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PDF RT7306 Data sheet ( Hoja de datos )
| Número de pieza | RT7306 | |
| Descripción | Primary-Side Regulation Dimmable LED Driver Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT7306 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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RT7306
Primary-Side Regulation Dimmable LED Driver Controller
with Active-PFC
General Description
The RT7306 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 RT7306 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.
RT7306 is compatible with analog dimming. The output
current can be modulated by the DIM pin. An in-house
design high voltage (HV) start-up device is integrated in
the RT7306 to minimize the power loss and shorten the
start-up time.
The RT7306 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 Analog Dimming
Built-in HV Start-up Device
Quasi-Resonant
Maximum/Minimum Switching Frequency
Clamping
Maximum/Minimum on-Time Limitation
Wide VDD Range (up to 34V)
THD Optimization
Input-Voltage Feed-Forward Compensation
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 Limitation
Applications
AC/DC LED Lighting Driver
Simplified Application Circuit
Flyback Application Circuit
Buck-Boost Application Circuit
Line
Neutral
BD
CIN
RHV
VDD HV
CVDD
GD
RT7306
TX1 DOUT
Q1
VOUT+
COUT
VOUT-
Line
Neutral
COMP
CCOMP
RPC
CS
Analog
Dimming
Signal
DIM
ZCD
GND
DAUX
RCS
RZCD1
RZCD2
BD
CIN
RHV
HV
VDD
CVDD
RT7306 GD
TX1
DOUT
Q1
VOUT-
COUT
VOUT+
COMP
CCOMP
CS
Analog
Dimming
Signal
DIM
ZCD
GND
DAUX
RPC
RCS
RZCD1
RZCD2
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS7306-02 January 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Valley
Signal
PWM
Valley
Signal
tSTART
PWM
Valley
Signal
tS(MIN)
PWM
Valley
Signal
tS(MIN)
PWM
tS(MIN)
5μs
Figure 4. PWM Triggered Method
HV Start-up Device
An in-house design 500V start-up device is integrated
in RT7306 to minimize the power loss and shorten the
start-up time. The HV start-up device will be turned on
during start-up period and be turned off during normal
operation. It provides fast start-up time and no power
loss in this path during normal operation. A 10k
resistor is recommended to be connected in series with
HV pin.
Dimming Function
An analog dimming function is embedded in RT7306.
When the voltage on the DIM pin (VDIM) is within
VDIM_LOW and VDIM_HIGH, the regulation factor of
constant current control (KCC) is linearly proportional to
VDIM, as shown in Figure 5.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS7306-02 January 2016
KCC (V)
KCC(MAX)
RT7306
0 VDIM_LOW VDIM_HIGH
VDIM (V)
Figure 5. Dimming Curve
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-circuit, the output voltage keeps rising,
causing the voltage on ZCD pin VZCD rising accordingly.
When the sample-and-hold ZCD voltage (VZCD_SH)
exceeds its OV threshold (VZCD_OVP, 3.2V 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.
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 1.7 typ.) of the output diode
short-circuit protection, RT7306 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)
RT7306 will be enabled when VDD voltage (VDD)
exceeds rising UVLO threshold (VTH_ON, 17V typ.) and
disabled when VDD is lower than falling UVLO
threshold (VTH_OFF, 8.5V typ.).
When VDD exceeds its over-voltage threshold (VOVP,
37.4V typ.), the PWM output of RT7306 is shut down. It
will be auto-restarted when the VDD is recovered to a
normal level.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
VDIM_LOW vs. Junction Temperature
400
380
360
340
320
-50
-25 0
25 50 75 100 125
Junction Temperature (°C)
VCOMP(MAX) vs. Junction Temperature
5.26
5.24
5.22
5.20
5.18
5.16
5.14
5.12
-50
-25 0 25 50 75 100 125
Junction Temperature (°C)
tLEB vs. Junction Temperature
500
480
460
440
420
400
-50
-25 0 25 50 75 100 125
Junction Temperature (°C)
RT7306
KCC vs. Junction Temperature
260
258
256
254
252
-50
-25 0 25 50 75 100 125
Junction Temperature (°C)
ICOMP(MAX) vs. Junction Temperature
140
120
100
80
60
40
20
0
-50 -25 0
25 50 75 100 125
Junction Temperature (°C)
1.850
VCS_SD vs. Junction Temperature
1.825
1.800
1.775
1.750
-50
-25 0 25 50 75 100 125
Junction Temperature (°C)
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS7306-02 January 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet RT7306.PDF ] | |
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