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부품번호 | R7731A 기능 |
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기능 | Burst Triple-Mode PWM Flyback Controller | ||
제조업체 | RICHPOWER | ||
로고 | |||
전체 14 페이지수
R7731A
Burst Triple-Mode PWM Flyback Controller
General Description
The R7731A is 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
R7731A 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 external power MOSFET from being
damaged by supply over voltage, the R7731A output driver
is clamped at 12V. Furthermore, R7731A features fruitful
protections like Over Load Protection (OLP) and Over
Voltage Protection (OVP) to eliminate the external
protection circuits and provide reliable operation. R7731A
is available in SOT-23-6 and DIP-8 packages.
Applications
Adaptor and Battery Charger
ATX Standby Power
Set-Top Box (STB)
DVD and CD(R)
TV/Monitor Standby Power
PC Peripherals
Typical Application Circuit
Features
Very Low Start-up Current (<30uA)
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
Over Temperature Protection
Over Load Protection
Soft Driving for Reducing EMI
High Noise Immunity
Opto-Coupler Short Protection
RoHS Compliant and Halogen Free
AC Mains
(90V to 265V)
VO+
VO-
RT VDD
R7731A
COMP
GATE
GND
CS
#
R7731A-07 Mar 2010
# See Application Information
1
R7731A
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VDD ----------------------------------------------------------------------------------------- −0.3V to 30V
GATE Pin -------------------------------------------------------------------------------------------------------------- −0.3V to 20V
RT, COMP, CS Pin -------------------------------------------------------------------------------------------------- −0.3V to 6.5V
IDD ----------------------------------------------------------------------------------------------------------------------- 10mA
Power Dissipation, PD @ TA = 25°C
SOT-23-6 --------------------------------------------------------------------------------------------------------------- 0.4W
DIP-8 ------------------------------------------------------------------------------------------------------------------- 0.714W
Package Thermal Resistance (Note 2)
SOT-23-6, θJA --------------------------------------------------------------------------------------------------------- 250°C/W
DIP-8, θJA -------------------------------------------------------------------------------------------------------------- 140°C/W
Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 4kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 250V
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VDD ----------------------------------------------------------------------------------------- 12V to 25V
Operating Frequency ------------------------------------------------------------------------------------------------ 50k to 130kHz
Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDD = 15V, RT = 100kΩ, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Conditions
VDD Section
VDD Over Voltage Protection Level VOVP
On Threshold Voltage
VTH_ON
VDD On/Off Hysteresis
V DD_H YS
Start-up Current
Operating Current
VDD Holdup Mode Hysteresis
Ending Level
IDD _S T
IDD _O P
V DD_H YS
VDD = VTH_ON – 0.1V
VDD = 15V, RT = 100kΩ,
GATE = Open, VCOMP = 2.5V
VCOMP < 1.6V
VDD Holdup Mode Entry Level
VDD_LOW VCOMP < 1.6V
VDD Clamp Voltage
Oscillator Section (RT pin)
Normal PWM Frequency
V DD_C LA MP
fOSC
RT = 100kΩ
Min Typ Max Unit
25.5 27 28.5 V
13 14 15 V
3 4 5V
-- 20 30 µA
-- 1.1 2.2 mA
-- 11.5 --
-- 11 --
-- 29 --
V
V
V
60 65 70 kHz
To be continued
4 R7731A-07 Mar 2010
4페이지 R7731A
VCLAMP vs. Temperature
13.0
12.5
12.0
11.5
11.0
10.5
10.0
VDD = 20V, CL =
-40 -15 10 35 60 85 110 135
Temperature (°C)
ISUPPLY vs. Temperature
0.50
0.45
0.40
0.35
COMP Pin Open
No Gate Output
0.30
ISUPPLY = IDD_OP − ICOMP
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
VGATE_OFF vs. VDD
600
575
550
525
500
475
450
425
ISINK = 20mA
400
11 12 13 14 15 16 17 18 19 20 21 22
VDD (V)
R7731A-07 Mar 2010
GATE (Rising/Falling) vs. Temperature
350
300
250
Rising
200
150
100 Falling
50
VDD = 20V, CL =
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
0.426
0.424
0.422
ISUPPLY vs. VDD
0.420
0.418
0.416
0.414
0.412
0.410
0.408
COMP Pin Open
No Gate Output
ISUPPLY = IDD_OP − ICOMP
11 12 13 14 15 16 17 18 19 20 21 22
VDD (V)
VCLAMP vs. VDD
13
12
11
10
9
8
ISOURCE = 20mA
7
11 12 13 14 15 16 17 18 19 20 21 22
VDD (V)
7
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
R7731 | Burst Triple-Mode PWM Flyback Controller | Richtek Technology |
R7731A | Burst Triple Mode PWM Flyback Controller | Richtek Technology |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |