L6615

14/20

Figure 13. Current sense methods.

6

APPLICATION IDEAS

In fig. 14 is showed a single section of a system in which several DC to DC modules can be paralleled,

typical solution whenever the load requires high current at low voltage; the converter is designed for a step

down configuration using a synchronous rectification controller (for example L6910 [1] or L6911 [2] ST de-

vice).

The L6615 reads the drop across the Rds(ON) of the OR-ing FET and the LM293 drives its gate, pulling

it down whenever a fault condition (e.g. short on the low side) appears.

on the input and output voltage).

Figure 14. 0.9 to 5V DC-Dc converter with Current Sharing and output hot-pluggability

a)

b)

c)

GATE

CONTROL

I

OUT

R

G

R

G

CS+

CS-

L6615

ORing FET

L

O

A

D

I

OUT

R

G

R

G

CS+

CS-

L6615

POWER

SUPPLY

L

O

A

D

R

SNS

POWER

SUPPLY

L

O

A

D

CS+

CS-

L6615

R

SNS

R

G

R

G

I

OUT

1:N

SENSING

CIRCUIT

1:N

GATE

CONTROL

I

OUT

R

G

R

G

CS+

CS-

L6615

ORing FET

L

O

A

D

I

OUT

R

G

R

G

CS+

CS-

L6615

POWER

SUPPLY

L

O

A

D

R

SNS

POWER

SUPPLY

L

O

A

D

CS+

CS-

L6615

R

SNS

R

G

R

G

I

OUT

1:N

SENSING

CIRCUIT

1:N

-SOUT

VOUT

P_GND

VIN

SH

VFB

COMP

BOOT

PGND

6

LM293

4

5

8

7

CS+

CS-

L6615

ADJ

COMP

CGA

GND

+S_OUT

VIN

GND

SS

LGATE

UGATE

PHASE

VCC

Vcc

SH

Q1

R1

L6910

-SOUT

VOUT

P_GND

VIN

SH

VFB

COMP

BOOT

PGND

6

LM293

4

5

8

7

CS+

CS-

L6615

ADJ

COMP

CGA

GND

+S_OUT

VIN

GND

SS

LGATE

UGATE

PHASE

VCC

Vcc

SH

Q1

R1

L6910