Ordering number : ENA****
Bi-CMOS IC
LV5027M
LED Driver IC
Overview
LV5027M is a High Voltage LED drive controller which drives LED current up to 3A with external MOSFET.
LV5027M is realized very simple LED circuits with a few external parts.
Functions
High Voltage LED Controller
Low noise switching system
- 5 stages skip mode Frequency
- Soft driving
Built-in Reference voltage circuit (internal 0.605V)
Built-in circuit of detection of overvoltage of CS pin.
Short Protection Circuit
Specifications
Maximum Ratings at Ta = 25C
Parameter
Maximum Input voltage
Symbol
VIN max
CS pin
OUT pin
VOUT_abs
Allowable power dissipation
Pd max
Junction temperature
Tjmax
Operating temperature
Storage temperature
Conditions
With specified board*
Ratings
-0.3 to 42
Unit
V
-0.3 to 7
-0.3 to 42
V
V
1.0
W
150
C
Topr
-30 to +125
C
Tstg
-40 to +150
C
*Specified board: 58.0×54.0×1.6mm (glass epoxy board)
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer' s products or
equipment.
41311 SY 20110330-S00004 No.A1950-1/12
LV5027M
Recommended Operating Conditions at Ta = 25C
Parameter
Input voltage
Symbol
Conditions
Ratings
VIN
Unit
8.5 to 24
V
Electrical Characteristics at Ta 25C, VIN = 12V, unless otherwise specified.
Parameter
Symbol
Conditions
Ratings
min
typ
0.585
0.605
Unit
max
Reference Voltage block
Built-in Reference Voltage
VREF
VREF VIN line regulation
VREF_LN
VIN = 8.5 to 24V
0.625
±0.5
V
%
Under Voltage Lockout
Operation Start Input
Voltage
Operation Stop Input
Voltage
Hysteresis Voltage
UVLOON
UVLOOFF
8
9
10
V
6.3
7.3
8.3
V
UVLOH
1.7
V
Oscillation
Frequency
FOSC
Maximum ON duty
MAXDuty
40
50
93
VIO_VR
1
60
kHz
%
Comparator
Input offset Voltage
(Between CS and VREF)
Input current
IIOCS
10
160
IIOREF
mV
nA
80
nA
CS pin max voltage
VOM
1
malfunction prevention
mask time
Thermal protection Circuit
TMSK
Thermal shutdown
temperature
Thermal shutdown
hysteresis
Drive Circuit
TSD
TSD
OUT sink current
I OI
OUT source current
I OO
120
Minimum On time
TMIN
200
300
120
V
150
ns
*Design guarantee
165
C
*Design guarantee
30
C
1000
mA
500
mA
ns
VIN current
UVLO mode VIN current
ICCOFF
VINUVLOON
80
Normal mode VIN current
ICCON
VIN>UVLOON, OUT = OPEN
0.6
A
mA
VIN Over Voltage Protection Circuit
VIN over voltage protection
voltage
VIN Current at OVP
VINOVP
IINOVP
VIN=30V
24
27
30
V
0.7
1.0
1.5
mA
CS terminal abnormal sensing circuit
Abnormal sensing voltage
CSOCP
1.9
V
*: Design guarantee (value guaranteed by design and not tested before shipment)
No.A1950-2/12
LV5027M
TYPICAL CHARACTARISTICS
No.A1950-3/12
LV5027M
TYPICAL CHARACTARISTICS
TYPICAL CHARACTARISTICS
Block Diagram
VIN
Built-in
REGULATOR
TSD
0.605V
UVLO
OVP
REFERENCE
VOLTAGE
OSCILLATOR
CS
S
+
Q
CONTROL
LOGIC
R
-
OUT
Current Limit
Comparater
Short
Protection
Circuit
GND
Sample Application Circuit
Non isolation
Isolation
F1
F1
1m
AC
INPUT
1m
AC
INPUT
C2
D1
R4
C2
D1
D7
R4
L1
NP
D3
C13
NS
LED
D3
L
LV5027M
U1
VIN
ND
U1
LV5027M
VIN
R2
R2
Q1
OUT
Q1
OUT
CS
CS
R1
GND
R1
GND
R3
R3
No.A1950-4/12
LV5027M
Package Dimensions
unit: mm (typ)
3086B
Pin Assignment
NC
GND
NC
NC
NC
LV5027M
MFP10S
VIN
CS
OUT
NC
GND
Lp
(Np)
a blockdiagram in outline
Ls
(Ns)
(TOP VIEW)
Pin Functions
pin No
Pin Name
1
NC
R1
CLK
Q
Equivalent
Circuit
Pin Function
Vz
No connection
REF_IN
+
-
CS
2
3
NC
NC
No connection
OUT
RESET
VREF
(0.605Vtyp)
RT
Lp
(Np)
R2
No connection
Rcs
a blockdiagram in outline
4
CS
LED current sensing in. If this terminal voltage
exceeds VREF, external FET is OFF. And if the
voltage of the terminal exceeds 1.9V, LV5027M
turns to latch-off mode.
R1
CLK
Vz
+
-
CS
REF_IN
+
-
CS
VREF
(0.605Vtyp)
5
NC
GND
GND pin.
7
OUT
Driving the external FET Gate Pin.
8
VIN
Power supply pin.
Operation : VIN＞UVLOON
Stop: VIN＜UVLOOFF
Switching Stop : VIN>VINOVP
VCC
R1
Vz
1kΩ
No connection
10
GND
GND pin.
OUT
0.605V
（internal Voltage）
Lp
RT
(Np)
GND
Rcs
a blockdiagram in outline
6
NC
Q
RESET
R2
No connection
9
Ls
(Ns)
VIN
+
-
Ls
(Ns)
CLK VINQ
REF_IN
CS
+
VREF
(0.605Vtyp)
RESET
OUT
OUT
RTGND
R2
Rcs
VCC
VIN
1kΩ
+
-
OUT
GND
No.A1950-5/12
LV5027M
Relation ship beween VREF and CS pin voltage
The output current value is the average of the current value that flows during one cycle. The current value that flows into
coil is a triangular wave shown in the figure below. Make sure to set Ipk so that (average of current value at one cycle) is
a blockdiagrambetween
in outline VREF(internal reference voltage) voltage and Rcs
equal to (LED current value).Ipk is set by the relationship
voltage.
Vac2
Vac1
(FET current=Vcs/Rcs)
L
CLK
VREF
(0.605Vtyp)
+
Vac
LED current
OUT
Q
RESET a
blockdiagram in outline
REF_IN
CS
Vdcmin
FET current
(primary side)
REF_IN
VREF(0.605Vtyp)
Rcs
Ipk(=VREF/Rcs)
under drawing
T
FET gate voltage
ON
FET
OFF
Ton
TRIAC dimmer,OFF
Dummy load,ON(OUT2;high)
T
Ipk
VREF
Rcs
Ipk: peak inductor current
VIN: AC power-supply voltage (minimum value)
VREF: Built-in reference voltage (0.605V)
Rcs: External sense resistor
PS No.A1950-6/12
LV5027M
LED current and inductance setting
It is available to use both no-isolation and isolation applications.
（For non-isolation application）
a blockdiagram in outline
The output current
value is the average of the inductor current value that flows during one cycle. The current value that
Vac2
Vac1 wave shown in the figure below. Make sure to set Ipk so that (average of inductor
flows into inductor is a triangular
(FET current=Vcs/Rcs)
current
value at in
one
cycle) is equal to (LED current value).
a blockdiagram
outline
inductor current
LED
a blockdiagram in outline
REF_IN
L
Vac
Vdcmin
CLK
VREF
(0.605Vtyp)
+
FET current
Q side)
(primary
RESET
REF_IN
OUT
VREF(0.605Vtyp)
CS
Ipk(=VREF/Rcs)
under drawing
T
FET gate voltage
ON
Rcs
FET
OFF
TRIAC dimmer,OFF
T_c T_d
T
Dummy load,ON(OUT2;high)
Ipk
IL=（Vdcmin-Vf)/LxT
Ipk=（Vdcmin-Vf)/LxT_c
=Vf/LxT_d
IL=Vf/LxT
inductor
current
T_c
FET_on
T_d
FET_off
T(1cycle)
Given that the period when current flows into coil is
T _ c T _ d
,
DutyI
T
1
Ipk ( DutyI T ) / T ILED
2
VREF
2 ILED
(1) since Ipk
Ipk
DutyI
Rcs
VFET DutyI VREF
(2)
Rcs
Ipk
2 ILED
Ipk: peak inductor current
Vf: LED forward voltage drop
Vdcmin: AC power-supply voltage
(Rectified minimum DC voltage)
VREF: Built-in reference voltage (0.605V)
Rcs: External sense resistor
Since formula for LED current is different between on period and off period as shown above,
Vdc min Vf
Vf
T _ c
T _ d (3).
L
L
Since T _ c T _ d DutyI T , T _ c DutyI T T _ d
Vdc min Vf
Based on the result of (3) and (4), T _ d DutyI T
Vdc min
Ipk
(4)
(5)
To obtain L from the equation (1), (3), (5),
L
Vf DutyI
Vdc min Vf
Vf
1
Vdc min Vf
2
DutyI T
DutyI
2 ILED
Vdc min
2 ILED fosc
Vdc min
(6)
Since LED and inductor are connected in serial in non-isolation mode, LED current flows only when AC voltage exceed
VF.
PS No.A1950-7/12
de current)
LV5027M
（for Isolation application）
Using the circuit diagram below, the wave form of the current
that flows intooutline
NpIpand
Ns isto as
is proportion
REFfollows.
pin voltage
a blockdiagram
below VREF(0.605Vtyp)
Vac voltage
Current waveform flows to primaryLpside and secondary
(Np)
FET current
(primary side)
Ls
(Ns)
CLK
VREF
(0.605Vtyp)
+
Vdcmin
Q
OUT
RESET
VREF(0.605Vtyp)
Vac
CS
Ipk_p(=VREF/Rcs)
Toff
Rcs
FET gate voltage
ON
Ip(primary side)
OFF
VREF(0.605V)typ
Ton_p
T
T
Ls current
(Secondary side)
ON
OFF
t
Ton_s
Ipk_p=（Vdcmin)/LpxTon_p
Ipk_p
Primary
Side
Ip=（Vdcmin)/LpxTon_p
FET_ON
FET_OFF
(Ton_p)
T(1cycle)
Ipk_s=Vf/LsxTon_s
Ipk_s
Secondary
Side
Is=Vf/LsxTon_s
Iout
(Ton_s)
[Inductance Lp of primary side and sense resistor Rs]
If a peak current flow to transformer is represented as Ipk_p, the power (Pin) charged to the transformer on primary side
can be represented as:
1
Lp ( Ipk _ p)2 fosc (11).
2
Vdc min
∵Ipk _ p
(12)
Ton _ p
Lp
Vdc min 2 Ton _ p 2 fosc Vdc min 2 Don _ p 2
∴Lp
(13)
2 Pin
2 Pin fosc
Ton _ p
( Don _ p
Ton _ p fosc)
T
Pin
To substitute the following to the formula below,
Pout
(14)
Pin
Vdc min 2 Ton _ p 2 fosc Vdc min 2 Don 2
∴Lp
2 Pout
2 Pout fosc
∵
(15)
PS No.A1950-8/12
LV5027M
Sense resistor is obtained as follows.
Rs
VREF
VREF Lp
VREF Lp
Ipk _ p Vdc min Ton _ p Vdc min Don _ p T
(16)
[Inductance Ls of secondary side]
Since output current Iout is the average value of current flows to transformer of secondary side
Ton _ s
Ton _ s 1 Ipk _ s Don _ s
( Don _ s
Ton _ s fosc)
T
2
2
T
Vout
Vout Don _ s
(18)
Ipk _ s
Ton _ s
Ls
Ls
fosc
Vout T Don _ s 2 Vout Don _ s 2 Vout 2 Don _ s 2
(19)
Ls
2 Iout
2 Iout fosc
2 Pout fosc
Iout Ipk _ s
(17)
Calculation of the ratio of transformer coil on primary side and secondary side
Since ratio and inductance of transformer coil is
Ns
Np
Ls
Lp
(20)
substituted equations (15), (19) for (20)
∴
Np Vdc min
Don _ p
Ns
Vout
Don _ s
(21)
Calculation of transformer coil on primary side and secondary side
N
Vac 10 8
2 B Ae fosc
(22)
⊿B：variation range of core flux density [Gauss]
Ae：core section area [cm2]
To use Al (L value at 100T),
N
L
10 2
Al
(23)
L：inductance [uH]
Al: L value at 100T [uH/N2]
lg (Air gap) is obtained as follows:
lg
r 0 N 2 Ae 10 2
(24)
L
μr: relative magnetic permeability, μr＝1
μ0: vacuum magnetic permeability μ0＝4π*10-7
N: turn count [T]
Ae: core section area [m2]
L: inductance [H]
PS No.A1950-9/12
LV5027M
Description of operating protection function
tilte
outline
monitor point
note
1
UVLO
Under Voltage Lock Out
VIN voltage
2
OCP
Over Current Protection
CS voltage
3
OVP
Over Voltage Protection
VIN voltage
4
OTP
(TSD)
Over Temperature Protection
(Thermal Shut Down))
PN Junction temperature
equivalent FET current
1.UVLO(Under Voltage Lock Out)
If VIN voltage is 7.3V or lower, then UVLO operates and the IC stops. When UVLO operates, the power supply current
of the IC is about 80uA or lower. If VIN voltage is 9V or higher, then the IC starts switching operation.
VIN
voltage
B
UVLOON
(9Vtyp)
VCC
voltage
CSOFT*
A
UVLOOFF
tyop
(7.3Vtyp)
ＶＣＣ
ＧＮＤ
tyop
time
2dd
outputstage
on
off
VREG
(内部定電圧)
on
30k
30k
2.OCP(Over Current Protection)
The CS pin sense the current through the MOS FET switch and the primary side of the transformer.This provides an
additional level of protection in the event of a fault. If the voltage of the CS pin exceeds VCSOCP(1.9Vtyp)(A), the
iternal comparator will detect the event and turn off the MOSFET. The peak switch current is calculated
Io(peak) [A] = VSOCP[V]/Rsense[ohm]
The VIN pin is pulled down to fixed level, keeping the controller lached off.The lach reset occurs when the user
VCC
disconnects LED from VAC and lets the VIN falls below
voltage the VIN reset voltage,UVLOOFF(7.3Vtyp)(B). Then VIN rise
UVLOON(9Vtyp)(C),restart the switching.
CS
voltage
A
C
CSOCP(1.9Vtyp)
CSOFT*
time
VIN
voltage
ＶＣＣ
B
ＧＮＤ
OCP rerset
tyop
9Vtyp
7.3Vtyp
2dd
time
outputstage
30k
on
off
VREG
(内部定電圧)
30k
on
PS No.A1950-10/12
LV5027M
3.OVP(Over Voltage Protection)
If the voltage of VIN pin is higher than the internal reference voltage VINOVP(27Vtyp),switching operation is stopped.
The stopping operation is kept until the voltage of VIN is lower than 7.3V. If the voltage of VIN pin is higher than 9V, the
switching operation is restated.
VIN
voltage
A
B
OVP reset
OVP
C
operation start
27Vtyp
UVLOOFF
(7.3Vtyp)
9Vtyp
7.3Vtyp
time
tyop
outputstage
on
off
on
4.TSD(thermal Shut Down protection
The thermal shutdown function works when the junction temperature of IC is 165°C (typ) (A), and the IC switching
stops. The IC starts switching operation again when the junction temperature is 135°Ctyp (B) or lower.
Tj
(Junction Tmperature)
A
TSD(design target)
B
Time
outputstage
on
off
on
Skip frequency function
LV5027M contains the skip frequency function for reduction of the peak value of conduction noise. This function
changes the frequency as follows.
Switching frequency is changed as follows.
… 0.9 1.1 1.05 1 0.95 0.9 1.1 …
It’s repeated by this loop.
PS No.A1950-11/12
LV5027M
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using
products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
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without the prior written consent of SANYO Semiconductor Co.,Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of March, 2011. Specifications and information herein are subject
to change without notice.
PS No.A1950-12/12
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