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C3225X5R1C22M Datasheet(PDF) 10 Page - Richtek Technology Corporation

Part # C3225X5R1C22M
Description  3A, 23V, 1.2MHz Synchronous Step-Down Converter
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

C3225X5R1C22M Datasheet(HTML) 10 Page - Richtek Technology Corporation

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RT8293B
10
DS8293B-03
March 2011
www.richtek.com
Hiccup Mode
For the RT8293BH, it provides Hiccup Mode Under Voltage
Protection (UVP). When the FB voltage drops below half
of the feedback reference voltage, VFB, the UVP function
will be triggered and the RT8293BH will shut down for a
period of time and then recover automatically. The Hiccup
Mode UVP can reduce input current in short-circuit
conditions.
Latch Off Mode
For the RT8293BL, it provides Latch Off Mode Under
Voltage Protection (UVP). When the FB voltage drops
below half of the feedback reference voltage, VFB, the UVP
will be triggered and the RT8293BL will shut down in Latch
Off Mode. In shutdown condition, the RT8293BL can be
reset by EN pin or power input VIN.
Inductor Selection
The inductor value and operating frequency determine the
ripple current according to a specific input and output
voltage. The ripple current
∆IL increases with higher VIN
and decreases with higher inductance.
OUT
OUT
L
IN
VV
I =1
f LV
 
×−
 
×
 
Figure 4. The Resistors can be Selected to Set IC
Lockout Threshold
Having a lower ripple current reduces not only the ESR
losses in the output capacitors but also the output voltage
ripple. High frequency with small ripple current can achieve
highest efficiency operation. However, it requires a large
inductor to achieve this goal.
For the ripple current selection, the value of
∆IL= 0.24(IMAX)
will be a reasonable starting point. The largest ripple
current occurs at the highest VIN. To guarantee that the
ripple current stays below the specified maximum, the
inductor value should be chosen according to the following
equation :
OUT
OUT
L(MAX)
IN(MAX)
VV
L =1
f
IV
 
×−
 
×∆
 
The inductor's current rating (caused a 40
°C temperature
rising from 25
°C ambient) should be greater than the
maximum load current and its saturation current should
be greater than the short circuit peak current limit. Please
see Table 2 for the inductor selection reference.
Table 2. Suggested Inductors for Typical
Application Circuit
Component
Supplier
Series
Dimensions
(mm)
TDK
VLF10045
10 x 9.7 x 4.5
TDK
SLF12565
12.5 x 12.5 x 6.5
TAIYO
YUDEN
NR8040
8 x 8 x 4
OUT
IN
RMS
OUT(MAX)
IN
OUT
V
V
I
= I1
VV
This formula has a maximum at VIN = 2VOUT, where
IRMS = IOUT/2. This simple worst-case condition is
commonly used for design because even significant
deviations do not offer much relief.
Choose a capacitor rated at a higher temperature than
required. Several capacitors may also be paralleled to
meet size or height requirements in the design.
For the input capacitor, two 10
µF low ESR ceramic
capacitors are recommended. For the recommended
capacitor, please refer to Table 3 for more detail.
The selection of COUT is determined by the required ESR
to minimize voltage ripple.
Moreover, the amount of bulk capacitance is also a key
for COUT selection to ensure that the control loop is stable.
Loop stability can be checked by viewing the load transient
response as described in a later section.
The output ripple,
∆VOUT , is determined by :
CIN and COUT Selection
The input capacitance, CIN, is needed to filter the
trapezoidal current at the source of the high side MOSFET.
To prevent large ripple current, a low ESR input capacitor
sized for the maximum RMS current should be used. The
RMS current is given by :
OUTL
OUT
1
V
I
ESR
8fC

≤ ∆+


VIN
EN
GND
BOOT
FB
SW
7
5
2
3
1
L
R1
R2
VOUT
VIN
RT8293B
SS
8
CSS
COMP
CC
RC
CP
6
4,
9 (Exposed Pad)
CBOOT
COUT
CIN
100k
8V
12V
REN2
REN1
10
µF


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