LED Driver. MG39U302 Datasheet

MG39U302 Driver. Datasheet pdf. Equivalent


Megawin MG39U302
(Preliminary) MG39U302
Switching Type LED Driver with Average-Mode Constant Current Control
Contents
1 Features.......................................................................................................... 2
2 Description ...................................................................................................... 2
3 Order Information ............................................................................................ 2
4 Application Field.............................................................................................. 2
5 Pin Description ................................................................................................ 3
5.1 Pin Definition .................................................................................................................... 3
5.2 Pin Configuration.............................................................................................................. 3
6 Block Diagram................................................................................................. 4
7 Application Circuit ........................................................................................... 4
8 Absolute Maximum Rating .............................................................................. 5
9 Electrical Characteristics................................................................................. 5
10 Package Dimension ........................................................................................ 7
10.1 SOP8 Package Dimension............................................................................................... 7
10.2 SOP16 Package Dimension............................................................................................. 8
11 Revision History .............................................................................................. 9
This document contains information on a new product under development by Megawin. Megawin reserves the right to change or
discontinue this product without notice.
© Megawin Technology Co., Ltd. 2012 All rights reserved.
2012/10 version 1.02


MG39U302 Datasheet
Recommendation MG39U302 Datasheet
Part MG39U302
Description Switching Type LED Driver
Feature MG39U302; (Preliminary) MG39U302 Switching Type LED Driver with Average-Mode Constant Current Control Contents.
Manufacture Megawin
Datasheet
Download MG39U302 Datasheet




Megawin MG39U302
1 Features
z Operation voltage, 8.0V ~ 500V
z Fast average current control
z Programmable constant off-time switching
z Output short circuit protection with skip mode
z Linear and PWM dimming input
z Ambient operating temperature: -40°C to+125°C
z Pin-to-pin compatible with the MG39U301
2 Description
The MG39U302 is an average current mode control LED driver IC operating in a constant off-time mode. Unlike
MG39U301, this control IC does not produce a peak-to-average error, and therefore greatly improves accuracy,
line and load regulation of the LED current without any need for loop compensation or high-side current sensing.
The output LED current accuracy is ±3%.
The MG39U302 is equipped with a current limit comparator for hiccup mode output short circuit protection.
The MG39U302 can be powered from an 8.0V ~ 500V supply. A PWM dimming input is provided that accepts an
external control TTL compatible signal. The output current can be programmed by an internal 272mV reference,
or controlled externally through a 0 ~ 1.5V dimming input.
MG39U302 is pin-to-pin compatible with MG39U301 and it can be used as a drop-in replacement for many
applications to improve the LED current accuracy and regulation.
The chip is available in 8-pin or 16-pin SOP package.
3 Order Information
Package
MG39U302ASC1
SOP8
MG39U302ASC2
SOP16
4 Application Field
DC-DC or AC-DC LED driver applications
Backlight driver for LCD displays
General-purpose constant current source
LED signage and displays
Architectural and decorative LED lighting
LED street lighting
2
MG39U302 Data Sheet
MEGAWIN



Megawin MG39U302
5 Pin Description
5.1 Pin Definition
SOP8 SOP16
11
Pin Name
VIN
24
CS
35
GND
4 8 GATE
59
PWM
6 12
VDD
7 13
LD
8 14
2, 3,
-
6, 7,
10, 11,
15, 16
RT
NC
Description
8.0V~500V linear regulator input.
The current sense input pin used to sense the FET current by means of
an external sense resistor.
Ground pin. Ground return for all internal circuitry. This pin must be
electrically connected to the ground of the power train.
This pin is the output GATE driver for an external N-channel power
MOSFET.
This is the PWM dimming input of the IC. When this pin is pulled to GND,
the gate driver is turned off. When the pin is pulled high, the gate driver
operates normally.
This is the power supply pin for all internal circuits. It must be bypassed
with a low ESR capacitor to GND (at least 0.1μF).
This pin is the linear dimming input, and it sets the current sense
threshold as long as the voltage at this pin is less than 1.5V. If voltage at
LD falls below 150mV, the GATE output is disabled. The GATE signal
recovers at 200mV at LD.
A resistor connected between this pin and GND programs the GATE off-
time.
No connection.
5.2 Pin Configuration
1
VIN
2
CS
3
GND
4
GATE
8-pin SOP with
Thermal Pad
8
RT
7
LD
6 VDD
5
PWM
1
VIN
2
NC
3
NC
4
CS
5
GND
6
NC
7
NC
8
GATE
16
NC
15
NC
14
RT
13
LD
12
VDD
11 NC
10
NC
9
PWM
16-pin SOP with
Thermal Pad
MEGAWIN
MG39U302 Data Sheet
3







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