04S_02XC6367/68 02.09.12 14:41 ページ 424
XC6367/6368
Series
■Directions for use
ꢀNotes on Use
Take ample care to ensure that none of the IC's, nor the external component's, absolute maximum ratings are exceeded.
Fe extremely careful when selecting parts and do not limit your reference to the specifications and characteristics for the DC/DC converter
alone. The IC also depends, to a great extent, upon the external components.
Arrange the peripherals in the environs of the IC. In order to reduce wiring impedance, use short, thick wires. In particular, wire the load
capacitor as close as possible and strengthen the ground wiring sufficiently.
Ground current during switching may cause the IC's operations to become unstable due to changes in ground voltage, so please strengthen the
IC's GND pin surroundings.
ꢀExternal Components
■�External Components
1. Soft start time set up
If you wish to lengthen soft start time we recommend that you use the C or D versions of the series which
have soft start time externally set up.
Soft start time (TSS% is between MIN & MAX, as indicated in the graphs below, so please select soft start
condenser capacitance (CSS% to suit your application.
4
XC6367/XC6368CxxxMR (VOUT)
XC6367/XC6368D10xMR (FB)
VDD=VOUT=VOUT set up voltage×0.95V
VDD=VOUT=2.8V (3.0V set up)
VCE=0V→3.0V, RSS=470kΩ�
VCE=0V→3.0V, RSS=220kΩ�
ꢀꢀ
100
80
60
40
20
0
100
80
60
40
20
0
MAX
MAX
MIN
MIN
0.4
0.0
0.1
0.2
0.3
0.4
0.5
0.0
0.1
0.2
0.3
0.5
Soft Start Condenser Capacitance:CSSꢀ(μF)
Soft Start Condenser Capacitance:CSS (μF)
2. RꢁF1，CꢁF set up
fzfb = 1 ÷ ( ±π x CꢁF x RꢁF1 %
In order to achieve a value for fzfb within the range of 0.1kHz to ±0kHz, we recommend that values for
RꢁF1 & CꢁF are selected from the area indicated within the lines of fzfb = 0.1kHz and fzfb = ±0 kHz as
shown on the graph below. Please select combinations of values as close to the fzfb = 10kHz line as possible.
XC6367/XC6368B10xMR (FB)
XC6367/XC6368D10xMR (FB)
100000
10000
1000
100
10
0.1kHz
fzfb=10kHz
20kHz
1
200
300
400
500 600
RFB1 (kΩ)
700
800
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TOREX [ Torex Semiconductor ]
