L6730C STMicroelectronics, L6730C Datasheet - Page 26
![IC CTRLR ADJ STPDN SYNC 20-TSSOP](/photos/7/59/75992/l6730_sml.jpg)
L6730C
Manufacturer Part Number
L6730C
Description
IC CTRLR ADJ STPDN SYNC 20-TSSOP
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet
1.L6730DTR.pdf
(50 pages)
Specifications of L6730C
Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
Adj to 0.6V
Frequency - Switching
100kHz ~ 1MHz
Voltage - Input
1.8 ~ 14 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
Package
HTSSOP20, QFN4x4 24L
For Use With
497-5868 - EVAL BOARD 30A 400KHZ L6730497-5501 - EVAL BOARD FOR L6730XX
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Power - Output
-
Device description
Table 6.
5.11
Figure 21. Synchronization.
26/50
6.2K
4.3K
2.7K
1.8K
1.2K
11K
N.C
R1
0
Synchronization
The presence of many converters on the same board can generate beating frequency noise. To
avoid this it is important to make them operate at the same switching frequency. Moreover, a
phase shift between different modules helps to minimize the RMS current on the common input
capacitors.
devices can be synchronized simply connecting together the SYNCH pins. The device with the
higher switching frequency will be the Master while the other one will be the Slave. The Slave
controller will increase its switching frequency reducing the ramp amplitude proportionally and
then the modulator gain will be increased.
To avoid a huge variation of the modulator gain, the best way to synchronize two or more
devices is to make them work at the same switching frequency and, in any case, the switching
frequencies can differ for a maximum of 50% of the lowest one. If, during synchronization
between two (or more) L6730, it’s important to know in advance which the master is, it’s timely
to set its switching frequency at least 15% higher than the slave. Using an external clock signal
(f
(f
The phase shift between master and slaves is approximately done 180°.
EXT
SW
S/O/U pin; CC/O/U pin
) it is recommended to follow the below formula:
) to synchronize one or more devices that are working at a different switching frequency
Figure 21.
PWM SIGNALS
2.7K
2.7K
2.7K
2.7K
2.7K
2.7K
N.C
R2
0
shows the results of two modules in synchronization. Two or more
V
SOU
f
0.2
0.3
0.4
0.5
0.6
0.7
SW
/V
0
1
CCDR
f
EXT
1
3 ,
12V BUS
12V BUS
12V BUS
12V BUS
5V BUS
5V BUS
5V BUS
5V BUS
UVLO
f
SW
INDUCTOR CURRENTS
Not Latched
Not Latched
Not Latched
Not Latched
Latched
Latched
Latched
Latched
OVP
L6730C - L6730D
SINK CC
Not
Yes
Not
Yes
Not
Yes
Not
Yes