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RT7302 の電気的特性と機能

RT7302のメーカーはRichtekです、この部品の機能は「Primary-Side-Regulation Dimmable LED Driver Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 RT7302
部品説明 Primary-Side-Regulation Dimmable LED Driver Controller
メーカ Richtek
ロゴ Richtek ロゴ 




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RT7302 Datasheet, RT7302 PDF,ピン配置, 機能
®
RT7302
Primary-Side-Regulation Dimmable LED Driver Controller
with Active PFC
General Description
The RT7302 is a constant current LED driver with active
power factor correction. It supports high power factor
across a wide range of line voltages, and it drives the
converter in the Quasi-Resonant (QR) mode to achieve
higher efficiency. By using Primary Side Regulation (PSR),
the RT7302 controls the output current accurately without
a shunt regulator and an opto-coupler at the secondary
side, reducing the external component count, the cost,
and the volume of the driver board.
The RT7302 is designed to be compatible with PWM
Dimming. The output current can be modulated by the
duty ratio of the external PWM dimming signal.
An in-house design High Voltage (HV) start-up device is
integrated in the RT7302 to minimize the power loss and
shorten the start-up time.
The RT7302 embeds comprehensive protection functions
for robust designs, including LED open-circuit protection,
LED short-circuit protection, output diode short-circuit
protection, VDD Under-Voltage Lockout (UVLO), VDD
Over-Voltage Protection (VDD OVP), Over-Temperature
Protection (OTP), and cycle-by-cycle current limitation.
Features
Tight LED Current Regulation
No Opto-Coupler and TL431 Required
Power Factor Correction (PFC)
Compatible with PWM Dimming
Built-in HV Start-up Device
Quasi-Resonant
Maximum/Minimum Switching Frequency
Clamping
Input Voltage Feed-Forward Compensation
Maximum/Minimum On-Time Limitation
Wide VDD Voltage Range (up to 25V)
Multiple Protection Features
LED Open-Circuit Protection
LED Short-Circuit Protection
Output Diode Short-Circuit Protection
VDD Under-Voltage Lockout
VDD Over-Voltage Protection
Over-Temperature Protection
Cycle-by-Cycle Current Limit
RoHS Compliant and Halogen Free
Applications
AC/DC LED Lighting driver
Simplified Application Circuit
Flyback Converter
Buck-Boost Converter
Line
Neutral
BD
CSIN RM1 RHV
RT7302
HV
MULT
GD
RM2
CS
RPC
TX1
DOUT
VOUT+
COUT
VOUT-
Q1
COMP
RCS
CCOMP
GND
VDD
ZCD
DAUX
CVDD
RZCD1
RZCD2
Line
Neutral
BD
CSIN RM1 RHV
RT7302
HV
MULT
GD
RM2
CS
RPC
TX1
Q1
DOUT
VOUT-
COUT
VOUT+
COMP
RCS
CCOMP
GND
VDD
ZCD
DAUX
CVDD
RZCD1
RZCD2
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS7302-03 May 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

1 Page





RT7302 pdf, ピン配列
Function Block Diagram
RT7302
HV
ZCD
CS
Clamping
Circuit
Valley
Detector
VMULT
Feed-Forward
Compensation
Ramp
Generator
Starter
Circuit
Constant Current Control
ICS
L : Open
H : Closed
+
-
Constant On-Time
Comparator
Output Over
Voltage
Protection
VCS_CL
+
1V -
Current Limit
Comparator
HV Start-Up
Control
Under
Voltage
Lockout
(16V/9V)
PWM
Control
Logic
VDD OVP
VDD Over
Voltage
Protection
PWM
VCLAMP 13V
Gate
Driver
RGD
Leading
Edge
Blanking
Dimming
VMULT
Comparator
+
VMULT_EN / VMULT_DS -
150mV / 100mV
Output Diode
Short Circuit
Protection
Over
Temperature
Protection
OTP
Output OVP
VDD
GD
GND
MULT
COMP
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS7302-03 May 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3


3Pages


RT7302 電子部品, 半導体
RT7302
which is the non-inverting input of the constant on-time
comparator. This function reduces the operating COMP
voltage range over full line input voltage range and extends
the range of the allowed magnetize inductance.
PWM Dimming Function
PWM dimmable function is embedded in the RT7302.
When the MULT voltage (VMULT) < VMULT_DIS, the COMP
pin will become high impedance and the regulation loop
operates according to the voltage (VCOMP). The loop will
keep operation with the previous condition. When VMULT
> VMULT_EN, the internal amplifier resumes controlling the
VCOMP for the regulation loop to provide the constant output
current. Thus, the average output current is linearly
proportional to the duty ratio of the PWM dimming signal
Protections
LED Open-Circuit Protection
In an event of output open circuit, the converter will be
shut down to prevent being damaged, and it will be auto-
restarted when the output is recovered. Once the LED is
open, the output voltage and VZCD will rise. When the
sample-and-hold ZCD voltage (VZCD_SH) exceeds its OV
threshold (VZCD_OVP, 3.1V typ.), output OVP will be
activated and the PWM output (GD pin) will be forced low
to turn off the main switch.
If the output is still open-circuit when the converter restarts,
the converter will be shut down again.
LED Short-Circuit Protection
LED short-circuit protection can be achieved by VDD UVLO
and cycle-by-cycle current limitation. Once LED short-
circuit failure occurs, VDD drops related to the output
voltage. When the VDD is lower than falling UVLO threshold
(VTH_OFF, 9V typ.), the converter will be shut down and it
will be auto-restarted when the output is recovered.
Output Diode Short-Circuit Protection
When the output diode is damaged as short-circuit, the
transformer will be led to magnetic saturation and the main
switch will suffer from a high current stress. To avoid the
above situation, an output diode short-circuit protection
is built-in. When CS voltage VCS exceeds the threshold
(VCS_SD 1.5 typ.) of the output diode short-circuit protection,
the RT7302 will shut down the PWM output (GD pin) in
few cycles to prevent the converter from damage. It will
be auto-restarted when the failure condition is recovered.
VDD Under-Voltage Lockout (UVLO) and
Over-Voltage Protection(VDD OVP)
The RT7302 will be enabled when VDD voltage (VDD)
exceeds rising UVLO threshold (VTH_ON, 16V typ.) and
disabled when VDD is lower than falling UVLO threshold
(VTH_OFF, 9V typ.).
When VDD exceeds its over-voltage threshold (VOVP, 27V
typ.), the PWM output of the RT7302 is shut down. It will
be auto-restarted when the VDD is recovered to a normal
level.
Over-Temperature Protection (OTP)
The RT7302 provides an internal OTP function to protect
the controller itself from suffering thermal stress and
permanent damage. It's not suggested to use the function
as precise control of over temperature. Once the junction
temperature is higher than the OTP threshold (TSD, 150°C
typ.), the controller will shut down until the temperature
cools down by 30°C (typ.). Meanwhile, if VDD reaches falling
UVLO threshold voltage (VTH_OFF), the controller will
hiccup till the over-temperature condition is removed.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
6
is a registered trademark of Richtek Technology Corporation.
DS7302-03 May 2015

6 Page



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共有リンク

Link :


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