TK11830 Ver la hoja de datos (PDF) - Toko America Inc
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TK11830 Datasheet PDF : 13 Pages
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TK11830
APPLICATION INFORMATION (CONT.)
PD (mW)
Tj = 150 °C
25
50
75
150
TA (°C)
750
600
450
300
150
0
0
MOUNTED
FREE AIR
50
100
150
TA (°C)
The components shown in the test circuit may be changed
for different operating conditions (input/output voltage,
output current, inductor type, etc.) The performance of the
DC-DC converter depends largely on the coil in use. To
optimize efficiency, a coil with a low DC resistance should
be used, such as the Toko 646CY471M. Oscillation will
begin with an inductor value as low as 100 µH. However,
if the Equivalent Series Resistance (ESR) is over 5 Ω,
oscillation may not occur. The input and output capacitors
should have a low ESR and high capacity since there is a
large ripple current present. For operation below 0 °C, the
capacitors should be selected for low ESR and good
temperature stability at reduced temperatures. This is
required to minimize ripple current. For low values of load
current, a smaller coil can be used. For higher current, a
large coil is needed to prevent saturation. When the coil
saturates, the current increases dramatically, resulting in
a severe overcurrent through the inductor. Please refer to
the following drawings.
INDUCTOR CURRENT WAVEFORM
(NORMAL)
OUT
VOUT
11830
R2
Di
COUT
R1
CFB 6
5
4
0.01
C RE F
TK1 1 8 3 0
1
2
3
1 µF
ON/OFF
RS D 300 k
VIN
L
CIN
GND
17.5 mm
Page 12
TIME
INDUCTOR CURRENT WAVEFORM
(SATURATED INDUCTOR)
TIME
January 1999 TOKO, Inc.
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