LV5026M-TLM-H ON Semiconductor, LV5026M-TLM-H Datasheet - Page 12

• 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

VAC voltage is Low,
OUT2 is High voltage.
（for Isolation circuit）
[Inductance Lp of primary side and sense resistor Rs]
can be represented as:
∵
∴
To substitute the following to the formula below,
∴
Pin
Using the circuit diagram below, the wave form of the current that flows to Np and Ns is as follows.
Current waveform flows to primary side and secondary.
If a peak current flow to transformer is represented as Ipk_p, the power (Pin) charged to the transformer on primary side
(
a blockdiagram in outline
R1
Vz
R2
Ipk
Lp
∵
Don
Lp




_
REF_IN

CS
1
2
_
Vac
p
Vac
Pout

p
Pin

VREF
(0.605Vtyp)
Lp

2
Vac
under drawing
2
+
-
-
Lp

Ton


Ton
Ton
2
(

T
Ipk

2
CLK
RESET
_
Ton
(14)
Pin

_
TRIAC dimmer,OFF
Dummy load,ON(OUT2;high)
_
p
a blockdiagram in outline
_
Pout
p
p
Q

_
2
p
2

Ton
)
p

2
fosc
VF(VLED)
VACS(3Vtyp)

OUT
fosc
Vac
REF_IN
Lp
(Np)
_
fosc
p



(12)
Rcs

Vac
fosc
2
Ls
(Ns)


(11).
2
Vac
Pin
2

),
FET
Secondary

Primary
Don
(primary side current)
(Secondary side current)
2

Pout
Side
Ip
Is

fosc
Side
Don
_
.
LV5026M
Ipk_s
Ipk_p
p

2
fosc
2

(Ton_p)
(13)
FET_ON

a blockdiagram in outline
T(1cycle)
Ip=Vac/LpxTon_p
(Ton_s)
Vac
FET_OFF
(15)
REF_IN
Is current
(Secondary side current)
Ip(primary side)
Is=Vf/LsxTon_s
VREF(0.605V)typ
Ip is proportion to REF pin voltage
below VREF(0.605Vtyp)
ON
OFF
Ip slope is proportion to
Vac voltage(REF pin voltage)
T
T
Ipk_p=Vac/LpxTon_p
Ipk_s=Vf/LsxTon_s
PS No.A1950-12/18
Iout