|
|
PDF R7914 Data sheet ( Hoja de datos )
| Número de pieza | R7914 | |
| Descripción | Enhanced Burst Triple-Mode PWM Controller | |
| Fabricantes | RICHPOWER | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de R7914 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
Preliminary
R7914
Enhanced Burst Triple-Mode PWM Controller with Integrated
Power MOSFET for Flyback Converts
General Description
Features
The R7914 series consists of a high voltage power
MOSFET and a high-performance, low cost, low start-up
current and current mode PWM controller with burst triple-
mode to support green mode power saving operation. The
R7914 integrates functions of soft start, Under VoItage
LockOut (UVLO), Leading Edge Blanking (LEB), Over
Temperature Protection (OTP) and 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 internal power MOSFET from being
damaged by supply over voltage, the R7914 driver is
clamped at 12V. Furthermore, R7914 features fruitful
protections like Over Load Protection (OLP) and Over
Voltage Protection (OVP) to eliminate the external
protection circuits and provide reliable operation. R7914
is available in DIP-8 package.
Integrated 650V Power MOSFET
Very Low Start-up Current (<30µA)
10/14V UVLO
Soft Start Function
Current Mode Control
Jittering Switching Frequency
Internal Leading Edge Blanking
Built-in Slope Compensation
Burst Triple-Mode PWM for Green-Mode
Cycle-by-Cycle Current Limit
Feedback Open Protection
Over Voltage Protection
Output Temperature Protection
Over Load Protection
Soft Driving for Reducing EMI
High Noise Immunity
Opto-Coupler Short Protection
RoHS Compliant and Halogen Free
Ordering Information
R7914
Package Type
N : DIP-8
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Applications
Adaptor
ATX Standby Power
Set-Top Box (STB)
DVD and CD(R)
TV/Monitor Standby Power
PC Peripherals
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.
Pin Configurations
(TOP VIEW)
DRAIN DRAIN GND GND
87
65
2 34
CS VDD COMP RT
DIP-8
R7914-04P Mar 2010
1
1 page  
Preliminary
R7914
Parameter
Symbol
Conditions
Min Typ Max Unit
Oscillator Section (RT pin)
Normal PWM Frequency
Maximum Duty Cycle
PWM Frequency Jitter Range
fOSC
DCYMAX
Δf
RT = 100kΩ
60 65 70 kHz
70 75 80 %
-- ±6 -- %
PWM Frequency Jitter Period
Frequency Variation Versus VDD
Deviat ion
TJIT
fDV
RT = 100kΩ
VDD = 12V to 25V
-- 4 -- ms
-- -- 2 %
Frequency Variation Versus
Temperature Deviation
fDT TA = −30°C to 105°C (Note 5) -- -- 5 %
COMP Input Section
Open Loop Voltage
COMP Open-loop Protection Delay
Time
VCOMP_OP COMP pin open
TOLP
RT = 100kΩ
5.2 5.6 6
V
-- 60 -- ms
Short Circuit COMP Current
Current-Sense Section
IZERO
VCOMP = 0V
-- 1.2 2.2 mA
Peak Current Limitation
Leading Edge Blanking Time
MOS Section
VCSTH
TLEB
(Note 6)
0.8 0.85 0.9
-- 420 520
V
ns
Drain-Source Breakdown Voltage BVDSS
VGS = 0V, ID = 1mA
650 -- -- V
Drain-Source Leakage Current
IDSS
VDS = 600V, VGS = 0V
-- -- 10 µA
Drain-Source On-Resistance
RDS_ON VGS = 10V, ID = 1.6A
-- -- 4.4 Ω
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. Without copper clad.
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 is guaranteed by design.
R7914-04P Mar 2010
5
5 Page 
Preliminary
R7914
PCB Layout Guide
A proper PCB layout can abate unknown noise interference
and EMI issue in the switching power supply. Please refer
to the guidelines when you want to design PCB layout for
switching power supply:
I. The current path(1) from bulk capacitor, transformer,
IC, Rcs return to bulk capacitor is a huge high
frequency current loop. It must be as short as possible
to decrease noise coupling and kept a space to other
low voltage traces, such as IC control circuit paths,
especially.
II. The path(2) from RCD snubber circuit to MOSFET is
also a high switching loop. Keep it as small as
possible.
III.The path(3) from RT pin to IC ground(d) is a sensitive
loop. It must be as short as possible and kept a space
to transformer to reduce flux coupling.
IV. It is good for reducing noise, output ripple and EMI
issue to separate ground traces of bulk capacitor(a),
MOSFET(b), auxiliary winding(c) and IC control circuit
(d). Finally, connect them together on bulk capacitor
ground(a). The areas of these ground traces should
be kept large.
V. Placing bypass capacitor for abating noise on IC is
highly recommended. The bypass capacitor should
be placed as close to controller as possible.
VI.In order to minimize reflected trace inductance and
EMI, it is minimize the area of the loop connecting the
secondary winding, the output diode, and the output
filter capacitor. In addition, apply sufficient copper area
at the anode and cathode terminal of the diode for
heatsinking. Apply a larger area at the quiet cathode
terminal. A large anode area can increase high-
frequency radiated EMI.
AC Mains
(90V to 265V)
(a)
(2)
(3)
OPTO
4 RT R7914 VDD 2
3
COMP
5 GND
6
GND
7
DRAIN
8
DRAIN
1
CS
(d)
(b)
(c)
(1)
CBULK Ground (a)
Trace
IC
Ground (d)
Trace
Auxiliary
Ground (c)
Trace
MOSFET
Ground (b)
R7914-04P Mar 2010
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet R7914.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| R7914 | Enhanced Burst Triple-Mode PWM Controller | RICHPOWER |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |