IXD9213/14
© 2014 IXYS Corp.
7
Doc. No. IXD9213_DS, Rev. N0
Characteristics subject to change without notice
TYPICAL APPLICATION CIRCUIT
EXTERNAL COMPONENTS
C
, µF 10
C
, µF 10
Capacitors should be X7R or X5R series to minimize power losses.
LAYOUT AND USE CONSIDERATIONS
1. Wire external components as close to the IC as possible and use thick, short
connecting traces to reduce the circuit impedance. Please, pay special
attention to the V
IN
and GND wiring. Switching noise, which occurs from the
GND, may cause the instability of the IC, so, position V
IN
and V
CL
capacitors as
close to IC as possible (See recommended layout on the right).
2. Use ceramic capacitors of X7R or X5R type to minimize power losses.
3. Transitional voltage drops or voltage rising phenomenon could make the IC
unstable, if ratings are exceeded.
4. At PWM mode, switching frequency may vary, depend on input/output voltage, load, external
components value, and board layout. In addition, minimum on time generated may differ from
calculated value due IC propagation delay and internal power losses.
5. If the difference between V
IN
and V
OUT
is small, IC generates very wide pulses, and there is a possibility
that some cycles will be skipped completely at the heavy load current.
6. Inductor’s rated current exceeds Current Limit threshold to avoid damage, which may occur until
P-channel transistor turns off after Current Limiter activates, but pulse current may exceed this value.
7. Use of the IC at voltages below recommended voltage range may lead to instability.
8. In PWM/PFM automatic switching mode, if difference between input/output voltages is small and load
is very low, inductor current may reverse decreasing IC efficiency.
9. If the output voltage remains below the short circuit protection threshold voltage at the end of the soft
start, IC will stop operation.
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