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PDF PR9853 Data sheet ( Hoja de datos )
| Número de pieza | PR9853 | |
| Descripción | Low Cost Green-Power PWM Controller | |
| Fabricantes | Power-Rail | |
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PR9853
Low Cost Green-Power PWM Controller
With Low EMI Technique
Features
l Low Cost, PWM&PFM&hiccup mode
l Low Start-up Current (about 3μA)
l Low Operating Current (about 1.2mA)
l Current Mode Operation
l VDD Under Voltage Lockout (UVLO)
l Built-in Synchronized Slope
Compensation
l Built-in Low EMI Technique
l Programmable PWM Frequency
l Audio Noise Free Operation
l Leading edge Blanking on SEN input
l Constant output power limiting in
universal AC input Range
l SOT-23-6L and DIP-8 Pb-Free
Packaging
l Good Protection Coverage With Auto
Self-Recovery
Complete Protection with
Ø Soft Clamped GATE output voltage
18.0V
Ø VDD over voltage Clamp 34.0V
Ø Cycle-by-cycle current limiting
Ø Output SCP (Short circuit Protection)
Ø Output OLP (Over Load Protection)
Ø High-Voltage CMOS Process with ESD
Applications
l Switching AC/DC Adapter
l Battery Charger
l Open Frame Switching Power Supply
l Standby Power Supplies
l Set-Top Box Power Supplies
l 384X Replacement
General Description
PR9853 is a highly integrated and low cost
current mode PWM controller, which is
ideal for low power current mode of offline
AC-DC fly-back converter applications. By
adjusting the external resistors to change
the operating frequency, and then IC
automatically enters PFM or hiccup mode
in light-load or zero-load condition.
Thereby reduce the standby power loss
and achieve power-stored function.
Because of the very low start-up current, a
large value start-up resistor can be used in
PR9853.
Built-in synchronized slope compensation
enhances the stability of the system and
avoids sub-harmonic oscillation. The
dynamic peak current limiting circuit
reduces the variation of output power
which caused by system delay over a
universal AC input range. Leading edge
blanking circuit at current sense input
could remove the signal glitch due to the
reverse recovery of diode in snubber
circuit, and thus greatly reduces the
amount of external components and the
system cost for this design.
Cycle-by-Cycle current limiting ensures a
safe operation even in the condition of
short.
Excellent EMI performance is achieved by
built-in soft driver and low EMI technique.
The PR9853 offers rich protection features
such as VDD over voltage Clamp 、
OLP(Over Load Protection) 、 SCP(Short
circuit protection)、Sense Fault Protection
and OCP(Over current protection). The
output voltage of PR9853 is softly clamped
to maximum 18.0V to protect the power
MOSFET. PR9853 is offered in SOT-23-6L
and DIP-8 packages.
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1 page  
PR9853
Low Cost Green-Power PWM Controller
With Low EMI Technique
Electrical Characteristics
(Ta=25°C unless otherwise noted, VDD = 16V)
Symbol
Parameter
Supply Voltage (VDD Pin)
IST Startup Current
ISS Operating Current
VDDON Turn-on Threshold Voltage
VDDOFF Turn-off Threshold Voltage
VDDCLAMP VDD Clamp Voltage
VDDAIS
Anti Intermission Surge
VDD Voltage
Voltage Feedback (FB Pin)
IFB
VFB
IFB_0D
Short Circuit Current
Open Loop Voltage
Zero Duty Cycle FB current
VPFM
Vhiccup
VOLP&SCP
Enter PFM Threshold VFB
Enter hiccup mode Threshold VFB
Enter OLP&SCP FB voltage
TOLP&SCP OLP&SCP min. delay Time
Current Sensing (SEN Pin)
VTH_L
SEN Maximum Voltage Level
（Dmin=0%）
VTH_H
SEN Maximum Voltage
Level(Dmax=78%)
TPD Delay to Output
RCS Input Impedance
Leading edge blanking time
TLEB
( LEB )
Conditions
VFB=0V
VFB=3V
VFB=Open
IVDD=10mA
VFB=0V
VFB=Open
RI=100K
RI=100K,
FB=3.3V
RI=100K,
FB=3.3V
FB=3.3V
RI=100K
Min. Typ. Max. Unit
3.0 20.0
3.0 6
1.2 4
0.8 3.5
13.0 14.0 15.0
7.8 8.8 9.8
31 36
μA
mA
mA
mA
V
V
V
9.4 V
0.65
4.8
0.59
1.80
1.2
3.7
33 40 50
mA
V
mA
V
V
V
mS
0.80 V
1.05 V
75 ns
40 KΩ
300 nS
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5 Page 
PR9853
Package Dimensions
DIP-8L
Low Cost Green-Power PWM Controller
With Low EMI Technique
Dimensions
Symbol
A
A1
A2
b
b1
D
E
E1
e
L
eB
θ˚
Min.
0.381
3.175
9.017
6.223
2.921
8.509
0˚
Millimeters
Typ.
Max.
5.334
3.302
1.524
0.457
9.271
7.620
6.350
2.540
3.302
9.017
7˚
3.429
10.160
6.477
3.810
9.525
15˚
Min.
0.015
0.125
0.355
0.245
0.115
0.335
0˚
Inches
Typ.
0.130
0.060
0.018
0.365
0.300
0.250
0.100
0.130
0.355
7˚
Max.
0.210
0.135
0.400
0.255
0.150
0.375
15˚
V2.1
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet PR9853.PDF ] | |
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