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SC4810B PDF даташит

Спецификация SC4810B изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «High Performance Current Mode PWM Controller».

Детали детали

Номер произв SC4810B
Описание High Performance Current Mode PWM Controller
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC4810B Даташит, Описание, Даташиты
POWER MANAGEMENT
Description
SC4810B/E
High Performance Current Mode PWM Controller
with Complementary Output, Programmable Delay
Features
The SC4810B/E is a 16 pin BICMOS primary side PWM
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. It operates in a fixed
www.DatafSrheeqeut4eUn.ccoym, highly desirable for Telecom applications. The
output for switch is complementary to each other with
programmable delay between each transition. The active
technique allows single ended converters beyond 50%
duty cycle and greater flux swing for the power
transformer while reducing voltage stresses on the
switches. The separate sync pin 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 SC4810B/E has a turn-on voltage threshold of 7V.
In the SC4810B, OUT2 is inverted to drive the N-MOSFET.
In the SC4810E, OUT2 is non-inverted to drive the
P-MOSFET. These devices are available in a TSSOP-16 or
MLPQ-16 lead package.
‹ Operation to 1MHz
‹ Accurate programmable maximum duty cycle
‹ Line voltage monitoring
‹ External frequency synchronization
‹ Bi-phase mode of operation for low ripple
‹ Independent programmable delays
‹ Hiccup mode current limit
‹ Under 250µA start-up current
‹ Programmable maximum volt-second clamp
‹ Accessible reference voltage
‹ VDD undervoltage lockout
‹ -40°C to 105°C operating temperature
‹ 16 lead TSSOP or MLPQ lead free packages. Both
fully WEEE and RoHS compliant
Applications
‹ Telecom equipment and power supplies
‹ Networking power supplies
‹ Power over LAN applications
‹ Industrial power supplies
‹ Isolated power supplies
‹ VoIP phones
Typical Application Circuit
+48V
R1
C1
D2 Q1
D1
C3
R2
C4
C5
T1
D3
D4
C7
R3 U1 T2
S C 130 2A
R5 C9 R6
C8
U2
2
R7
7
C10
6 RAMP
OUT2 13 4
5
R9
3 SYNC
OUT1 15
R10
4 RCT SC4810
CS 10
R 11
5 DMAX
R12
7 DELAY 1
R 14
C13 8 DELAY 2
Q4
R17 R18 R19
FB 11
VREF 16
SS
9 C12
C 15
C 11
R 20
R22
C6
R4
Q2
D5
Q3
R 13
U3
6
5
1
2
R23 C16
L1
C2
R8
R15
U4
SC 431L
C14
Vout
R16
R21
Revision: July 27, 2006
1
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SC4810B Даташит, Описание, Даташиты
SC4810B/E
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. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device
reliability.
Parameter
Symbol
Maximum
Units
Supply Voltage
Supply Current
LUVLO
SS, DMAX, RCT, FB, CS, RAMP, SYNC
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Current VREF
Current LUVLO
Storage Temperature Range
Junction Temperature Range
Lead Temperature (Soldering) 10 Sec.
Peak IR Reflow Temperature 20 - 40 Sec.
VDD
IDD
VLUVLO
IREF
ILUVLO
TSTG
TJ
TLEAD
TPKG
19
25
10
-0.3V to VREF + 0.3V
15
-1
-65 to +150
-40 to +150
300
260
V
mA
V
V
mA
mA
°C
°C
°C
°C
Electrical Characteristics
Unless specified: VDD = 12V, CSS = 1nF, FOSC = 420kHz, RT = 10k, CT = 220pF, DMAX = 2V, RDELAY = 75k, TA = TJ = -40ºC to 105ºC
Parameter
Test Conditions
Min Typ Max
Unit
Supply Section
Supply Voltage
15 V
IDD
IDD Shutdown
Ramp Section
VDD = 15V, NO LOAD
SS = 0V
3.5 4.5 mA
100 250 µA
Ramp Clamp Threshold Voltage
3V
UVLO Section (B/E version)
Start Threshold
8 8.4 8.8 V
Hysteresis
2V
2006 Semtech Corp.
2
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SC4810B Даташит, Описание, Даташиты
SC4810B/E
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VDD = 12V, CSS = 1nF, FOSC = 420kHz, RT = 10k, CT = 220pF, DMAX = 2V, RDELAY = 75k, TA = TJ = -40ºC to 105ºC
Parameter
Test Conditions
Min Typ Max
VREF Section
VREF (B/E version)
0 - 5mA
4.85 5 5.15
Line Under Voltage Lockout
Start Threshold
2.91 3 3.09
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Input Bias Current(1)
LUVLO = 3.2V
150
-100
Comparator Section
CS Input Current(1)
-200
PWM to OUT Propagation Delay
(No Load)(1)
75
Current Limit Section
Current Limit Threshold
590 625 660
ILIM to OUT Propagation Delay(1)
Soft Start Section
75
ISS
Shutdown Threshold
VSS = 0V
-2.5 -5 -7.5
500
Oscillator Section
Frequency Range (2)
50 1100
RCT Peak Voltage
3.00
RCT Valley Voltage
0.05
Maximum Duty Cycle
DMAX = 2.8V, OUT1
85
Maximum Duty Cycle
DMAX = 1.25V, OUT1
29
Frequency
380 420 460
Sync/CLOCK
Clock SYNC Threshold
Positive Edge Triggered
2
Minimum Sync Input Pulse Width(1)
FSYNC > Fosc
50
Unit
V
V
mV
nA
nA
ns
mV
ns
µA
mV
kHz
V
V
%
%
kHz
V
ns
2006 Semtech Corp.
3
www.semtech.com










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Номер в каталогеОписаниеПроизводители
SC4810BHigh Performance Current Mode PWM ControllerSemtech Corporation
Semtech Corporation
SC4810EHigh Performance Current Mode PWM ControllerSemtech Corporation
Semtech Corporation

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