EN23F0QI Datasheet, PDF(19/26 Page) Enpirion, Inc. – 15A Voltage Mode Synchronous Buck PWM

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EN23F0QI Datasheet, PDF (19/26 Pages) Enpirion, Inc. – 15A Voltage Mode Synchronous Buck PWM

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Application Information

Output Voltage Programming and Loop

Compensation

The EN23F0QI uses a Type IV Voltage Mode

compensation network. Type IV Voltage Mode

control is a proprietary Enpirion control scheme that

maximizes control loop bandwidth to deliver

excellent load transient responses and maintain

output regulation with pin point accuracy. For ease

of use, most of this network has been customized

and is integrated within the device package. The

EN23F0QI output voltage is programmed using a

simple resistor divider network (RA and RB). The

feedback voltage at VFB is nominally 0.6V. RA is

predetermined based on Table 5 and RB can be

calculated based on Figure 10. The values

recommended for COUT, CA, RCA and REA make up

the external compensation of the EN23F0QI. It will

vary with each PVIN and VOUT combination to

optimize on performance. The EN23F0QI solution

can be optimized for either smallest size or highest

performance. Please see Table 5 for a list of

recommended RA, CA, RCA, REA and COUT values for

each solution.

Figure 10: VOUT Resistor Divider & Compensation

Components. See Table 5 for details.

Input Capacitor Selection

The EN23F0QI requires three 22ÂµF/1206 input

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,

capacitors in order to provide high frequency

decoupling. Table 3 contains a list of recommended

input capacitors.

EN23F0QI

Recommended Input Capacitors

Description

MFG

P/N

22ÂµF, 16V, X5R,

10%, 1206

Murata

GRM31CR61C226ME15

22ÂµF, 16V, X5R, Taiyo

20%, 1206

Yuden

EMK316ABJ226ML-T

22ÂµF, 25V, X5R,

10%, 1210

Murata

GRM32ER61E226KE15L

22ÂµF, 25V, X5R, Taiyo

20%, 1210

Yuden

TMK325BJ226MM-T

Table 3: Recommended Input Capacitors

Output Capacitor Selection

As seen from Table 5, the EN23F0QI has been

optimized for use with three 47ÂµF/1206 plus one

100ÂµF/1206 for best performance. For smallest

solution size, various combinations of output

capacitance may be used. See Table 5 for details.

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 much capacitance with

frequency, 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, and effective series inductance, ESL

reactance.

Placing output capacitors in parallel reduces the

impedance and will hence result in lower ripple

voltage.

1 = 1 + 1 + ... + 1

Z Total Z1 Z 2

Recommended Output Capacitors

Description

47ÂµF, 6.3V, X5R,

20%, 1206

47ÂµF, 10V, X5R,

20%, 1206

22ÂµF, 10V, X5R,

20%, 0805

22ÂµF, 10V, X5R,

20%, 0805

MFG

Murata

Taiyo

Yuden

Panasonic

Taiyo

Yuden

P/N

GRM31CR60J476ME19L

LMK316BJ476ML-T

ECJ-2FB1A226M

LMK212BJ226MG-T

100ÂµF, 6.3V, X5R, Murata

GRM31CR60J107ME39L

20%, 1206

Taiyo

Yuden

JMK316BJ107ML-T

Table 4: Recommended Output Capacitors

Enpirion Confidential

www.enpirion.com, Page 19

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