SC4806 PDF даташит
Спецификация SC4806 изготовлена «Semtech Corporation» и имеет функцию, называемую «Multiple Function Double Ended PWM Controller». |
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Детали детали
Номер произв | SC4806 |
Описание | Multiple Function Double Ended PWM Controller |
Производители | Semtech Corporation |
логотип |
22 Pages
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POWER MANAGEMENT
Description
The SC4806 is a double ended, high speed, highly
integrated PWM controller optimized for applications
requiring minimum space. The device is easily configurable
for current mode or voltage mode operation and contains
all the control circuitry required for isolated applications,
where a secondary side error amplifier is used.
Designed for simplicity, the SC4806 is fully featured and
requires only a few external components. It features a
programmable frequency up to 1MHZ, external
www.DatapShroeegt4raUm.commable soft start, pulse-by-pulse current limit and
over current protection for both voltage and current
modes, as well as a line monitoring input with hysteresis
to reduce stress on the power components. A ramp pin
allows for slope compensation to be programmed by
external resistors for current mode. This also allows for
operation in voltage mode with voltage feed forward.
A unique oscillator is utilized which allows two SC4806
to be synchronized together and work out-of-phase. This
feature minimizes the input and output ripples, and
reduces stress and size on input/output filter components.
The outputs are configured for push-pull format, dead time
between the 2 outputs is programmable depending on the
size of the timing components.
The SC4806 features a turn on threshold of 8 volts .
The device is available at a MLP-12 package.
Typical Application Circuit
SC4806
Multiple Function
Double Ended PWM Controller
Features
90 µA starting current
Pulse-by-pulse current limit for both voltage/current
modes
Programmable operating frequency up to 1MHz
Programmable external soft start
Programmable line undervoltage lockout
Programmable external slope compensation
Over current shutdown with separate pin
Dual output drive stages on push-pull configuration
Programmable mode of operation (peak current mode
or voltage mode)
External frequency synchronization
Bi-phase mode of operation
Lead free MLP-12 package,WEEE and RoHS
compliant
-40 to 105 °C operating temperature
Applications
Telecom equipment and power supplies
Networking power supplies
Industrial power supplies
Push-pull converter
Half bridge converter
Full bridge converter
Isolated VRMs
+VIN
-VIN
ON/OFF
REF
+
SYNC
4 RC
5 ILIM
6 RAMP
I sense
Vcc
SC4806
Vcc
VCC 12
OUTA 11
OUTB 10
Rsense
SC1301A
SC1301A
+
REF
FB
SC431
+Vo
-Vo
Revision: October 13, 2006
REF
FB
I sense
1
www.semtech.com
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SC4806
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
SYNC, RC,RAMP, LUVLO, REF, ILM, SS to GND
VCC
ICC
-0.5 to18
20
-0.5 to 7
V
mA
V
FB to GND
www.DataSRheEeFt4UC.cuormrent
OUTA/OUTB to GND
OUTA/OUTB Source Current (peak)
OUTA/OUTB Sink Current (peak)
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Case
Junction Temperature
Storage Temperature Range
Peak IR Reflow Temperature 10 - 40s
ESD Rating (Human Body Model)
VFB
IREF
VOUTA/B
Isource
Isink
θJA
θJC
TJ
TSTG
TPKG
ESD
-0.5 to (VREF+ 0.5)
10
-0.5 to 18
-250
250
32
3
-55 to 150
-65 to 150
260
2
V
mA
V
mA
mA
°C/W
°C/W
°C
°C
°C
kV
Electrical Characteristics
Unless specified: VCC = 12V; CL = 100pF; TA = -40°C to 105°C
Parameter
Test Conditions
45455
Min Typ
Max Units
VCC Supply
VCC Start Threshold
Hysteresis
Startup Current
Operating Supply Current
VCC Zener Shunt Voltage
VCC < start threshold
FB = 0V, RAMP = 0V
IDD = 10mA
7.4
1.17
16
8 8.6 V
1.5 1.83 V
150 µA
7 mA
V
PWM
Maximum Duty Cycle
Minimum Duty Cycle
Current Sense/Limit
Fosc = 50kHz, FB = 5V,
Measured at OUTA or OUTB
Fosc = 50kHz, FB = 1.5V,
Measured at OUTA or OUTB
48
49 50 %
0%
ILM Cycle by Cycle Current Limit Threshold
ILM to Output Delay
ILM Auto Restart Over Current Threshold
FB to RAMP Offset
450
750
1.20
525 600 mV
50 ns
850 950 mV
1.40 1.60 V
2006 Semtech Corp.
2
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POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VCC = 12V; CL = 100pF; TA = -40°C to 105°C
Parameter
Test Conditions
Line Under Voltage Lockout
Start Threshold
Rhigh = 14kΩ, Rlow = 10kΩ
Hysteresis
Rhigh = 14kΩ, Rlow = 10kΩ
Soft Start
www.DataSIhneteetr4nUa.lcoSmoft Start Charge
Current (ISS)
Internal Discharge Current
Oscillator
Oscillator Frequency
Oscillator Ramp
VSS = 1.5V
VSS = 1.5V
Rosc = 10kΩ, Cosc = 200pF
Oscillator Fall Time
RC pin to GND Capacitance
Oscillator Frequency Range
Sync/CLOCK
Clock SYNC Threshold
Sync Frequency Range
Bandgap
ReferenceVoltage
Reference Load Regulation
Reference Line Regulation
Output
OUT Low Level
OUT High Level
Rise Time
Fall Time
Minimal Dead Time
Thermal Shutdown
Thermal Shutdown
Threshold TSD
Thermal Shutdown
Hysteresis
2006 Semtech Corp.
Guaranteed by characterization
Guaranteed by characterization
Guaranteed by characterization
IREF = 0 - 5mA
VCC = 8.5V to 15V
VCC = 12V
Load 1nF
Load 1nF
3
SC4806
Min Typ
Max Unit
-3% VREF
5.5% of
VREF
+3%
V
mV
25 35
10
45 µA
µA
450 500
VREF/2
+0.25
200
22
50
550
250
1000
KHz
V
ns
pF
KHz
4.75
1.75
FOSC *1.3
V
KHz
5.0 5.25 V
10 mV/mA
0.3 mV/V
10.85
0.5
11.20
35
35
200
0.7
250
V
V
ns
ns
ns
175 °C
15 °C
www.semtech.com
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