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SD4872RTR の電気的特性と機能

SD4872RTRのメーカーはSilan Microelectronicsです、この部品の機能は「CURRENT MODE PWM + PFM CONTROLLER」です。


製品の詳細 ( Datasheet PDF )

部品番号 SD4872RTR
部品説明 CURRENT MODE PWM + PFM CONTROLLER
メーカ Silan Microelectronics
ロゴ Silan Microelectronics ロゴ 




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SD4872RTR Datasheet, SD4872RTR PDF,ピン配置, 機能
Silan
Microelectronics
SD4872X_Datasheet
CURRENT MODE PWMPFM CONTROLLER
DESCRIPTION
SD4872X is a current mode PWM controller IC for high
performance, low standby power offline flyback converter
application.
In no load or light load condition, the IC operates in Light Load
Mode to reduce switching loss and improve efficiency.
Large startup resistor could be used in the startup circuit to
minimize the standby current because of low startup current.
SD4872X offers complete protection functions including cycle-
by-cycle over current protection, over load protection, over
voltage and under voltage protections for VDD voltage, etc.
Excellent EMI performance is achieved with frequency shuffling
technique and soft switching control at the totem pole gate
driver output.
FEATURES
APPLICATIONS
* Adapters
* Frequency shuffling to improve EMI performance
* Set-Top Box Power Supplies
* Light Load Mode for minimum standby power
* 65kHz switching frequency
* 10µA low startup current
* Internal LEB circuit
* VDD over-voltage and under-voltage protection
* External programmable over-temperature protection
* Brown-out protection
* External programmable output over-voltage protection
* Over-power compensation
* Gate output voltage clamp
* Cycle-by-cycle current limiting
* Over load protection
* SOP8 package
ORDERING INFORMATION
Part No.
SD4872
SD4872TR
SD4872R
SD4872RTR
Package
SOP-8-225-1.27
SOP-8-225-1.27
SOP-8-225-1.27
SOP-8-225-1.27
Marking
SD4872
SD4872
SD4872R
SD4872R
Material
Pb free
Pb free
Pb free
Pb free
Packing
Tube
Tape & Reel
Tube
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2012.09.07
Page 1 of 10

1 Page





SD4872RTR pdf, ピン配列
Silan
Microelectronics
SD4872X_Datasheet
ABSOLUTE MAXIMUM RATINGS
Characteristics
Supply Voltage
Feedback Voltage
SENSE Voltage
OTP Voltage
OVP Voltage
BO Voltage
Junction Temperature Range
Lead Temperature
Storage Temperature Range
Symbol
VDD
VFB
VSENSE
VOTP
VOVP
VBO
Tj
TL
Tstg
Rating
30
-0.3~6
-0.3~6
-0.3~6
-0.7~6
-0.3~6
-20~150
260
-55~160
Unit
V
V
V
V
V
V
°C
°C
°C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Tamb=25°C)
Characteristics
VDD
Startup Current
Operation Current
Start up Voltage
Shut down Voltage
Reset Voltage (latch status)
VDD OVP Voltage
VDD Clamp Voltage
Feedback
PWM Gain
FB Open Loop Voltage
FB Short Circuit Current
FB OL Threshold Voltage
OL Debounce Time
FB Input Impedance
Maximum Duty Cycle
Current Sense
LEB Time
SENSE Input Impedance
OC Control Delay
OC Detection Threshold
Switching Frequency
Oscillation Frequency
Frequency Stability With VDD
Light Load Mode Frequency
Symbol
Test Condition
IVDD_ST
IVDD
VSTART
VSHUT
VRESET
VVDDOVP
VVDD_CLP
VDD=12 V
VDD=16V, VFB =3V
IVDD =10mA
AVCS
VFB_OPEN
IFB_SHORT
VFB_OL
TD_OL
ZFB_IN
DMAX
ΔVFB /ΔVSENSE
FB short connected to
ground
VDD=16V
VFB =3V,VSENSE =0V
TLEB
ZSENSE_IN
TOC
VSENSE_OC
VBO=0.7V
fS
ΔfS_VDD
fS_LLM
VDD=8~25V
Min. Typ.
-- 10
-- 1.65
13.3 14.8
-- 7.8
-- 5.5
-- 27
-- 30
-- 2
4.6 5
0.35 0.4
-- 3.8
-- 50
15 20
-- 80
-- 300
-- 100
-- 70
0.85 0.9
60 65
-- 5
-- 22
Max.
20
--
16.0
--
--
--
--
--
5.4
0.45
--
--
--
--
--
--
--
0.95
70
--
--
Unit
µA
mA
V
V
V
V
V
V/V
V
mA
V
ms
kΩ
%
ns
kΩ
ns
V
kHz
%
kHz
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2012.09.07
Page 3 of 10


3Pages


SD4872RTR 電子部品, 半導体
Silan
Microelectronics
SD4872X_Datasheet
shown below.
VDD
VSTART
VSHUT
FB
VFB_OL
GATE
TD_OL
switching
non-switching
t
t
switching
non-switching
t
H/L Line Constant output power Compensation
By sensing AC input voltage, it’s to compensate the over-current protection threshold, to achieve constant
output power.
VDD Over-voltage Protection
When VDD is higher than clamp threshold voltage, the circuit enters into over-voltage protection status. The
MOSFET is off and the system enters AC latch status. If the system enters AC latch status, only when the
AC input is disconnected and the VDD drops below the reset voltage, the system is unlocked. When the AC
input is connected again, the system restarts.
The VDD over-voltage protection waveform is shown below.
VDD
VDDOVP
VSTART
VSHUT
VRESET
GATE
switching
switching
non-switching
AC input
AC off
AC on
t
t
t
Output Over-voltage Protection
The auxiliary winding port is connected to OVP pin through the resistor divider. The output voltage can be
sensing indirectly through the OVP pin. When OVP pin voltage is higher than output over-voltage threshold,
the circuit enters into over-voltage protection status. The MOSFET is off and the system enters AC latch
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1 2012.09.07
Page 6 of 10

6 Page



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部品番号部品説明メーカ
SD4872RTR

CURRENT MODE PWM + PFM CONTROLLER

Silan Microelectronics
Silan Microelectronics


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