EN63A0QI-E Enpirion, EN63A0QI-E Datasheet - Page 17

• Manufacturer Part Number: EN63A0QI-E
• Description: Power Management Development Tools EN63A0QI Eval Board 12A Hi Eff Buck Con
• Manufacturer: Enpirion
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of EN63A0QI-E

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2.375 V to 6.6 V
• Output Current: 12 A
• Product: Power Management Development Tools
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: EN63A0QI

Application Information
Output Voltage Programming and loop
Compensation
The EN63A0QI output voltage is programmed
using a simple resistor divider network. A phase
lead capacitor plus a resistor are required for
stabilizing the loop. Figure 6 shows the required
components and the equations to calculate their
values.
The EN63A0QI 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 EN63A0QI uses a type IV compensation
network. Most of this network is integrated.
However, a phase lead capacitor and a resistor are
required in parallel with upper resistor of the
external feedback network (Refer to Figure 6). Total
compensation is optimized for use with three 47µF
output capacitance and will result in a wide loop
bandwidth and excellent load transient performance
for most applications. Additional capacitance may
be placed beyond the voltage sensing point outside
the control loop. Voltage mode operation provides
high noise immunity at light load. Furthermore,
voltage mode control provides superior impedance
matching
technologies.
In some cases modifications to the compensation
or output capacitance may be required to optimize
device performance such as transient response,
ripple, or hold-up time. The EN63A0QI provides the
capability to modify the control loop response to
allow for customization for such applications. For
more information, contact Enpirion Applications
Engineering support.
The feedback and compensation network values
©Enpirion 2012 all rights reserved, E&OE
07077
Figure 6: External Feedback/Compensation Network
to
ICs
processed
in
sub
90nm
Enpirion Confidential
May 9, 2012
depend on the input voltage and output voltage.
Calculate the external feedback and compensation
network values with the equations below.
R
*Round R
R
V
*Round R
C
*Round C
R1 = 12k
The feedback resistor network should be sensed at
the last output capacitor close to the device. Keep
the trace to VFB pin as short as possible.
Whenever possible, connect R
AGND pin instead of going through the GND plane.
Input Capacitor Selection
The EN63A0QI has been optimized for use with
two 1206 47µF input capacitors. Low ESR ceramic
capacitors are required with X5R or X7R dielectric
formulation.
formulations must not be used as these lose
capacitance with frequency, temperature and bias
voltage.
In
capacitors may be needed in parallel with the larger
capacitors in order to provide high frequency
decoupling. The capacitors shown in the table
below are typical input capacitors. Other capacitors
with similar characteristics may also be used.
Output Capacitor Selection
The EN63A0QI has been optimized for use with
three 1206 47µF output capacitors. Low ESR, X5R
or X7R ceramic capacitors are recommended as
the primary choice. Y5V or equivalent dielectric
formulations must not be used as these lose
capacitance with frequency, temperature and bias
voltage.
Recommended Output Capacitors table are typical
FB
A
B
A
(2 capacitors needed)
[ ] = (V
[ ] = 48,400 x V
[F] = 4.6 x 10
= 0.6V nominal
47µF, 10V, 20%
Description
some
X5R, 1206
Table 3: Recommended Input Capacitors
A
B
A
up to closest standard value
FB
up to closest standard value
down to closest standard value
The
applications,
x R
Y5V
A
-6
) / (V
/ R
capacitors
IN
Taiyo Yuden
[V]
A
OUT
[ ]
Murata
MFG
or
www.enpirion.com, Page 17
– V
lower
equivalent
FB
) [V]
GRM31CR61A476ME19L
shown
B
LMK316BJ476ML-T
value
directly to the
EN63A0QI
P/N
dielectric
in
ceramic
Rev: C
the