L6728ATR STMicroelectronics, L6728ATR Datasheet - Page 15
L6728ATR
Manufacturer Part Number
L6728ATR
Description
IC CTLR PWM SGL HI FREQ 10VFQFPN
Manufacturer
STMicroelectronics
Datasheet
1.L6728ATR.pdf
(32 pages)
Specifications of L6728ATR
Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
660kHz
Duty Cycle
67%
Voltage - Supply
5 V ~ 12 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 125°C
Package / Case
10-DFN
Frequency-max
660kHz
Topology
Buck
Output Voltage
0.8 V
Output Current
1500 mA
Switching Frequency
660 KHz
Duty Cycle (max)
67 %
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
No
For Use With
497-8228 - BOARD EVALUATION W/L6728497-6418 - BOARD EVAL BASED ON L6728
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-8324-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L6728A
Figure 6.
●
●
To place the poles and zeroes of the compensation network, the following suggestions may
be followed:
Open loop converter singularities:
a)
b)
Compensation network singularities frequencies:
a)
b)
c)
d)
a)
Set the gain R
according to the approximated formula (suggested values for R
some kΩ):
F
F
F
F
F
F
----------
R
R
LC
ESR
Z1
Z2
P1
P2
FB
F
Example of type III compensation
=
=
=
=
=
=
compensation
converter gain
open loop
loop gain
=
EA gain
closed
------------------------------
2π R
---------------------------------------------------- -
2π
open loop
--------------------------------- -
2π L C
------------------------------------------------- -
2π R
------------------------------ -
2π R
F
------------
F
------------------------------------------- -
2π C
gain
0dB
LC
⋅
⋅
⋅
⋅
(
⋅
1
R
Gain
1
[dB]
0dB
F
⋅
1
F
S
⋅
FB
ΔV
------------------ -
OUT
⋅
⋅
⋅
F
C
1
⎛
⎝
C
V
OUT
1
1
/R
+
-------------------- -
C
C
OSC
F
IN
S
F
R
FB
F
⋅
+
ESR
S
⋅
) C
C
C
in order to obtain the desired closed loop regulator bandwidth
⋅
P
P
⎞
⎠
S
F
Z1
F
F
LC
Z2
F
F
ESR
P1
F
0dB
F
P2
20log (R
F
/R
20log (V
FB
Log (Freq)
)
IN
Application details
FB
/ΔV
OSC
is in the range of
)
15/32