Flyback Controller. R7735 Datasheet

R7735 Controller. Datasheet pdf. Equivalent

R7735 Datasheet
Recommendation R7735 Datasheet
Part R7735
Description High Performance PWM Flyback Controller
Feature R7735; ® R7735 High Performance PWM Flyback Controller General Description R7735 series is the successor .
Manufacture Richtek Technology
Datasheet
Download R7735 Datasheet




Richtek Technology R7735
®
R7735
High Performance PWM Flyback Controller
General Description
R7735 series is the successor of R7732/3 and fully
compatible with most of SOT-23-6 / DIP-8 product so far
in the market. It has enhanced mode PWM controller and
owns excellent green power performance, especially under
light load and no load conditions. It focuses on "easy to
design" in different applications and it will save both design
effort and external components.
Besides the general features shown in the Features
section, R7735 covers wide protection options, such as
internal Over Load Protection (OLP) and Over Voltage
Protection (OVP) to eliminate the external protection
circuits. Moreover, it also features Secondary Rectifier
Short Protection (SRSP) and CS pin open protection. This
protection will make the PSU design for reliability and
safety easier.
R7735 is designed for power supply such as NB adaptor
which is a very cost effective and compact design. The
precise external OVP and Over Temperature Protection
(OTP) can be implemented by very simple circuit. The
start-up resistors can also be replaced by bleeding
resistors to save power loss and component count.
Ordering Information
R7735
(B)* (* : See Version Table)
Package Type
E : SOT-23-6
N : DIP-8 (R7735G Only)
Lead Plating System
G : Green (Halogen Free and Pb Free)
R7735 Version (Refer to Version Table)
Note :
Richtek 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.
Features
No Load Input Power Under 100mW
Accurate Over Load Protection
UVLO 9V/14V
Current Mode Control
Slope Compensation
Internal Leading Edge Blanking
Excellent Green Power Performance
Cycle-by-Cycle Current Limit
Internal Over Voltage Protection
Secondary Rectifier Short Protection
Opto-Coupler Short Protection
Feedback Open-Loop Protection
CS Pin Open Protection
Jittering Frequency
PRO Pin for External Arbitrary OVP/OTP
Soft Driving for EMI Noise
High Noise Immunity
RoHS Compliant and Halogen Free
Application
Switching AC/DC Adaptor
DVD Open Frame Power Supply
Set-Top Box (STB)
ATX Standby Power
TV/Monitor Standby Power
PC Peripherals
NB Adaptor
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
R7735-04 May 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek Technology R7735
R7735
Pin Configurations
GATE VDD CS
654
23
GND COMP PRO
SOT-23-6
(TOP VIEW)
GND COMP NC PRO
87
65
2 34
GATE VDD NC CS
DIP-8
R7735 Version Table
Version
Frequency
R7735G
65kHz
OLP Delay Time
56ms
Internal OVP(27V) Auto Recovery
OLP & SRSP
Auto Recovery
PRO Pin High
Latch
PRO Pin Low
Auto Recovery
R7735R
65kHz
56ms
Auto Recovery
Auto Recovery
Auto Recovery
Latch
R7735L
65kHz
56ms
Latch
Auto Recovery
Latch
Latch
* : VSRSP_TH : Secondary Rectifier Short Protection (SRSP) triggered threshold.
R7735XGE : VSRSP_TH = 1.7V, X = G/R/L/A
R7735HGE(B) : VSRSP_TH = 2.6V
R7735A
65kHz
28ms
Latch
Latc h
Latch
Latch
R7735H
100kHz
36ms
Auto Recovery
Auto Recovery
Auto Recovery
Latch
Typical Application Circuit
AC Mains
(90V to 265V)
Vo+
Vo-
NTC
PRO VDD GATE
R7735
COMP
GND
CS
#
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
# : See Application Information
is a registered trademark of Richtek Technology Corporation.
R7735-04 May 2014



Richtek Technology R7735
R7735
Functional Pin Description
Pin No.
SOT-23-6 DIP-8
Pin Name
Pin Function
1
8 GND
Ground.
2
7 COMP
Voltage Feedback. By connecting an opto-coupler to close control loop
and achieve the regulation.
3
5 PRO
For External Arbitrary OVP or OTP.
4 4 CS Primary Current Sense.
5
2 VDD
Power Supply.
6
1 GATE
Gate Drive Output to Drive the External MOSFET.
-- 3, 6 NC
No Internal Connection.
Function Block Diagram
VDD
PRO
IBIAS
VL_TH
Auto
Recovery
VSRSP_TH
Latch
VH_TH
Secondary Rectifier Short
- & CS Open Protection
+
Shutdown
Logic
Brownout
Sensing
COMP Open
Sensing
OLP
Counter
Auto
Recovery
Latch
OVP
+
-
27V
POR
Oscillator
UVLO
+
-
9V/14V
Bias &
Bandgap
COMP
CS
Constant
Power
Slope
Ramp
LEB X3
Dmax
-
-
+
PWM
Comparator
S
Q
R
Soft Driver
Burst Switching Green
Mode
VCOMP
VBURL
VBURH
VDD
GATE
GND
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
R7735-04 May 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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