PDF《NCL30388 Power Factor Corrected》

? Semiconductor Components Industries, LLC,

2018 December,

2018 ? Rev.

0 1 Publication Order Number: NCL30388/D NCL30388 Power Factor Corrected LED Driver Featuring Primary Side CC / CV Control The NCL30388 is a power factor corrected controller targeting isolated and non?isolated constant current LED drivers. Designed to support flyback, buck?boost and SEPIC topologies, the controller operates in a quasi?resonant mode to provide high efficiency. Due to a novel control method, the device is able to tightly regulate a constant LED current from the primary side and provides near?unity power factor. This removes the need for secondary side feedback circuitry, its biasing and for an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. This device is specifically intended for very compact space efficient designs and also provides a constant voltage regulation of the output if no load is connected to the LED driver. Features ? High Voltage Startup ? Quasi?resonant Peak Current?mode Control Operation ? Primary Side Feedback ? CC / CV Control ? Tight LED Constant Current Regulation of ±2% Typical ? Digital Power Factor Correction ? Cycle by Cycle Peak Current Limit ? Wide Operating VCC Range ? ?40 to + 125°C ? Robust Protection Features ? Brown?Out ? OVP on VCC ? Constant Voltage / LED Open Circuit Protection ? Winding Short Circuit Protection ? Secondary Diode Short Protection ? Output Short Circuit Protection ? Thermal Shutdown Typical Applications ? Integral LED Bulbs ? LED Power Driver Supplies ? LED Light Engines SOIC?7 CASE 751U See detailed ordering and shipping information on page

15 of this data sheet. ORDERING INFORMATION MARKING DIAGRAM www.onsemi.com L30388 = Specific Device Code x = Version A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb?Free Package PIN CONNECTIONS L30388x ALYWX G

1 8 COMP ZCD CS GND HV

1 2

3 4

5 6

8 NCL30388 www.onsemi.com

2 Figure 1. Typical Application Schematic in a Flyback Converter . . . NCL30388

1 2

3 4

5 8

6 PIN FUNCTION DESCRIPTION NCL30388 Pin No Pin Name Function Pin Description

1 COMP OTA output for CV loop This pin receives a compensation network to stabilize the CV loop

2 ZCD Zero crossing Detection Vaux sensing This pin connects to the auxiliary winding and is used to detect the core reset event. This pin also senses the auxiliary winding voltage for accurate out- put voltage control

3 CS Current sense This pin monitors the primary peak current.

4 GND ? The controller ground

5 DRV Driver output The driver'

s output to an external MOSFET

6 VCC Supplies the controller This pin is connected to an external auxiliary voltage.

8 HV High Voltage sensing This pin connects after the diode bridge to provide the startup cur- rent and internal high voltage sensing function. NCL30388 www.onsemi.com

3 INTERNAL CIRCUIT ARCHITECTURE Figure 2. Internal Circuit Architecture NCL30388 COM P ZCD Zero Crossing Detection Logic (ZCD Blanking , Time?Out, ...) ValleySelection CS Constant-C urrent Control Leading Edge Blanking W inding and Output diode Short Circuit Protection Max. Peak Current Limit Ipkmax W OD_SCP Qdrv VCC Management VCC DRV VCC Ov er Voltage Protection VCC Internal Thermal Shutdown Fault Management Clamp Circuit HV Brown?Out BO_NOK S R Q Q CS_reset STOP UVLO OFF Latch STOP W OD_SCP Ipkmax BO_NOK GND STOP Qdrv Aux. W inding Short Circuit Prot. Aux_SCP Aux_SCP VCC_max FF_mode V Line feed-fo rw ard HVdiv Enable VHVdiv Ipkmax VCV VCV VREF VDD VREF VHVdiv VREF(PFC) VVLY Enable CS Short Protection CS_shorted CS_shorted Generation of the Reference Voltage for Power Factor Corr. VREF(PFC) FrequencyFoldback FF_mode Constant Voltage Control HV STUP VHVdiv VREF setpoint VREF NCL30388 www.onsemi.com