ADP2116ACPZ-R7 datasheet(31/36 Pages) AD

31 / 36 page

ADP2116

Rev. 0 | Page 31 of 36

Calculate the compensation component values of the

feedback loop by using the following equation:

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

REF

OUT

CROSS

COMP

)

(

where:

gm = 550 μS.

GCS = 4 A/V.

VREF = 0.6 V.

VOUT = 1.2 V.

COUT = 0.8 × (47 + 100) μF (capacitance derated by 20% to

account for dc bias).

From Equation 18,

RCOMP = 30 kΩ.

Substituting RCOMP in Equation 19 yields CCOMP = 820 pF.

SYSTEM CONFIGURATION

Complete the following steps to further configure the ADP2116

for this design example:

Set the switching frequency (fSW) to 600 kHz (see Table 5)

by connecting the FREQ pin through an 8.2 kΩ resistor

to GND.

Tie SCFG to VDD and use the CLKOUT signal to

synchronize other converters on the same board with the

ADP2116.

Tie OPCFG through an 82 kΩ resistor to GND for 3 A/3 A

maximum output current operation and to enable pulse

skip mode at light load conditions (see Table 7).

A schematic of the ADP2116 as configured in the design example

described in the Design Example section is shown in Figure 71.

Other configurations are shown in Figure 72 to Figure 74. An

application circuit of a single interleaved, dual-phase, 6 A output

is shown in Figure 72. The schematic in Figure 73 depicts an

application circuit with a 3A/2A dual-output load and a 300 kHz

switching frequency, and the schematic of a dual-output converter

that works at 1.2 MHz with an adjustable VOUT1 and VOUT2 is shown

in Figure 74.

Table 11. Channel 2 Circuit Settings

Circuit Parameter

Setting

Value

Output Voltage, VOUT

Nominal

1.2 V

Reference Voltage, VREF

Typical

0.6 V

Error Amplifier Transconductance, gm

Typical

550 μS

Current-Sense Gain, GCS

Typical

4 A/V

Switching Frequency, fSW

See Step 2

600 kHz

Crossover Frequency, fCROSS

1/12 fSW

50 kHz

Zero Frequency, fZERO

1/8 fCROSS

6.25 kHz

Output Inductor, LOUT

Step 3

2.2 μH

Output Capacitor, COUT

Step 4

(47 + 100) μF

Compensation Resistor, RCOMP

See Equation 18

30 kΩ

Compensation Capacitor, CCOMP

See Equation 19

820 pF

Table 12 provides the recommended inductor, output capacitor,

and compensation component values for a set of popular input

and output voltage combinations.

Table 12. Selection Table of L, COUT, and Compensation Values

fSW (kHz)

VIN (V)

VOUT (V)

Maximum Load (A)1

L (μH)

COUT (μF)

RCOMP (kΩ)

CCO P (pF)

300

3.3

3.0

6.8

100

1600

300

2.5

3.0

5.6

122 (22 + 100)

1800

300

1.8

3.0

4.7

147 (47 + 100)

2200

300

1.2

3.0

3.3

247 (47 + 2 × 100)

1600

600

3.3

3.0

3.3

750

600

2.5

3.0

3.3

69 (22 + 47)

820

600

1.8

3.0

2.2

100

820

600

1.2

3.0

2.2

147 (47 + 100)

820

600

1.2

6.0

2 × 2.2

294 (2 × 47 + 2 × 100)

1600

1200

2.5

3.0

1.0

390

1200

1.8

3.0

1.0

57 (10 + 47)

390

1200

1.2

3.0

1.0

69 (22 + 47)

470

1200

1.2

6.0

2 × 1.0

141 (3 × 47)

910

1200

0.8

3.0

1.0

122 (22 + 100)

390

1 A maximum load of 6.0 A is available only with the single interleaved, dual-phase, 6 A output configuration (see

Figure 72

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