LV5027M-TLM-H ON Semiconductor, LV5027M-TLM-H Datasheet - Page 7

• Manufacturer Part Number: LV5027M-TLM-H
• Description: LED Lighting Drivers LED DRIVER IC
• Manufacturer: ON Semiconductor

Specifications of LV5027M-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）
flows into inductor is a triangular wave shown in the figure below. Make sure to set Ipk so that (average of inductor
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.
DutyI
VREF
(0.605Vtyp)
Ipk
Ipk
Rcs
Ipk
L
It is available to use both no-isolation and isolation applications.
The output current value is the average of the inductor current value that flows during one cycle. The current value that

a blockdiagram in outline


Vf


2
1
2
Vdc

2
VFET
CS

T



DutyI
Ipk
T
ILED
_
DutyI
(
+
-
ILED
DutyI
min
_
c
under drawing
L
Vac
 _
c
Vac2


T
T
CLK

RESET
T

DutyI
Vf

FET current
(primary side)
DutyI
_
d
T
TRIAC dimmer,OFF
Dummy load,ON(OUT2;high)
a blockdiagram in outline
Q
2

d
/ )

(1) since
ILED
T
,
T
DutyI

_
T
OUT
VREF


c
LED
T
Vac1
REF_IN
ILED
L



Vf
T
Vdc
L
Rcs
T
REF_IN
_
Vdc

,
Ipk 
d
T
min
T

_
_
min
(2)
DutyI
c
d

FET gate voltage
VREF
inductor
inductor current
current

Vf
Rcs
a blockdiagram in outline
DutyI
(3).


Ipk
2
LV5027M
T



Vf
ILED
FET_on
Vdc
T_c
T
Vdc

T_c T_d
Ipk: peak inductor current
Vf: LED forward voltage drop
Vdcmin: AC power-supply voltage
VREF: Built-in reference voltage (0.605V)
Rcs: External sense resistor
T
min

_
min
d
fosc

T_d
T(1cycle)
1
IL=（Vdcmin-Vf)/LxT
Vf
FET_off
T
(Rectified minimum DC voltage)

Vdc
(4)
IL=Vf/LxT
Vdc
(5)
(FET current=Vcs/Rcs)
min
min

Vf

Ipk(=VREF/Rcs)
ON
OFF
VREF(0.605Vtyp)

DutyI
Ipk=（Vdcmin-Vf)/LxT_c
=Vf/LxT_d

Vdcmin
2
PS No.A1950-7/12
(6)