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PDF SDC3844 Data sheet ( Hoja de datos )
| Número de pieza | SDC3844 | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | SDC | |
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Current Mode PWM Controller
Datasheet
SDC3842/3843/3844/3845
General Description
Features
The SDC384X are high performance fixed frequency
current-mode PWM controller series. These integrated
Tcircuits are optimized for off-line and DC-DC converter
Napplications with minimum external components. They
Efeature under-voltage lockout (UVLO) circuit with low
start-up current, trimmed oscillator for precise duty
Mcycle control, current sense comparator providing
maximum current limiting and a totem pole output
Ustage for increasing output current. In addition, these
CICs also feature accurate protection against
over-temperature, over-current and maximal output
Opower.
DThe SDC3842 and SDC3844 have UVLO thresholds of
L16V(ON) and 10V(OFF); The corresponding thresholds
IAfor SDC3843 and SDC3845 are 8.4V(ON) and 7.6V(OFF).
The SDC3842 and SDC3843 can operate approaching
T100% duty cycle; SDC 3844 and SDC3845 can operate
CONFIDENfrom zero to 50% duty cycle.
Start-up current: 0.15mA
Low line regulation: 4mV
Low load regulation: 4mV
Operating frequency up to 500kHz
High PWM frequency stability over a full
temperature range: 2.5%
High PWM frequency stability under a full supply
voltage range: 0.2%
Accurate over-temperature
Protection with hysteresis
UVLO with hysteresis
Package: SOP-8, DIP-8
Applications
Off-line converter
DC-DC converter
Voltage adapter
CRT monitor power supply
DVD/STB power supply
SDC
DIP-8
SOP-8
Figure 1. Package Type
December, 2013 Rev. 1.2
©2013 Shaoxing Devechip Microelectronics Co., Ltd.
1/12
www.sdc-semi.com
1 page  
Current Mode PWM Controller
Datasheet
SDC3842/3843/3844/3845
Absolute Maximum Ratings (NOTE: Stresses greater than those listed under Absolute Maximum Ratings may cause
permanent damage to the device.)
Parameter
Symbol
Value
Unit
Supply voltage
TOutput current
Analog inputs (pin2/pin3)
NError amp output sink current
EPower dissipation at Ta< 25°C (DIP-8)
MPower dissipation at Ta<25°C (SOP-8)
UOperating Junction Temperature
Storage temperature
CLead temperature (soldering, 10s)
OLatch-up test per JEDEC 78
DESD, HBM model per Mil-Std-883, Method 3015
LESD, MM model per JEDEC EIA/JESD22-A115
V CC
IO
VA
I SINK
PD
PD
TJ
T STG
T LEAD
-
HBM
MM
IATable 2. Absolute Maximum Ratings
TRecommended Operating Conditions
Parameter
NOscillation frequency
EOperating temperature
Symbol
f OSC
Ta
Min
50
-40
CONFIDTable 3. Recommended Operating Conditions
30
±1
-0.3~6.3
10
1000
460
-40~150
-55~150
260，10s
200
2000
200
Max
200
85
V
A
V
mA
mW
mW
°C
°C
°C
mA
V
V
Unit
kHz
°C
SDC
December, 2013 Rev. 1.2
©2013 Shaoxing Devechip Microelectronics Co., Ltd.
5/12
www.sdc-semi.com
5 Page 
Current Mode PWM Controller
Datasheet
SDC3842/3843/3844/3845
SOP-8
Symbol
A
A1
NFIDENTIAL DOCUMENTDimensionsInMillimeters
Min Max
O 1.350
1.750
C 0.100
0.250
Dimensions In Inches
Min Max
0.053
0.069
0.004
0.010
A2
Cb
c
SDD
1.350
0.330
0.170
4.700
1.550
0.510
0.250
5.100
0.053
0.013
0.007
0.185
0.061
0.020
0.010
0.201
e 1.270(BSC)
0.050(BSC)
E
5.800
6.200
0.228
0.244
E1
3.800
4.000
0.150
0.157
L
0.400
1.270
0.016
0.050
θ 0° 8° 0° 8°
December, 2013 Rev. 1.2
©2013 Shaoxing Devechip Microelectronics Co., Ltd.
11/12
www.sdc-semi.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SDC3844.PDF ] | |
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