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PDF RT7738 Data sheet ( Hoja de datos )
| Número de pieza | RT7738 | |
| Descripción | Multi-Mode Flyback Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT7738 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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RT7738
SmartJitterTM Multi-Mode Flyback Controller
General Description
The RT7738 series are enhanced high efficient
multi-mode PWM flyback controller with proprietary
SmartJitterTM technology. The innovative SmartJitterTM
technology can not only reduces the EMI emissions of
SMPS when the system enters green mode, but also
eliminates the output jittering ripple. Also, the RT7738
series feature Continuous Conduction Mode (CCM)
and valley switching multi-mode control to optimize the
product performance. To meet the stringent trend
toward performance in recent years, the RT7738 series
are the best choice for product designers.
The RT7738 is available in SOT-23-6 package, and it is a
current mode PWM controller. Comprehensive protection
and programmable functions are built-in, including a
programmable propagation delay time compensation, a
programmable output Over-Voltage Protection (OVP), a
programmable external Over-Temperature Protection
(OTP), and a programmable bulk capacitor Brown-in/
Brown-out protection. With the above features, the
RT7738 is a cost-effective and compact solution for
AC/DC products.
Features
Proprietary SmartJitterTM Technology
Reducing EMI Emissions of SMPS
Output Jittering Ripple Elimination
Continuous Conduction Mode (CCM) and Valley
Switching Mode Control
Ultra-low Start-up current (<3A)
Accurate Over-Load Protection (OLP)
Programmable Propagation Delay Time
Compensation
Programmable Output Over-Voltage Protection
Programmable External Over-Temperature
Protection
Programmable Bulk Capacitor Brown-in/Brown-out
Protection
Driver Capability : 200mA/300mA
High Noise Immunity
Applications
Switching AC/DC Adaptor
NB Adaptor
TV/Monitor Standby Power
PC Peripherals
Simplified Application Circuit
Mains
(90V to 265V)
CCOMP
VDD
DMAG
GATE
COMP RT7738
GND
CS
(Optional)
(Optional)
(Optional)
(Optional)
VO+
VO-
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7738-00 November 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT7738
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VDD to GND------------------------------------------------------------------------------- 0.3V to 30V
GATE to GND ---------------------------------------------------------------------------------------------------------- 0.3V to 16.5V
DMAG, 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
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
On Threshold Voltage
VTH_ON
RT7738G/L/H
RT7738A
Off Threshold Voltage
VTH_OFF
VDD Holdup Mode Entry Point VDD_ET
VCOMP < 0.85V
VDD Holdup Mode Ending
Point
VDD_ED
VCOMP < 0.85V
Latch-off Clamping Voltage VDD_LH
RT7738L/A
Threshold Voltage for Latch-off
Release
VLH_OFF
RT7738L/A
Start-up Current
IDD_ST
Latch-off Operating Current IDD_LH
VDD < VTH_ON 0.1V,
TA = 40C to 85C
TA = 40C to 85C
RT7738L
RT7738A
Min Typ Max Unit
26 27 28
13.5 14.5 15.5
15 16 17
8.5 9 9.5
9.5 10 10.5
10 10.5 11
-- 5.5 --
-- 5 --
V
V
V
V
V
V
V
-- 0.5 3 A
2 -- 10
A
2 -- 12
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7738-00 November 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT7738
IDD_OP1 vs. Temperature
2.2
2.0
1.8
1.6
1.4
-50
-25
0 25 50 75
Temperature (°C)
100 125
66.0
RT7738G/L/A
fOSC vs. VDD
65.5
65.0
64.5
64.0
9
12 15 18 21 24 27
VDD (V)
101.0
RT7738H
100.5
fOSC vs. VDD
100.0
99.5
99.0
9
12 15 18 21 24 27
VDD (V)
IDD_OP2 vs. Temperature
2.0
1.8
1.6
1.4
1.2
1.0
-50
-25
0 25 50 75
Temperature (°C)
100 125
fOSC vs. Temperature
70.0
RT7738G/L/A
67.5
65.0
62.5
60.0
57.5
55.0
-50
-25
0 25 50 75
Temperature (°C)
100 125
fOSC vs. Temperature
110
RT7738H
105
100
95
90
-50
-25
0 25 50 75
Temperature (°C)
100 125
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7738-00 November 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet RT7738.PDF ] | |
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