SDC4566JTR-E1 [SDC]
Current Mode PWM Controller;型号: | SDC4566JTR-E1 |
厂家: | Shaoxing Devechip Microelectronics Co., Ltd |
描述: | Current Mode PWM Controller |
文件: | 总14页 (文件大小:440K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
PRIMARY DATASHEET
Features
Datasheet
General Description
SDC4566 is a highly integrated current mode PWM control
IC optimized for high performance, low standby power
and cost effective offline flyback converter applications in
sub 60W range.
Frequency shuffling technology for improved emc
performance
Audio noise free operation
Extended burst mode control for improved efficiency
and minimum standby power design
Internal synchronized slope compensation
Low VCC startup current and low operating current
Leading edge blanking on current sense input
Good protection coverage with auto self-recovery
(UVLO/OV/OLP/OTP)
The internal slope compensation improves system large
signal stability and reduces the possible subharmonic
oscillation at high PWM duty cycle output. Leading-edge
blanking on current sense(CS) input removes the signal
glitch due to snubber circuit diode reverse recovery and
thus greatly reduces the external component count and
system cost in the design.
FB/CS oop protection
Secondarectifier Short Protection
Package: SOT-23-6
SDC4566 offers complete protection coverage with
automatic self-recovery feature including cycle-by-cycle
current limiting (OCP), over load protection (OLP), VCC
over voltage clamp and under voltage lockout (UVLO). The
gate drive output is clamped to maximum 14V to protect
the power MOSFET.
Aplications
Battery charger
Power adapter
Set-top box power supplies
SOT-23-6
Figure 1. Package Type
December, 2013 Rev. 1.1
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PRIMARY DATASHEET
Datasheet
Pin Configuration
Package: SOT-23-6
1
6
5
4
GND
GATE
VCC
FB
2
3
PRO
SENSE
Figure 2. Pin Configuration
Pin Number
Pin Name
Function
1
GND
Ground
Feedback input pin. The PWM duty cycle is determined by voltage level into
this pin and SENSE pin input.
2
FB
3
4
5
6
PRO
SENSE
VCC
For external arbitrary OVP or OTP.
Curent sense input pin. Connected to MOSFET current sensing resistor node.
Chip DC power supply pin.
GATE
Totem-pole gate drive output for the power MOSFET.
Table 1. Pin Description
December, 2013 Rev. 1.1
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PRIMARY DATASHEET
Datasheet
Functional Block Diagram
VCC
5
VL-TH
﹢
﹣
Auto
Recovery
Auto
Recovery
﹢
﹣
PRO
3
VCLAMP
﹢
﹣
VH-TH
Secondary Rectifier Short
& SENSE Open Protection
VSRSP
POR
﹢
﹣
Shutdown
Logic
﹢
﹣
VUVLO-ONVUVLO-ON
Counter
FB Open
Sensing
OLP
Oscillator
Dmax
VFB-OP
SS
Constant
Power
SET
Soft
Drive
S
Q
Q
6
GATE
﹣
﹣
2
4
FB
R
CLR
﹢
Slope
Ramp
SENSE
VSENSE-th
﹢
﹣
LEB
Σ
1
GN
Figure 3. Functional Block Diagram
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PRIMARY DATASHEET
Datasheet
Ordering Information
-
X
SDC4566 X
X
E1: Pb-free
G1: Halogen-free
Circuit Type
Package
SOT-23-6: J
TR: Tape Reel
Part Number
Marking ID
Temperature
Package
Packing Type
Range
Pb-free
Halogen-ee
SDC4566JTR-G1
Pb-free
4566
Halogen-free
SOT-23-6
SDC4566JTR-E1
4566G
Tape Reel
-40℃-85℃
December, 2013 Rev. 1.1
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Datasheet
Absolute Maximum Ratings (NOTE: Stresses greater than those listed under Absolute Maximum Ratings may cause
permanent damage to the device.)
Parameter
VCC DC supply voltage
Symbol
VCC
Value
-0.3~30
32
Unit
V
VCC clamp voltage
VCC_CLAMP
ICLAMP
VFB
V
VCC DC clamp current
10
mA
V
VFB input voltage
-0.3~7
-0.3~7
-0.3~7
150
SENSE input voltage
VSENSE
VPRO
TJ
V
VPRO input voltage
V
Operating junction temperature
Storage temperature
°C
°C
mA
V
TSTG
~150
200
Latch-up test per JEDEC 78
ESD,HBM model per Mil-Std-883H,Method 3015
ESD,MM model per JEDEC EIA/JESD22-A115
-
HBM
MM
2000
200
V
Table 2. Absolute Maximum Ratings
Recommended Operating Conditions
Parameter
Symbol
VCC
Min
10
Max
Unit
VCC DC supply voltage
30
70
85
V
Oscillation frequency
fOSC
60
kHz
°C
Operating Temperature Range
TOP
-40
Table 3. Recommended Operating Conditions
December, 2013 Rev. 1.1
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Datasheet
Electrical Characteristics (Ta=25°C, unless otherwise specified)
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Supply Voltage (VCC)
VCC =12.5V, RI=100k,Measure
Leakage current into VCC
VCC=16V,
VCC start up current
ISTARTUP
-
3
20
uA
Operation current
ICC
-
1.6
7.5
14.5
32
-
mA
V
RI=100k, VFB=3V
VCC under voltage lockout enter
VUVLO(ON)
VUVLO(OFF)
VCC_CLAMP
-
6.5
13.5
30
8.5
15.5
34
VCC under voltage lockout exit
(recovery)
-
V
VCC zener clamp voltage
IVCC=10mA
V
Feedback Input Section(FB Pin)
FB open loop voltage
VFB_OPEN
-
-
-
4.2
0.4
-
-
V
Short FB pio GND and
Measure Current
FB pin short circuit current
IFB_SHORT
VTH_0D
VTH_PL
mA
Zero duty cycle fb threshold
voltage zero
VCC=16V
-
-
-
0.85
4.1
V
V
Power limiting FB threshold
voltage
3.3
3.7
Power limiting debounce time
The threshold enter burst mode
The threshold exit burst mode
tD_
-
-
-
-
-
-
90
1.1
1.2
-
-
-
ms
V
V-Burst-L
V-Burst-H
V
Current Sense Input(Sense Pin)
Over current threshold voltage
at zero duty cycle
VSENSE-th
FB=3.3V
0.70
0.75
0.80
V
VSENSE-
-CLAMP
tLEB
SENSE camp voltage
-
-
-
-
-
-
0.95
300
75
-
-
-
V
Ledge blanking time
ns
ns
Over current detection and
control delay
tPD
OTP/OVP Protection (PRO PIN)
Normal oscillation frequency
Shuffling frequency frequency
Burst mode base frequency
fOSC
fShuffling
fGreen
-
60
-3
65
22
70
+3
kHz
%
-
VCC= 16V
kHz
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Datasheet
Parameter
Symbol
Condition
Min
Typ
80
-
Max
90
5
Unit
%
Maximum duty cycle
DMAX
fDV-TEMP
fDV-VCC
VPRO
VCC=16V, FB=3V, CS=0
70
Frequency temperature stability
Frequency voltage stability
PRO open load voltage
PRO low protection voltage
PRO high voltage protection
Soft start time
VCC=16V, Ta= -20°C to 100 °C
-
-
%
VCC=12V~25V,
-
5
%
-
-
2.5
1.0
4.0
4
-
V
VL-TH
-
0.95
3.7
3
1.05
4.3
5
V
VH-TH
tsoft
-
-
V
ms
Gate Drive Output
VCC=16V, IO=-20m
VCC=16V, IO=20mA
Output low level
VOL
VOH
VCLAMP
tr
-
10
-
-
-
0.8
V
V
Output high level
-
-
-
-
Output clamp voltage level
Output rising time
Output falling time
14
125
40
V
VCC =16V, CL =1nf
VCC=16V, CL=1nf
-
ns
ns
tf
-
Table 4. Electrical Characteristics
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Datasheet
Function Description
The SDC4566 is a highly integrated PWM controller IC
optimized for offline flyback converter applications in
sub 60W power range. The extended burst mode control
greatly reduces the standby power consumption and
helps the design easily meet the international power
conservation requirements.
the loading condition. Under no load to light/medium
load condition, the FB input drops below burst mode
threshold level, Device enters Burst Mode control. The
gate drive output switches only when VDD voltage drops
below a preset level and FB input is active to output an
on state, otherwise the gate drive remains at off state to
minimize the switching loss and reduces the standby
power consumption to the greatest extend. The
frequency control also eliminates the audio noise at any
loading condition
Startup Current and Start up Control
Startup current of SDC4566 is designed to be very low so
that VCC could be charged up above UVLO threshold
level and device starts up quickly. A large value startup
resistor can therefore be used to minimize the power
loss yet provides reliable startup in application.
Oscillator ation
It can typically operate at built-in 65kHz center
fquency and features frequency jittering function. Its
jittering depth is ±3% with about 4ms envelope
frequency at 65kHz.
Operating Current
The Operating current of SDC4566 is low at 1.8mA. Good
efficiency is achieved with SDC4566 low operating
current together with extended burst mode control
features.
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in SDC4566
current mode PWM control. The switch current is
detected by a sense resistor into the sense pin. An
internal leading edge blanking circuit chops off the sense
voltage spike at initial MOSFET on state due to Snubber
diode reverse recovery so that the external RC filtering
on sense input is no longer required. The current limit
comparator is disabled and thus cannot turn off the
external MOSFET during the blanking period. PWM duty
cycle is determined by the current sense input voltage
and the FB input voltage.
Frequency shuffling for EMI improent
The frequency Shuffling/jittering (switching frequency
modulation) is implemented in SDC4566. The oscillation
frequency is modulated with a random source so that
the tone energy is sout. The spread spectrum
minimizes the conduction band EMI and therefore
reduces system design challenge.
Extended Burst Mode Operation
Undo load or light load condition, ment of the
power dissipation in a switching mode power supply is
from switching loss on the MOSFET transistor, the core
loss of the transformer and the loss on the snubber
circuit. The magnitude of power loss is in proportion to
the number of switching events within a fixed period of
time, Reducing switching freque leads to the reduction
on power loss and thus conserves the energy.
Internal Synchronized Slope Compensation
Built-in slope compensation circuit adds voltage ramp
onto the current sense input voltage for PWM
generation. This greatly improves the close loop stability
at CCM and prevents the sub-harmonic oscillation and
thus reduces the output ripple voltage.
Gate Drive
SDC4566 self adjusts the switching mode according to
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Datasheet
SDC4566 gate is connected to an external MOSFET gate
for power switch control. Too weak the gate drive
strength results in higher conduction and switch loss of
MOSFET while too strong gate drive output
compromises the EMI. A good tradeoff is achieved
through the built-in totem pole gate design with right
output strength and dead time control. The low idle loss
and good EMI system design is easier to achieve with
this dedicated control scheme. An internal 14V clamp is
added for MOSFET gate protection at higher than
expected VCC input.
Protection Controls
Good power supply system reliability is achieved with its
rich protection features in- cluding cyce-by-cycle current
limiting (OCP), Over Load Protection (OLP) and over
voltage clamp, Under Voltage Lockout on VCC (UVLO).
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Datasheet
Typical Performance Characteristics
15.0
14.9
14.8
14.7
14.6
14.5
14.4
14.3
7.8
7.7
7.6
7.5
7.4
7.3
-40 -20
0
20
40
60
80 100 120 140
-40 -20
0
20
40
60
80 100 120 140
Temperature(°C)
Temperature(°C)
Figure 4. VUVLO-OFF(V) vs. Temperature(℃)
Figure 5ON(V) vs. Temperature(℃)
2.50
67
66
65
64
63
2.40
2.35
2.30
2.25
2.20
-40 -20
0
20 40 60 0 120 140
-40 -20
0
20 40 60 80 100 120 140
Temperature(°C)
Temperature(°C)
Figure 6. fOSC(kHz) vs. Temperature(℃)
Figure 7. VPRO(V) vs. Temperature(℃)
3.9
3.8
3.7
3.6
3.5
3.4
3.3
101.75
101.25
100.75
25
99.75
-40 -20
0
20 40 60 80 100 120 140
-40 -20
0
20 40 60 80 100 120 140
Temperature(°C)
Temperature(°C)
Figure 8. IPRO(mA) vs. Temperature(℃)
Figure 9. VFB_OLP(V) vs. Temperature(℃)
December, 2013 Rev. 1.1
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特性曲线(接上)
1.68
1.68
1.67
1.67
1.66
1.66
1.65
-40 -20 0 20 40 60 80 100 120 140
Temperature(°C)
Figure 10. ICC-OP(mA) vs. Temperature(℃)
December, 2013 Rev. 1.1
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Datasheet
Typical Application
V+
GND
GND GATE
VCC
FB
PRO
SENSE
SDC4566
Figure 11. Typical Application
December, 2013 Rev. 1.1
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Datasheet
Package Dimension
SOT-23-6
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
1.250
0.100
1.150
0.500
0.200
3.020
1.700
2.950
Min
Max
0.049
0.004
0.045
0.020
0.008
0.119
0.067
0.116
A
A1
A2
b
1.050
0.000
1.050
0.300
0.100
2.820
1.500
2.650
0.041
0000
0.041
0.012
0.004
0.111
0.059
0.104
c
D
E
E1
e
0.950(BSC)
0.037(BSC)
e1
L
1.800
0.300
0°
2.000
0.600
8°
0.071
0.012
0°
0.079
0.024
8°
θ
December, 2013 Rev. 1.1
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Datasheet
Shaoxing Devechip MicroelectronicCo., Ltd.
http://www.sdc-si.com/
IMPORTANT NOTICE
Information in this documprovided solely in connection with Shaoxing Devechip Microelectronics Co., Ltd. (abbr. SDC) products.
SDC reserves the right to mhanges, corrections, modifications or improvements, to this document, and the products and services
described herein aanytime, without notice. SDC does not assume any responsibility for use of any its products for any particular
purpose, nor does SDC assume any liability arising out of the application or use of any its products or circuits. SDC does not convey
any license under its patent rights or other rights nor the rights of others.
© 2013 Devechip Microelectronics - All rights reserved
Contact us:
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Address: Tian Mu Road, No13,
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Zip code: 312000
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Address: 22A, Shangbu building, Nan Yuan Road, No.68,
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Zip code: 518031
Tel: (86) 0575-8861 6750
Tel: (86) 0755-8366 1155
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