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LC5910S Datasheet Preview

LC5910S Datasheet

LED Driver

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Critical Current Mode Buck LED Driver IC
LC5910S
Data Sheet
Description
LC5910S is the buck single-output LED driver IC that
achieves the LED drive with few components, high
efficiency, and high accuracy. The IC has various
protections and configures various LED circuits. The
PWM dimming and the three-level dimming (the
reference voltage selection function for LED current
limiting) are available.
Features
Converter Parts
Critical Current Mode (CRM) Control
(Low switching loss, low noise, reduction in the
number of components)
Enable Function
Bottom Detection Voltage 100 mV (typ.)
LED Control Parts
PWM Dimming Function
Reference Voltage Selection Function for LED
Current Limiting (three levels, 75% to 100%)
Current Reference Accuracy: ±1%
Protections
LED Output Short Circuit Protection: Pulse-by-pulse
Current Detection Short Circuit Protection: Auto-
restart
Input Voltage Drop Protection: Auto-restart
Overvoltage Protection (OVP): Auto-restart, fault
output
Thermal Shutdown (TSD) with Hysteresis: Auto-
restart
Package
SOP8
Not to scale
Specification
Recommended Supply Voltage: 12 V (min.) to 17 V
(max.)
Circuit Current at Standby: 100 μA (typ.)
Application
LED Back Light
LED Lighting Equipment
LED Bulbs
Typical Application
VIN
Fault Signal
PWM Signal
LED Current
Switch Signal
CIN
RBD1 CBD
RBD2
Q1
LED
DS
COUT
L1
VCC
CVCC
RCS
LC5910S -DSE Rev.2.2
SANKEN ELECTRIC CO., LTD
1
Mar.01, 2017
http://www.sanken-ele.co.jp
© SANKEN ELECTRIC CO., LTD. 2016




SANKEN

LC5910S Datasheet Preview

LC5910S Datasheet

LED Driver

No Preview Available !

LC5910S
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
1. Absolute Maximum Ratings----------------------------------------------------------------------------- 3
2. Recommended Operating Range----------------------------------------------------------------------- 3
3. Electrical Characteristics -------------------------------------------------------------------------------- 4
4. Block Diagram --------------------------------------------------------------------------------------------- 5
5. Pin Configuration Definitions--------------------------------------------------------------------------- 5
6. Typical Applications -------------------------------------------------------------------------------------- 6
7. Physical Dimension --------------------------------------------------------------------------------------- 7
8. Marking Diagram ----------------------------------------------------------------------------------------- 8
9. Operational Description --------------------------------------------------------------------------------- 9
9.1 Operation in Critical Current Mode (CRM)--------------------------------------------------- 9
9.2 Enable ------------------------------------------------------------------------------------------------- 9
9.3 Reference Voltage Select Function for LED Current Limit -------------------------------- 9
9.4 LED Current Setting ----------------------------------------------------------------------------- 10
9.5 Bottom Detection Function (Off-time Period Termination Detection)------------------ 10
9.6 Maximum On-time -------------------------------------------------------------------------------- 10
9.7 PWM Dimming ------------------------------------------------------------------------------------ 11
9.8 External Power MOSFET Gate Drive -------------------------------------------------------- 11
9.9 Overvoltage Protection (OVP) ------------------------------------------------------------------ 12
9.10 Fault Signal ----------------------------------------------------------------------------------------- 12
9.11 Thermal Shutdown (TSD) ----------------------------------------------------------------------- 12
10. Circuit Constant Setting ------------------------------------------------------------------------------- 13
10.1 Inductor Setting ----------------------------------------------------------------------------------- 13
10.2 Input Smoothing Electrolytic Capacitor, CIN, Setting-------------------------------------- 15
10.3 Output Smoothing Capacitor, COUT, Setting ------------------------------------------------- 15
10.4 Current Detection Resistor, RCS, Setting ----------------------------------------------------- 16
11. Design Notes ---------------------------------------------------------------------------------------------- 17
11.1 External Components ---------------------------------------------------------------------------- 17
11.1.1 Inductor --------------------------------------------------------------------------------------- 17
11.1.2 Input and Output Smoothing Electrolytic Capacitor -------------------------------- 17
11.1.3 Current Detection Resistor ---------------------------------------------------------------- 17
11.1.4 Freewheeling Diode ------------------------------------------------------------------------- 17
11.1.5 External Power MOSFET ----------------------------------------------------------------- 17
11.2 PCB Trace Layout -------------------------------------------------------------------------------- 18
12. PCB Pattern Layout ------------------------------------------------------------------------------------ 19
13. Reference Design of Power Supply ------------------------------------------------------------------ 20
14. Design Flow Chart -------------------------------------------------------------------------------------- 21
Important Notes---------------------------------------------------------------------------------------------- 22
LC5910S -DSE Rev.2.2
SANKEN ELECTRIC CO., LTD
2
Mar.01, 2017
http://www.sanken-ele.co.jp
© SANKEN ELECTRIC CO., LTD. 2016


Part Number LC5910S
Description LED Driver
Maker SANKEN
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LC5910S Datasheet PDF






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