IC CTRLR PWM 1PHASE SO-8

L6726A

Manufacturer Part NumberL6726A
DescriptionIC CTRLR PWM 1PHASE SO-8
ManufacturerSTMicroelectronics
TypeStep-Down (Buck)
L6726A datasheet
 


Specifications of L6726A

Internal Switch(s)NoSynchronous RectifierNo
Number Of Outputs1Voltage - OutputAdj to 0.8V
Frequency - Switching270kHzVoltage - Input1.5 ~ 12 V
Operating Temperature-20°C ~ 85°CMounting TypeSurface Mount
Package / Case8-SOIC (3.9mm Width)Output Current1.5 A
Input Voltage4.1 V to 13.2 VOperating Temperature Range- 40 C to + 150 C
Mounting StyleSMD/SMTFor Use With497-9046 - BOARD EVAL BASED ON L6726A497-6364 - BOARD DEMO FOR TS4995EIJT497-6259 - BOARD EVAL 1PH STPDN CONV L6726A
Lead Free Status / RoHS StatusLead free / RoHS CompliantCurrent - Output-
Power - Output-  
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L6726A
9
Application Information
9.1
Output inductor
Inductor value is defined by a compromise between dynamic response, ripple, efficiency,
cost and size. Usually, inductance is calculated to maintain inductor ripple current (ΔI
between 20% and 30% of maximum output current. Given the switching frequency (F
the input voltage (V
inductance can be calculated as follows:
V
V
V
IN
OUT
----------------------------- -
--------------
L
=
ΔI
F
SW
L
Figure 12
shows the ripple current vs. the output voltage for different inductance, with
V
= 5 V and V
IN
IN
Increasing inductance reduces inductor ripple current (and output voltage ripple
accordingly) but, at the same time, increases the converter response time to load transients.
Higher inductance means that the inductor needs more time to change its current from initial
to final value. Until the inductor has not finished its charging, the additional output current is
supplied by output capacitors. Minimizing the response time lead to minimize the output
capacitance required. If the compensation network is designed with high bandwidth, during
an heavy load transient the device is able to saturate duty cycle (0% or 80%). When this
condition is reached, the response time is limited only by the time required to charge the
inductor.
Figure 12. Inductor current ripple vs output voltage
12
]
[ A
10
l e
p
p
8
r i
t
n
e
6
r r
u
c
r
4
t o
c
u
d
2
I n
0
0
), the output voltage (V
IN
OUT
OUT
V
IN
= 12 V.
1
2
3
Ou tp u t vo ltag e [V ]
Doc ID 12754 Rev 4
Application Information
) and the desired ripple current (ΔI
Vin =1 2 V, L =1 u H
Vin =1 2 V, L =2 u H
Vin =5 V, L =5 0 0 n H
Vin =5 V, L =1 .5 u H
4
5
)
L
),
SW
),
L
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