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PDF R7730 Data sheet ( Hoja de datos )
| Número de pieza | R7730 | |
| Descripción | Burst Triple-Mode PWM Flyback Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de R7730 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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Preliminary
R7730
Burst Triple-Mode PWM Flyback Controller
General Description
The R7730 is a high-performance, low cost, low startup
current, current mode PWM controller with burst triple-
mode to support green mode power saving operation. The
R7730 integrates functions of soft-start, Under VoItage
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 R7730 output driver
is clamped at 12V. Furthermore, R7730 features fruitful
protections like OLP (Over Load Protection) ,OVP (Over
Voltage Protection) to eliminate the external protection
circuits and provide reliable operation. R7730 is available
in SOT-23-6 package.
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 (<30uA)
z 10/14V UVLO
z Soft Start Function
z Current Mode Control
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 Halogne Free
AC Mains
(90V to 265V)
VO+
VO-
RT VDD
R7730
COMP
GATE
GND
CS
DS7730-00 May 2008
www.richtek.com
1
1 page  
Preliminary
R7730
Parameter
Symbol
Conditions
Min Typ Max Unit
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
VCOMP-OP
TOLP
COMP pin Open
RT = 100kΩ
Short Circuit COMP Current
Current-Sense Section
IZERO
VCOMP = 0V
Peak Current Limitation
Leading Edge Blanking Time
Propagation Delay Time
GATE Section
VCSTH
TLEB
TPD
Rising Time
Falling Time
Gate Output Clamping Voltage
TR
TF
Vclamp
VDD = 15V, CL = 1nF
VDD = 15V, CL = 1nF
VDD = 22V
Over Temperature Protection
TOTP
OTP Hysteresis
TOTP_hys
-- -- 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 ns
-- 150 250 ns
-- 12 --
V
-- 140 --
°C
-- 30 -- °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. Devices are ESD sensitive. Handling precaution is recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. 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 5. Guaranteed by design.
DS7730-00 May 2008
www.richtek.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet R7730.PDF ] | |
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