L6910TR datasheet(11/29 Pages) STMICROELECTRONICS

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L6910 - L6910A

Figure 11. Asymptotic Bode Plot of Converter's Gain

15A DEMO BOARD DESCRIPTION

The demo board shows the operation of the device in a general purpose application. This evaluation board al-

lows voltage adjustability from 0.9V to 5V through the switches S2-S5 according to the reported table when the

internal 0.9V reference is used (G1 closed). Output current in excess of 20A can be reached dependently on

the kind of mosfet used: up to three SO8 mosfet may be used for both High side and Low side switches. External

reference may be used for the regulation simply leaving open G1 and the switches S2-S5. The device may also

be disabled with the switch S1. The VCC input rail supplies the device while the power conversion starts from

the VIN input rail. The device is also able to operate with a single supply voltage; in this case the jumper G2 has

to be closed and a 5V to 12V input can be directly connected to the VIN input. The four layers demo board's

copper thickness is of 70

µm in order to minimize conduction losses considering the high current that the circuit

is able to deliver.The PGOOD signal is used as a logic level and it's been pulled up to VIN because there's no

other appropriate voltage available on the demo board. In case of input voltage higher than 7V (PGOOD Pin

Maximum Absolute Rating) a 5V reference is required. Figure 12 shows the demo board's schematic circuit

Figure 12. 15A Demo Board Schematic

Error Amplifier

ωΖ1

ωΖ2

ωP1

ωP2

ωESR

R5/R3

Modulator Gain

Compensation Network Gain

Error Amplifier

Closed Loop Gain

ωLC

UGATE

PHASE

LGATE

PGND

PGOOD

VFB

OSC

EAREF

VREF

GND

VCC

BOOT

C17

C16

C21

C15

VIN

GNDIN

VCC

GNDCC

REFIN

GNDREFIN

+VREF

GNDREF

C13

Q1-3

Q4-6

C14

OCSET

COMP

R10

SR12

SR13

R11

VOUT

PWRGD

GNDOUT

C1-C3

C4-

D03IN1513

C19

C18

C20

C22

C12

VOUT

Open Open Open Open

ON Open Open Open

Open

Open Open

ON Open Open

Open Open ON Open

Open Open Open ON

Open Open ON

0.9

1.2

1.5

1.8

2.5

3.3

5.0

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