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PDF RT7737 Data sheet ( Hoja de datos )
| Número de pieza | RT7737 | |
| Descripción | Programmable Burst Switching Green Mode/Burst Mode Level Flyback Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT7737 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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RT7737
Programmable Burst Switching Green Mode/Burst Mode
Level Flyback Controller
General Description
The RT7737 series are enhanced high efficient PWM
flyback controller with proprietary SmartJitterTM
technology. The innovative SmartJitterTM technology
not only reduces the EMI emissions of SMPS when the
system enters burst switching green mode, but also
eliminates the output jittering ripple. Also, the RT7737
series feature programmable burst switching green
mode and burst mode level for adopting different
application requirements to optimize the product
performance. To meet the stringent trend toward
performance, the RT7737 series are the best choice for
product designers.
The RT7737 is available in SOT-23-6 package. It is a
current mode PWM controller providing comprehensive
protection functions, including an input Under-Voltage
Lockout (UVLO), a VDD Over-Voltage Protection
(OVP), an Over-Load Protection (OLP), a Secondary
Rectifier Sort Protection (SRSP), a CS pin open
protection and a cycle-by-cycle current limit. With the
above features, the RT7737 is a cost-effective and
compact solution for AC/DC products.
Features
Proprietary SmartJitterTM Technology
Reducing EMI Emissions of SMPS
Output Jittering Ripple Elimination
Programmable Burst Switching Green Mode
Level
Programmable Burst Mode Level
Accurate Over Load Protection
Driver Capability : 200mA/300mA
High Noise Immunity
Applications
Switching AC/DC Adaptor
DVD Open Frame Power Supply
Set-Top Box (STB)
ATX Standby Power
TV/Monitor Standby Power
PC Peripherals
NB Adaptor
Simplified Application Circuit
Mains
(90V to 265V)
Vo+
Vo-
VDD
BURST
GATE
RBS
COMP RT7737
RCS_RC
CS
GND
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7737-00 September 2014
is a registered trademark of Richtek Technology Corporation
www.richtek.com
1
1 page  
RT7737
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VDD to GND------------------------------------------------------------------------------- 0.3V to 30V
GATE to GND ---------------------------------------------------------------------------------------------------------- 0.3V to 16.5V
BURST, COMP, CS to GND---------------------------------------------------------------------------------------- 0.3V to 6.5V
Power Dissipation, PD @ TA = 25C
SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.38W
Package Thermal Resistance (Note 2)
SOT-23-6, θJA---------------------------------------------------------------------------------------------------------- 260.7C/W
Junction Temperature ------------------------------------------------------------------------------------------------ 150C
Lead Temperature (Soldering, 10 sec.)-------------------------------------------------------------------------- 260C
Storage Temperature Range --------------------------------------------------------------------------------------- 65C to 150C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------- 2.5kV
MM (Machine Model) ------------------------------------------------------------------------------------------------- 250V
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VDD------------------------------------------------------------------------------------------- 12V to 25V
Recommended Resistance on the BURST Pin ----------------------------------------------------------------- 10k to 60k
Junction Temperature Range---------------------------------------------------------------------------------------- 40C to 125C
Ambient Temperature Range---------------------------------------------------------------------------------------- 40C to 85C
Electrical Characteristics
(VDD = 15V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
VDD Section
VDD Over-Voltage Protection
Level
VOVP
VDD Zener Clamp
VZ
On Threshold Voltage
VTH_ON
RT7737G/L/H
RT7737A
Off Threshold Voltage
VTH_OFF
VDD Holdup Mode Entry Point VDD_ET VCOMP < 1.3V
VDD Holdup Mode Ending
Point
VDD_ED VCOMP < 1.3V
Latch-off Clamping Voltage VDD_LH
Threshold Voltage for Latch-off
Release
VLH_OFF
Min Typ Max Unit
26 27 28
29
12.5
14.5
8.5
9.5
--
13.5
15.5
9
10
--
14.5
16.5
9.5
10.5
10 10.5 11
-- 6 --
-- 5.5 --
V
V
V
V
V
V
V
V
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7737-00 September 2014
is a registered trademark of Richtek Technology Corporation
www.richtek.com
5
5 Page 
RT7737
101.0
100.5
fOSC vs. VDD
RT7737H
100.0
99.5
99.0
10 12.5 15 17.5 20 22.5 25
VDD (V)
fBS_MIN vs. Temperature
26
RT7737G/L/A
24
22
20
18
-50
-25
0 25 50 75
Temperature (°C)
100 125
VCOMP_OP vs. Temperature
5.6
5.4
5.2
5.0
4.8
-50
-25
0 25 50 75
Temperature (°C)
100 125
fOSC vs. Temperature
106
RT7737H
102
98
94
90
-50
-25
0 25 50 75
Temperature (°C)
100 125
fBS_MIN vs. Temperature
28
RT7737H
26
24
22
20
-50
-25
0 25 50 75
Temperature (°C)
100 125
IZERO vs. Temperature
320
300
280
260
240
-50
-25
0 25 50 75
Temperature (°C)
100 125
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7737-00 September 2014
is a registered trademark of Richtek Technology Corporation
www.richtek.com
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet RT7737.PDF ] | |
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