l6730cqtr STMicroelectronics, l6730cqtr Datasheet - Page 15

• Manufacturer Part Number: l6730cqtr
• Description: Adjustable Step-down Controller With Synchronous Rectification
• Manufacturer: STMicroelectronics

L6730C - L6730D
5.4
5.5
Figure 6.
Internal and external references
It is possible to set two internal references, 0.6V and 1.2V or provide an external reference from
0V to 2.5V. The maximum value of the external reference depends on the V
the clamp operates at about 2V (typ.), while with V
reference is 2.5V (typ.).
●
●
●
Providing an external reference from 0V to 450mV the output voltage will be regulated but
some restrictions must be considered:
●
●
●
To set the resistor divider it must be considered that a 100K pull-down resistor is integrated into
the device (see
pin is captured by the device at the start-up when Vcc is about 4V.
Error amplifier
V
Error amplifier reference
CCDR
V
V
V
The minimum OVP threshold is set at 300mV;
The under-voltage-protection doesn’t work;
The PGOOD signal remains low;
EAREF
EAREF
EAREF
EAREF
100K
from 80% to 95% of V
from 95% to 100% of V
from 0% to 80% of V
Figure
6.). Finally it must be taken into account that the voltage at the EAREF
CCDR
CCDR
CCDR
External reference
V
V
REF
REF
2.5V
= 1.2V
= 0.6V
CC
greater than 5V the maximum external
1.2V
EXT
0.6V
Error Amplifier Ref.
CC
Device description
: with V
CC
= 4V
15/50