EN2340QI-E Enpirion, EN2340QI-E Datasheet - Page 13

• Manufacturer Part Number: EN2340QI-E
• Description: Power Management IC Development Tools EVAL FOR EN2340QI
• Manufacturer: Enpirion
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of EN2340QI-E

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: EN2340QI
• Input Voltage: 4.5 V to 14 V
• Output Voltage: 5 V
• Output Current: 4 A

The EN2340QI output voltage is determined by the
voltage presented at the VFB pin. This voltage is
set by way of a resistor divider between VOUT and
AGND with the midpoint going to VFB.
The EN2340QI uses a type IV compensation
network.
However a phase lead capacitor and a resistor are
required in parallel with the upper resistor of the
external feedback network (see Figure 6). Total
compensation is optimized for either low output
ripple or small solution size, and will result in a wide
loop bandwidth and excellent load transient
performance for most applications. See Table 5 for
compensation values for both options based on
input and output voltage conditions.
In some cases modifications to the compensation
may be required. The EN2340QI provides the
capability to modify the control loop response to
allow for customization for specific applications.
For more information, contact Enpirion Applications
Engineering support ([e-mail]).
Input Capacitor Selection
The
capacitor. Low-cost, low-ESR ceramic capacitors
should be used as input capacitors for this
converter. The dielectric must be X5R or X7R
rated. Y5V or equivalent dielectric formulations
must not be used as these lose too much
capacitance with frequency, temperature and
bias voltage. In some applications, lower value
capacitors are needed in parallel with the larger,
©Enpirion 2012 all rights reserved, E&OE
06878
Figure 6: V
EN2340QI
Most of this network is integrated.
Components. RA equation is only valid
for Low V
solution size, see Table 5.
OUT
Resistor Divider & Compensation
requires
OUT
R
R
ripple option. For small
⎛
⎜ ⎜
⎝
A
B
V
nominal
=
=
Round
standard
the
FB
(
a
V
is
VOUT
V
OUT
calculated
180
FB
0.75V
22µF/1206
×
−
R
R
V
value
A
A
FB
up
(R
)
⎞
⎟ ⎟
⎠
value.
to
higher tha
A
in
closest
k
input
Ω
)
Enpirion Confidential
n
April 16, 2012
capacitors in order to provide high frequency
decoupling.
recommended input capacitors.
Recommended Input Capacitors
22µF, 16V,
X5R, 10%,
1206
22µF, 16V,
X5R, 20%,
1206
Output Capacitor Selection
As seen from Table 5, the EN2340QI has been
optimized for use with either two 47µF/1206 or two
22µF/0805 output capacitors. Low ESR ceramic
capacitors are required with X5R or X7R rated
dielectric formulation. Y5V or equivalent dielectric
formulations must not be used as these lose
too
temperature and bias voltage. Table 4 contains a
list of recommended output capacitors
Output ripple voltage is determined by the
aggregate output capacitor impedance. Capacitor
impedance, denoted as Z, is comprised of
capacitive reactance, effective series resistance,
ESR,
reactance.
Placing output capacitors in parallel reduces the
impedance and will hence result in lower ripple
voltage.
Recommended Output Capacitors
47µF, 6.3V, X5R,
20%, 1206
47µF, 10V, X5R,
20%, 1206
22µF, 10V, X5R,
20%, 0805
22µF, 10V, X5R,
20%, 0805
Description
Description
Table 4: Recommended Output Capacitors
much
Table 3: Recommended Input Capacitors
and
Z
Murata
Taiyo Yuden
effective
Total
1
capacitance
MFG
Table
=
Murata
Taiyo
Yuden
Panasonic
Taiyo
Yuden
Z
1
MFG
1
+
www.enpirion.com, Page 13
series
3
Z
GRM31CR61C226ME15
EMK316ABJ226ML-T
1
2
contains
+
GRM31CR60J476ME19L
LMK316BJ476ML-T
ECJ-2FB1A226M
LMK212BJ226MG-T
...
with
inductance,
+
Z
1
n
P/N
EN2340QI
P/N
frequency,
a
list
Rev: B
ESL
of