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PDF R7731 Data sheet ( Hoja de datos )
| Número de pieza | R7731 | |
| Descripción | Burst Triple-Mode PWM Flyback Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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R7731
Burst Triple Mode PWM Flyback Controller
General Description
The R7731 is a high performance, low cost, low start-up
current, current mode PWM controller with burst triple
mode to support green mode power saving operation. The
R7731 integrates functions of Soft-Start, Under Voltage
Lockout (UVLO), Leading Edge Blanking (LEB), Over
Temperature Protection (OTP), internal slope
compensation. It provides the users a superior AC/DC
power application of higher efficiency, low external
component counts and lower cost solution.
To protect the external power MOSFET from being
damaged by supply over voltage, the R7731 output driver
is clamped at 12V. Furthermore, R7731 features fruitful
protections like OLP (Over Load Protection) ,OVP (Over
Voltage Protection) to eliminate the external protection
circuits and provide reliable operation. R7731 is available
in SOT-23-6 and DIP-8 packages.
Applications
z Adaptor and Battery Charger
z ATX Standby Power
z Set Top Boxes (STB)
z DVD and CD(R)
z TV/Monitor Standby Power
z PC Peripherals
Typical Application Circuit
Features
z Very Low Start-Up Current (<30μA)
z 10/14V UVLO
z Soft-Start Function
z Current Mode Control
z Jittering Switching Frequency
z Internal Leading Edge Blanking
z Built-in Slope Compensation
z Burst Triple Mode PWM for Green-Mode
z Cycle-by-Cycle Current Limiting
z Feedback Open Protection
z Output Over Voltage Protection
z Over Temperature Protection
z Over Load Protection
z Soft Driving for Reducing EMI
z High Noise Immunity
z Opto Coupler Short Protection
z RoHS Compliant and Halogen Free
AC Mains
(90V to 265V)
VO+
VO-
RT VDD
R7731
COMP
GATE
GND
CS
DS7731-03 March 2011
www.richtek.com
1
1 page  
R7731
Parameter
Symbol
Test Conditions
Frequency Variation Versus VDD
Deviation
fDV
VVDD = 12V to 25V
Frequency Variation Versus
Temperature Deviation
fDV TA = −30°C to 105°C (Note 5)
COMP Input Section
Open Loop Voltage
COMP Open Loop Protection Delay
Cycles
Short Circuit COMP Current
Current Sense Section
Peak Current Limitation
Leading Edge Blanking Time
Propagation Delay Time
GATE Section
Rising Time
Falling Time
Gate Output Clamping Voltage
Over Temperature Protection
OTP Hysteresis
VCOMP-OP
TOLP
IZERO
VCSTH
TLEB
TPD
TR
TF
Vclamp
TOTP
TOTP_hys
COMP pin Open
RT = 100kΩ
VCOMP = 0V
VDD = 15V, CL = 1nF
VDD = 15V, CL = 1nF
VDD = 22V
Min Typ Max Unit
-- -- 2 %
-- -- 5 %
5 5.5 6
V
-- 29 -- ms
-- 1.2 2.2 mA
0.65 0.7 0.75
-- 420 520
-- 100 --
V
ns
ns
-- 250 350
-- 150 250
-- 12 --
140 --
--
-- 30 --
ns
ns
V
°C
°C
Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Guaranteed by design.
DS7731-03 March 2011
www.richtek.com
5
5 Page 
R7731
A
B
E
C
L
I
DF
J
Symbol
A
B
C
D
E
F
I
J
L
Dimensions In Millimeters
Min
9.068
6.198
Max
9.627
6.604
3.556
4.318
0.356
0.559
1.397
1.651
2.337
2.743
3.048
3.556
7.366
8.255
0.381
Dimensions In Inches
Min
0.357
0.244
Max
0.379
0.260
0.140
0.170
0.014
0.022
0.055
0.065
0.092
0.108
0.120
0.140
0.290
0.325
0.015
8-Lead DIP Plastic Package
Richtek Technology Corporation
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)86672399 Fax: (8862)86672377
Email: [email protected]
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design,
specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed
by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
DS7731-03 March 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet R7731.PDF ] | |
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