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PDF RT7738F Data sheet ( Hoja de datos )
| Número de pieza | RT7738F | |
| Descripción | Multi-Mode Flyback Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT7738F (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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RT7738F
SmartJitterTM Multi-Mode Flyback Controller
General Description
The RT7738F is 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 RT7738F 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 RT7738F is
the best choice for product designers.
The RT7738F 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 RT7738F 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
RT7738F
GND
CS
(Optional)
(Optional)
(Optional)
(Optional)
VO+
VO-
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7738F-00 November 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT7738F
Parameter
Symbol
Test Conditions
Minimum Green Mode
Frequency
fGM_MIN
VCOMP < VGM_ED
PWM Frequency Jittering
Range
f
PWM Frequency Jittering
Period
TJIT
fOSC = 65kHz
Frequency Variation Versus
VDD Deviation
fDV
VDD = 9V to 23V
Frequency Variation Versus
Temperature Deviation
fDT
TA = 30C to 105C
COMP Input Section
Open Loop Voltage
VCOMP_OP COMP pin open
Short Circuit Current of COMP IZERO
Delay Time of COMP
Open-loop Protection
TOLP
Green Mode Entry Voltage
VGM_ET
VCOMP = 0V
fOSC = 65kHz
Green Mode Ending Voltage VGM_ED
Current Sense Section
Maximum Current Limit
VCS_MAX
Leading Edge Blanking Time TLEB
Threshold Voltage of
Secondary Rectifier Short
Protection
VSRSP_TH
Threshold Voltage for External
Over-temperature Protection
Application
Delay Time for External
Over-temperature Protection
VOTP_TH
TD_OTP
GATE Section
(Note 5)
fOSC = 65kHz
Rising Time
TR CL = 1nF
Falling Time
TF CL = 1nF
Gate Output Clamping Voltage VCLAMP VDD = 23V
DMAG Section
Threshold Voltage of
Over-voltage Protection
VDMAG_OVP
Blanking Time Before
Over-voltage Protection of
DMAG Pin
TBK_OVP VCS = 0.36V
Threshold Voltage of
Under-voltage Protection
Delay Time of Under-voltage
Protection
On Threshold Current
VDMAG_UVP After TD_OSP, COMP pin open
TD_OSP
fOSC = 65kHz
IDMAG_BNI
Min Typ Max Unit
-- 22.5 -- kHz
-- ±6 --
%
-- 16 -- ms
-- -- 2 %
-- -- 5 %
-- 2.5 --
-- 0.135 --
-- 64 --
-- 1.75 --
-- 1.6 --
V
mA
ms
V
V
0.38 0.40 0.42
350 475 600
V
ns
-- 1.1 --
V
-- 0.7 --
V
-- 64 -- ms
-- 250 --
-- 30 --
-- 13 --
ns
ns
V
2.45 2.5 2.55 V
2.1 2.9 3.7 s
0.3 0.4 0.5 V
-- 16 --
141 160 179
ms
A
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7738F-00 November 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT7738F
TLEB vs. Temperature
600
550
500
450
400
350
-50
-25
0 25 50 75
Temperature (°C)
100 125
VSRSP_TH vs. Temperature
1.15
1.13
1.11
1.09
1.07
1.05
-50
-25
0 25 50 75
Temperature (°C)
100 125
TR vs. Temperature
400
350
300
250
200
150
-50
-25
0 25 50 75
Temperature (°C)
100 125
VCLAMP vs. Temperature
14
13
12
11
10
-50
-25
0 25 50 75
Temperature (°C)
100 125
VOTP_TH vs. Temperature
0.76
0.74
0.72
0.70
0.68
0.66
-50
-25
0 25 50 75
Temperature (°C)
100 125
TF vs. Temperature
100
80
60
40
20
0
-50
-25
0 25 50 75
Temperature (°C)
100 125
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
DS7738F-00 November 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RT7738F.PDF ] | |
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