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SC4809A PDF даташит

Спецификация SC4809A изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «High Performance Current Mode PWM Controller».

Детали детали

Номер произв SC4809A
Описание High Performance Current Mode PWM Controller
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC4809A Даташит, Описание, Даташиты
POWER MANAGEMENT
Description
SC4809A/B/C
High Performance Current Mode
PWM Controller
Features
The SC4809A/B/C is a 10 pin BICMOS primary side
current mode controller for use in Isolated DC-DC and
off-line switching power supplies. It is a highly integrated
solution, requiring few external components. It features
a high frequency of operation, accurately programmable
maximum duty cycle, current mode control, line voltage
monitoring, supply UVLO, low start-up current, and
programmable soft start with user accessible reference.
www.DataIStheoept4eUr.acotmes in a fixed frequency, highly desirable for
Telecom applications. Features a separate sync pin which
simplifies synchronization to an external clock. Feeding
the oscillator of one device to the sync of another forces
biphase operation which reduces input ripple and filter
size.
The SC4809A/B/C have different threshold and VREF
to accommodate a wide variety of applications.
These devices are available in the MSOP–10 lead free
package.
‹ Operation to 1MHz
‹ Accurate programmable maximum duty cycle
‹ Line voltage monitoring
‹ External frequency synchronization
‹ Bi-phase mode of operation for low ripple
‹ Under 100µA start-up current
‹ Accessible reference voltage
‹ VDD undervoltage lockout
‹ -40°C to 105°C operating temperature
‹ 10 lead MSOP package. Lead free package available.
Fully WEEE and RoHS compliant
Applications
‹ Telecom equipment and power supplies
‹ Networking power supplies
‹ Power over LAN applications
‹ Industrial power supplies
‹ Isolated power supplies
Typical Application Circuit
+48V
C1
R1 R2
U1
SC4809
1 VDD
VREF 10
R3
2 LUVLO
OUT 9
SYNC
3 SYNC
GND 8
4 RCT
FB 7
5 DMAX
SS 6
C7
R4
-- 48V
R5
R6 R7
C3 R8
Q1
C2
C4 C5 C6
DISABLE
T1
D1
U2
SC1301
1 IN
2 GND
3 VCC
EN 5
OUT 4
R9
Q2
R10
R11
D2
C8 Vout
R12 R13
U3
U4
SC4431
C9
R14
Revision: September 21, 2005
1
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SC4809A Даташит, Описание, Даташиты
SC4809A/B/C
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied.
Parameter
Symbol
Maximum
Units
Supply Voltage
Supply Current
SS, UVLO, DMAX, RCT
Current VREF
www.DataSCheuertr4eUn.tcoLmUVLO
Storage Temperature Range
Junction Temperature
Thermal Resistance
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human body model)
VDD
IDD
IREF
ILUVLO
TSTG
TJ
θJA
TLEAD
ESD
19
25
-0.3V to VREF + 0.3V
15
-1
-65 to +150
-40 to +150
113
+300
2
Electrical Characteristics
Unless specified: VDD = 12V, CSS =1nF, FOSC = 500kHz, RT = 10K, CT = 100pF, DMAX = 2V, TA = TJ = -40ºC to +105ºC.
Parameter
Test Conditions
Min Typ
V
mA
V
mA
mA
°C
°C
°C/W
°C
kV
Max Unit
Supply Section
VDD Clamp
IDD
IDD Starting
UVLO Section (A version)
B version
16 17.5 19 V
1.5 2.5 mA
110 µA
Start Threshold
4.35 4.5 V
Hysteresis
0.3 V
UVLO Section (B version)
Start Threshold
11 12 V
Hysteresis
4V
UVLO Section (C version)
Start Threshold
6.55 6.95 V
Hysteresis
0.75 V
VREF Section
VREF (A version)
0 - 5mA
-3%
4
+3%
V
VREF (B, C version)
0 - 5mA
-3%
5
+3%
V
2005 Semtech Corp.
2
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SC4809A Даташит, Описание, Даташиты
SC4809A/B/C
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VDD = 12V, CSS =1nF, FOSC = 500kHz, RT = 10K, CT = 100pF, DMAX = 2V, TA = TJ = -40ºC to +105ºC.
Parameter
Test Conditions
Min Typ
Line Under Voltage Lockout
Start Threshold
Hysteresis
Input Bias Current
RA = 61.9k, RB = 10k
RA = 61.9k, RB = 10k
LUVLO = 3.2V
-3% 3
150
-100
www.DataSCheoemt4Up.acormator Section
IFB
Output Off
-100
Comparator Threshold (A, B version)
570 600
Comparator Threshold (C version)
950 1000
OUT Propagation Delay (No Load)
Soft Start Section
VFB = 0.8V to 1.2V at TR = 10ns
75
ISS
Shutdown Threshold (A, B version)
VSS = 0V; -40 °C <Ta +105°C
-2
300 340
Shutdown Threshold (C version)
440 500
Oscillator Section
Frequency range
50
RCT Peak Voltage
3.00
RCT Valley Voltage
0.05
Minimum Duty Cycle Pulse Width
Maximum Duty Cycle
VFB = 2V
50
90
Sync/CLOCK
Clock SYNC Threshold
Positive Edge Triggered
2.1
Minimum Sync Input Pulse Width
Output Section
FSYNC > Fosc
Output VSAT Low
Output VSAT High
Rise Time
Fall Time
IOUT = 1mA
IOUT = 1mA
COUT = 20pF
COUT = 20pF
VREF - 0.5
10
10
Max
-3%
-250
630
1050
100
-8.0
1100
50
500
25
25
Unit
V
mV
nA
nA
mV
mV
ns
µA
mV
mV
kHz
V
V
ns
%
V
ns
mV
V
ns
ns
2005 Semtech Corp.
3
www.semtech.com










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Номер в каталогеОписаниеПроизводители
SC4809AHigh Performance Current Mode PWM ControllerSemtech Corporation
Semtech Corporation
SC4809BHigh Performance Current Mode PWM ControllerSemtech Corporation
Semtech Corporation
SC4809CHigh Performance Current Mode PWM ControllerSemtech Corporation
Semtech Corporation

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