN
BAT
MODE
VOUT
<Circuit No.5 >
Lx
VOUT
BAT
A
VMODE
C
IN
FB
VLx
FO
VAEN/
VIN
PGND
MODE
VOUT
C
IN
VEN
A
VFO
EN
FB
EN
FB
VAEN/
VFB
C
OUT
FO
AEN/
AEN/
PGND
AGND
AGND
※
External Components
C
IN
: 1uF (ceramic)
Rpull : 300Ω
※
External Components
C
IN
: 1uF (ceramic)
C
OUT
: 1uF (ceramic)
<Circuit No.6 >
Wave Form Measure Point
Rpull
Lx
Vpull
A
VIN
BAT
MODE
FB
VMODE
A
VFO
FO
AEN/
FB
PGND
AGND
VOUT
V
VEN
VOUT
<Circuit No.7 >
Wave Form Measure Point
Lx
SBD
V1
Rpull
BAT
Vpull
C
LX
VIN
FO
VEN
PGND
AGND
AEN/
VMODE
C
IN
EN
FB
C
OUT
VOUT
MODE
VOUT
C
IN
EN
※
External Components
C
IN
: 1uF (ceramic)
Rpull : 300Ω
※
External Components
C
IN
: 1uF (ceramic)
C
OUT
: 1uF (ceramic)
SBD : XBS304S17(TOREX)
Rpull : 0.5Ω
Measurement method for ON resistance of the Lx switch
Using the layout of circuit No.7 above, set the L
X
pin voltage to 50mV by adjusting the Vpull voltage whilst the N-ch driver
transistor is turned on. Then, measure the voltage difference between both ends of Rpull. ON Resistance is calculated by using
the following formula:
R
LXN
=0.05 ÷ ((V1 – 0.05) ÷ 0.5)
where V1 is a voltage between SBD and Rpull. L
X
pin voltage and V1 are measured by an oscilloscope.
*1: The XC9129 series does not have the AEN/ pin and the FO pin. When the XC9129 series is measured, the FO and AEN
pins are not effective in the above mentioned test circuits, they are NC.
11/13
TOREX [ TOREX SEMICONDUCTOR ]
