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PDF R7780 Data sheet ( Hoja de datos )

Número de pieza R7780
Descripción Burst Triple-Mode PWM Controller
Fabricantes RICHPOWER 
Logotipo RICHPOWER Logotipo



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No Preview Available ! R7780 Hoja de datos, Descripción, Manual

Preliminary
R7780
Burst Triple-Mode PWM Controller with Integrated HV
Start-up Device for Zero Power Monitor Application
General Description
Features
The R7780 is a high-performance current mode PWM
controller with integrated HV start-up device inside. During
start-up, a current source through integrated HV device to
charge VDD capacitor for quick start-up while it dissipates
no loss in normal operation.
The R7780 provides the users a superior AC/DC power
application of higher efficiency, few external component
counts, and low cost solution. It features frequency jitter,
Under Voltage LockOut (UVLO), Leading Edge Blanking
(LEB), internal slope compensation in the tiny SOP-7
package. It offers complete protection coverage with Over
Temperature Protection (OTP), Over Load Protection (OLP)
and Over Voltage Protection (OVP).
Moreover, it also provides a special interface for zero power
application when the converter is in sleeping mode. EN/
DIS pin receives ON/OFF signal from secondary scalar
controller. During turning off, the controller will be shutdown
completely with pretty low power consumption.
Integrated HV Start-up Device
Enable/Disable Function
UVLO: 9V/16.5V
Current Mode Control
Built-in 65kHz Operation Frequency
Built-in Jittering Frequency
Internal PWM Leading Edge Blanking
Internal Slope Compensation
Compensated Burst Triple-Mode PWM
Cycle-by-Cycle Current Limit
Internal Auto Recovery OVP
Internal Auto Recovery OLP
Internal Auto Recovery OTP
CS Pin Open Protection
Secondary Rectifier Short Protection
Soft Driving for Reducing EMI Noise
High Noise Immunity
RoHS Compliant and Halogen Free
Ordering Information
R7780
Package Type
S : SOP-7
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richpower Green products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
For marking information, contact our sales representative
directly or through a Richpower distributor located in your
area, otherwise visit our website for detail.
Applications
Switching AC/DC Adaptor
TV and Monitor Application
Low Standby Power Home Appliance
Pin Configurations
(TOP VIEW)
EN/DIS
COMP
CS
GND
2
3
4
8 HV
7
6 VDD
5 GATE
SOP-7
R7780-06P Jan 2010
1

1 page




R7780 pdf
Preliminary
R7780
Parameter
Symbol
Conditions
Min Typ Max Unit
Oscillator Section
Normal PWM Frequency
Maximum Duty Cycle
PWM Frequency Jitter Range
fOSC
DC YMA X
f
60 65 70 kHz
70 75 80 %
-- ±7 -- %
PWM Frequency Jitter Period
Frequency Variation Versus VDD
Frequency Variation Versus Temp.
COMP Input Section
TJIT
fDV
fDT
For 65kHz
-- 4 -- ms
VDD = 12V to 25V
-- -- 2 %
TA = -30°C to 105°C (Note 5) -- -- 5 %
Open-Loop Voltage
VCOMP_OP COMP pin open
COMP Open 56ms Protection
V COMP_ 56
COMP Open-Loop Protection Delay
Time
TOLP
5.5 5.75
5.25 --
-- 56
6
--
--
V
V
ms
Short Circuit COMP Current
Current-Sense Section
IZERO
VCOMP = 0V
-- 272 400 µA
Initial Current Limit Offset
Leading Edge Blanking Time
Internal Propagation Delay Time
Minimum On Time
GATE Section
VCSTH
TLEB
TPD
T O N_M IN
(Note 6)
(Note 6)
0.67 0.7 0.73
150 250 350
-- 100 --
250 350 450
V
ns
ns
ns
Gate Output Clamping Voltage
Rising Time
Falling Time
EN/DIS Interface Section
VCLAMP
TR
TF
VDD = 25V
VDD = 15V, CL = 1nF
VDD = 15V, CL = 1nF
-- 14 --
-- 125 --
-- 45 --
V
ns
ns
Enable Threshold
V EN_ TH
0.8 1 1.2 V
EN/DIS Pin Max Clamping Current
-- -- 30 µA
Note 1. Stresses beyond those listed under Absolute Maximum Ratingsmay 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.
Note 6. Leading edge blanking time and internal propagation delay time are guaranteed by design.
R7780-06P Jan 2010
5

5 Page





R7780 arduino
Preliminary
Secondary Rectifier Short Protection: As shown in
Figure 2. The current spike during secondary rectifier
short test is extremely high because of saturated main
transformer. Meanwhile, the transformer acts like a
leakage inductance. During high line, the current in
power FET is sometimes too high to wait for a 56ms
OLP delay time. To offer better and easier protection
design, the R7780 shuts down the controller after
couples of cycles before fuse is blown up.
Secondary Rectifier Short
VDD
VCOMP
VCS
Figure 2. Secondary Rectifier Short Protection
R7780
R7780-06P Jan 2010
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