LV5026M-TLM-H ON Semiconductor, LV5026M-TLM-H Datasheet - Page 10

• Manufacturer Part Number: LV5026M-TLM-H
• Description: LED Lighting Drivers LED DRIVER IC
• Manufacturer: ON Semiconductor

Specifications of LV5026M-TLM-H

• Rohs: yes
• Input Voltage: - 0.3 V to + 42 V
• Maximum Supply Current: 3 A
• Maximum Operating Temperature: + 125 C
• Package / Case: MFP-10S
• Minimum Operating Temperature: - 30 C
• Power Dissipation: 1 W

LED current and inductance setting
（For non-isolation application）
into coil is a triangular wave shown in the figure below. Make sure to set IL_PK so that (average of current value at one
cycle) is equal to (LED current value).
Given that the period when current flows into coil is
,
Since formula for LED current is different between on period and off period as shown above,
Since
Based on the result of (3) and (4),
To obtain L from the equation (1), (3), (5),
Since LED and inductor are connected in serial in non-isolation mode, LED current flows only when AC voltage exceed
VF.
Ipk
Ipk
Rcs
Ipk
L
It is available to use both no-isolation and isolation applications.
DutyI
a blockdiagram in outline
R1
Vz
R2
The output current value is the average of the current value that flows during one cycle. The current value that flows


Vf



2
1
2
Vac
REF_IN
2
VFEF
T

CS




DutyI
ILED
_
DutyI
(
T
ILED
L
DutyI
VREF
(0.605Vtyp)
Ipk

c
_
 _
Vf
+
-
-
_
c
T
under drawing
T

IN



T
CLK
T
DutyI
RESET
d
T

_
_
/ )

(1) since
d
DutyI
c
Q
a blockdiagram in outline
T
DutyI



Vf
T
L
Vac
ILED
OUT
2


LED


ILED
VREF
T
L
REF_IN
Vac
T
T
_
Vac
_
,
Ipk
Rcs
d
T
d


Vf
Ip is proportion to REF pin voltage
below VREF(0.605Vtyp)
_
_

c
DutyI
IN
VREF
(3).


DutyI
2
inductor
current
Rcs
FET
inductor current


Vf
ILED
LV5026M
_
T
(2)
Ipk
IN


Vac
T


Vac
FET_on
T_c
T

fosc
1
Vf
_
d
a blockdiagram in outline
Ipk: peak inductor current
Vf: LED forward voltage drop
Vac: effective value(R.M.S value)
VREF: Built-in reference voltage (0.605V)
VREF_IN:REF_IN voltage(6 pin)
Rs: External sense resistor
Vzd:Zener diode voltage(REF_IN pin)

Vac
T_d
T(1cycle)
(5)
Vac
FET_off
(4)

IL=Vac/LxT
Vf
Vac
IL=Vf/LxT

REF_IN

DutyI
VREF(0.605Vtyp)/built-in reference
ILED slope is proportion to
Vac voltage(REF pin voltage)
ON
OFF

T
2
Ip(FET current)/
primary side
(6)
Ipk=(Vac-Vf)/LxT_c
PS No.A1950-10/18
=Vf/LxT_d