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LC5545LD Datasheet Preview

LC5545LD Datasheet

LED Driver

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No Input Electrolytic Capacitor Required, IEC61000-3-2 Class-C
Isolated LED Driver IC
LC5540LD Series
Data Sheet
Description
The LC5540LD series are isolated LED drivers in
which a power MOSFET and a control IC are highly
integrated.
The IC provides the systems that can comply with the
harmonics standard (IEC61000-3-2 Class C) in all
conditions, including a light load condition. These
systems, moreover, can be achieved without an input
electrolytic capacitor.
The IC employs the average current and quasi-resonant
controls: the average current control realizes high power
factors, whereas the quasi-resonant control contributes to
high efficiency and low noise.
Having a rich set of protection features, the IC can
provide and more cost-effective power supply systems
with fewer external components.
Features
Built-in On-time Control Circuit
(High Power Factor Achieved by Average Current
Control)
Built-in Startup Circuit
(Reduced Numnber of External Components)
Soft Start Function
(Startup Stress Reduction for Power MOSFET and
Secondary Rectifier Diode)
Bias Assist Function
(Improved Startup Performance, VCC Voltage Drop
Suppresion in Operation, Reduced Capacitance of
VCC Pin Capacitor)
Leading Edge Blanking Function
Built-in Maximum On-time Limitation Function
Protections Include:
Overcurrent Protection (OCP): Pulse-by-Pulse
Overvoltage Protection (OVP): Latched Shutdown
Overload Protection (OLP): Latched Shutdown
Thermal Shutdown (TSD): Latched Shutdown
Package
DIP8
Selection Guide
Electrical Characteristics
Part Number VDSS (min.) fOSC (typ.)
LC5545LD
LC5546LD
650 V
72 kHz
60 kHz
Not to scale
tON(MAX)
(typ.)
9.3 µs
11.2 µs
Power MOSFET On-resistance and Output Power
Part Number
RDS(ON)
(max.)
230 VAC
POUT*
85 VAC to
265 VAC
LC5545LD 3.95 Ω
13 W
10 W
LC5546LD 1.9 Ω
20 W
16 W
* Based on the thermal ratings; the allowable maximum output
powers can be up to 120% to 140% of the rated values.
However, the maximum output powers may be limited in an
application with a low output voltage or according to a
maximum duty cycle for designing a transformer.
Applications
LED Lighting Equipment
LED Bulbs
LC5540LD-DSE Rev.2.0
SANKEN ELECTRIC CO., LTD.
1
Mar. 05, 2020
https://www.sanken-ele.co.jp/en/
© SANKEN ELECTRIC CO., LTD. 2011




SANKEN

LC5545LD Datasheet Preview

LC5545LD Datasheet

LED Driver

No Preview Available !

LC5540LD Series
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3
2. Electrical Characteristics -------------------------------------------------------------------------------- 4
2.1. Electrical Characteristics of Control Parts----------------------------------------------------- 4
2.2. Electrical Characteristics of Power MOSFET------------------------------------------------- 5
3. Block Diagram --------------------------------------------------------------------------------------------- 6
4. Pin Configuration Definitions--------------------------------------------------------------------------- 6
5. Typical Application --------------------------------------------------------------------------------------- 7
6. Physical Dimensions -------------------------------------------------------------------------------------- 8
7. Marking Diagram ----------------------------------------------------------------------------------------- 8
8. Operational Description --------------------------------------------------------------------------------- 9
8.1. Startup Operation----------------------------------------------------------------------------------- 9
8.1.1. Startup Time ----------------------------------------------------------------------------------- 9
8.1.2. Undervoltage Lockout (UVLO) ------------------------------------------------------------ 9
8.1.3. Bias Assist Function--------------------------------------------------------------------------- 9
8.1.4. Auxiliary Winding -------------------------------------------------------------------------- 10
8.1.5. Soft Start Function -------------------------------------------------------------------------- 11
8.1.6. Operation Mode at Startup---------------------------------------------------------------- 11
8.2. On-time Control Operation --------------------------------------------------------------------- 12
8.3. Quasi-resonant Operation and Bottom-on Timing ----------------------------------------- 13
8.3.1. Quasi-resonant Operation ----------------------------------------------------------------- 13
8.3.2. Bottom-on Timing Setup ------------------------------------------------------------------- 13
8.3.3. BD Blanking Time--------------------------------------------------------------------------- 16
8.4. Overvoltage Protection (OVP) ------------------------------------------------------------------ 16
8.4.1. VCC Pin Overvoltage Protection (VCC_OVP)---------------------------------------- 16
8.4.2. OCP Pin Overvoltage Protection (OCP_OVP) ---------------------------------------- 17
8.4.3. OVP Pin Overvoltage Protection (OVP_OVP) ---------------------------------------- 17
8.5. Overload Protection (OLP)---------------------------------------------------------------------- 17
8.6. Overcurrent Protection (OCP) ----------------------------------------------------------------- 18
8.6.1. OCP Detection Method and Leading Edge Blanking Function -------------------- 18
8.6.2. Input Compensation Function ------------------------------------------------------------ 19
8.6.3. OCP Threshold Voltage with or without Compensation Circuit ------------------ 20
8.6.4. Determining OCP Input Compensation Circuit Component Values ------------- 21
8.6.5. Reference Design for OCP Input Compensation Circuit with Universal Input- 21
8.7. Thermal Shutdown (TSD) ----------------------------------------------------------------------- 22
8.8. Maximum On-time Limitation Function ----------------------------------------------------- 23
9. Design Notes ---------------------------------------------------------------------------------------------- 24
9.1. External Components ---------------------------------------------------------------------------- 24
9.2. Transformer Design ------------------------------------------------------------------------------ 24
9.3. Trace and Component Layout Design -------------------------------------------------------- 26
Important Notes---------------------------------------------------------------------------------------------- 28
LC5540LD-DSE Rev.2.0
SANKEN ELECTRIC CO., LTD.
2
Mar. 05, 2020
https://www.sanken-ele.co.jp/en/
© SANKEN ELECTRIC CO., LTD. 2011


Part Number LC5545LD
Description LED Driver
Maker SANKEN
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LC5545LD Datasheet PDF






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