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PDF RT7730 Data sheet ( Hoja de datos )
| Número de pieza | RT7730 | |
| Descripción | Burst Triple-mode PWM Flyback Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Preliminary
RT7730
Burst Triple-mode PWM Flyback Controller
General Description
The RT7730 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
RT7730 integrates functions of Soft Start, Under VoItage
Lockout (UVLO), Leading Edge Blanking (LEB), Over
Temperature Protuction (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 RT7730 output driver
is clamped at 13.5V. Furthermore, RT7730 features fruitful
protections like OLP (Over Load Protection) ,OVP (Over
Voltage Protection) to eliminate the external protection
circuits and provide reliable operation. RT7730 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 Internal Leading-Edge Blanking
z Built-in Slope Compensation
z Burst Triple-Mode PWM for Green-Mode
z Cycle-by-Cycle Current Limiting
z Secondary Rectifier Short Protection
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 100% Lead (Pb)-Free
Mains
(90V to 265V)
Vo+
Vo-
3 RT
5
VDD
GATE 6
RT7730
2 COMP
GND
1
CS 4
DS7730-00PT05 June 2007
www.richtek.com
1
1 page  
Preliminary
RT7730
Par amete r
Symbol
Conditi ons
Frequency Variation Versus
Temperature Deviation
COMP Input Section
Open Loop Voltage
COMP Open-loop Protection Delay
cycles
fDV
VCOMP-OP
TOLP
TA = −30°C to 105°C (Note 5)
COMP pin Open
RT = 100kΩ
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
IZE RO
VCOMP = 0V
VCSTH
TLEB
TPD
TR
TF
Vclamp
TOTP
TOTP_hys
VDD = 15V, CL = 1nF
VDD = 15V, CL = 1nF
VDD = 22V
Min Typ Max Unit
-- -- 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
-- 15 --
-- 140 --
V
°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 recommended. The human body model is a 100pF capacitor discharged
through a 1.5kΩ resistor into each pin.
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.
DS7730-00PT05 June 2007
www.richtek.com
5
5 Page 
Preliminary
z Feedback Open and Opto Coupler Short : This will
trigger OVP or 30ms delay protection. It depends on
which one occurs first.
z Secondary Rectifier Short : This is a safety level
issue. The inrush current due to secondary rectifier
shorted even can’ t be limited by current limit function.
The high slew rate current will damage power MOSFET
in few cycles especially in high line. RT7730 provide an
extra 1.7V current comparator to shutdown the system
without any deglitch or delay.
z OTP : Internal 110/140°C hysteresis comparator will
provide over temperature protection (OTP). OTP will not
shutdown system. It stops the system from switching
until the temperature is under 110°C. Meanwhile, if VDD
touches VDD turn off threshold voltage, system will
hiccup.
RT7730
DS7730-00PT05 June 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT7730.PDF ] | |
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