l6730cqtr STMicroelectronics, l6730cqtr Datasheet - Page 8

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

Pin connections and functions
Table 3.
8/50
10
4
5
6
7
8
9
Pins connection
SS/INH
EAREF
COMP
T
GND
OSC
MASK
FB
By connecting this pin to V
values for the leading edge blanking time on the peak-over-current-protection.
The device captures the analog value present at this pin at the start-up when
V
All the internal references are referred to this pin.
This pin is connected to the error amplifier inverting input. Connect it to Vout
through the compensation network. This pin is also used to sense the output
voltage in order to manage the over voltage conditions and the PGood signal.
This pin is connected to the error amplifier output and is used to compensate
the voltage control loop.
The soft-start time is programmed connecting an external capacitor from this
pin and GND. The internal current generator forces a current of 10 A through
the capacitor. This pin is also used to inhibit the device: when the voltage at
this pin is lower than 0.5V the device is disabled.
It is possible to set two internal references 0.6V / 1.2V or provide an external
reference from 0V to 2.5V:
– V
– V
– V
An internal clamp limits the maximum V
captures the analog value present at this pin at the start-up when V
the UVLO threshold.
Connecting an external resistor from this pin to GND, the external frequency
can be increased according with the following equation:
Connecting a resistor from this pin to V
be lowered according with the following equation:
If the pin is left open, the switching frequency is 400 KHz. Normally this pin is at
a voltage of 1.2V. In OVP the pin is pulled up to 4.5V (only in latched mode).
Don’t connect a capacitor from this pin to GND.
CC
EAREF
EAREF
EAREF
meets the UVLO threshold.
from 80% to 95% of V
from 95% to 100% of V
from 0% to 80% of V
Fsw
Fsw
CCDR
400
400
CCDR
CCDR
or ground it is possible to select two different
CCDR
KHz
KHz
CCDR
External Reference
EAREF
V
V
REF
REF
R
R
. 9
. 3
(5V), the switching frequency can
OSC
OSC
=1.2V
at 2.5V (typ.). The device
88
01
=0.6V
(
(
K
K
10
10
7
6
)
)
L6730C - L6730D
CC
meets