L6725TR STMicroelectronics, L6725TR Datasheet - Page 19

IC CTRLR PWM ADJ STP DWN 16SOICN

L6725TR

Manufacturer Part Number
L6725TR
Description
IC CTRLR PWM ADJ STP DWN 16SOICN
Manufacturer
STMicroelectronics
Datasheet

Specifications of L6725TR

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
550kHz
Duty Cycle
100%
Voltage - Supply
4.5 V ~ 18 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 85°C
Package / Case
16-SOIC (3.9mm Width)
Frequency-max
550kHz
Output Voltage
0.6 V to 18 V
Output Current
30 A
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
For Use With
497-5867 - EVAL BOARD 20A 250KHZ L6725497-5500 - EVAL BOARD FOR L6725
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-5096-2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
L6725TR
Manufacturer:
ST
0
Part Number:
L6725TR
Manufacturer:
ST
Quantity:
20 000
Part Number:
L6725TR
Manufacturer:
ST
Quantity:
16 899
Company:
Part Number:
L6725TR
Quantity:
2 500
L6725 - L6725A
6.2
6.3
Output capacitors
The output capacitors are basic components for the fast transient response of the power supply.
For example, during a positive load transient, they supply the current to the load until the
converter reacts. The controller recognizes immediately the load transient and sets the duty
cycle at 100%, but the current slope is limited by the inductor value. The output voltage has a
first drop due to the current variation inside the capacitor (neglecting the effect of the ESL):
Moreover, there is an additional drop due to the effective capacitor discharge that is given by:
Where D
drop due to the ESR is the biggest one while the drop due to the capacitor discharge is almost
negligible. Moreover the ESR value also affects the voltage static ripple, that is:
Input capacitors
The input capacitors have to sustain the RMS current flowing through them, that is:
Where D is the duty cycle. The equation reaches its maximum value, I
losses in worst case are:
MAX
is the maximum duty cycle value that in the L6725 is 100%. Usually the voltage
Vout
COUT
=
Irms
2
P
Vout
Cout
=
=
ESR
ESR
Iout
Vout
(
Vin
=
0 (
,
=
Iout
5 .
Iout
min
D
ESR
Iout
2
1 ( D
D
ESR
∆ ⋅
L
)
max
2
I
L
)
(3)
(7)
Vout
(6)
(5)
)
(4)
OUT
/2 with D = 0.5. The
Application details
19/32

Related parts for L6725TR