SC2608B PDF даташит
Спецификация SC2608B изготовлена «Semtech Corporation» и имеет функцию, называемую «Synchronous Voltage Mode PWM Controller». |
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Детали детали
Номер произв | SC2608B |
Описание | Synchronous Voltage Mode PWM Controller |
Производители | Semtech Corporation |
логотип |
11 Pages
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POWER MANAGEMENT
DDreasfctription
The SC2608B is a versatile voltage-mode PWM control-
ler designed for use in step down DC/DC power supply
applications. A simple, fixed frequency, highly efficient
buck regulator can be implemented using the SC2608B
with minimal external components. The input voltage
range is from +5V to +12V. Internal level shift and drive
circuitry eliminates the need for an expensive P-channel,
high-side MOSFET. The small device footprint allows for
www.DatacSohemetp4aUc.ctomcircuit design.
SC2608B features include temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator, and an externally compensated error ampli-
fier. Current limit is implemented by sensing the voltage
drop across the bottom MOSFET RDS(ON).
The SC2608B operates at a fixed frequency of 250kHz
providing an optimum compromise between efficiency ,
external component size, and cost.
SC2608B has a thermal protection circuit, which is
activated if the junction temperature exceeds 150 OC.
SC2608B
Simple, Synchronous
Voltage Mode PWM Controller
Features
+5V or +12V input voltage
250kHz operation
High efficiency (>90%)
1.25% Voltage feedback accuracy over tempera-
ture
Hiccup mode over current protection
1.2A output drive
RDS(ON) Current sensing for protection
Industrial temperature range
Available in SO-8 package
Integrated boot strap diode
Thermal Shut down
Fully WEEE and RoHS Compliant
Applications
Termination supplies
Low cost microprocessor supplies
Peripheral card supplies
Industrial power supplies
High density DC/DC conversion
Typical Application Circuit
Revision 4: Jan. 2007
Figure 1
1
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SC2608B
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
VCC to GND
BST to PHASE
+20 V
+15 V
BST to GND
+20 V
PHASE to GND (note1)
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DH to PHASE (note1)
-1 to +24
+15
V
V
DL to GND (note2)
-1 to +15
V
COMP/SS to GND
+7 V
SENSE to GND
+7 V
Thermal Resistance Junction to Case (SO-8)
Thermal Resistance Junction to Ambient (SO-8)
Operating Temperature Range
Storage Temperature Range
ESD Rating (Human Body Model)
θJC 40 OC/W
θJA 120 OC/W
TJ
-40 to +125
OC
TSTG
-65 to +150
OC
ESD 4 kV
Note 1: Under pulsing condition, the peak negative voltage can not be lower than -3.6V with less than 20nS from 50% to 50%.
Note 2: Under pulsing condition, the peak negative voltage can not be lower than -5V with less than 20nS from 50% to 50%.
Electrical Characteristics
Unless specified: VCC = 12V, VBST - VPhase = 12 V, VOUT = 3.3V, TJ = TA = 25oC.
Parameter
Symbol
Conditions
Min Typ
Max
Power Supply
Supply Voltage
Supply Current
Under voltage Lockout
VCC
ICC
VCOMP < 0.4V
4 14
6 6.5
UVLO Threshold
Hysteresis
Error Amplifier
Vth
Vhys
0< TJ < 85OC
3.75
80
3.85
Feedback Voltage
V FB
4.5V<Vcc<5.5V
0OC < TA < 85 OC
10.8V<Vcc<13.2V
0OC < TA < 85 OC
0.787 0.797 0.807
0.79
0.8
0.81
Units
V
mA
V
mV
V
V
© 2007 Semtech Corp.
2
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POWER MANAGEMENT
Electrical Characteristics
Unless specified: VCC = 12V, VBST - VPhase = 12 V, VOUT = 3.3V, TJ = TA = 25oC.
Parameter
Symbol
Conditions
E/A Transconductance
Open Loop DC Gain
Input Bias Current
Output Sink Current
www.DataSOheuetpt4uUt.cSoomurce Current
Oscillator
Gm
AO
IFB
ISINK
ISOURCE
VSENSE > 0.9V; VCOMP = 2.1V
VSENSE < 0.7V; VCOMP = 2.1V
Switching Frequency
Ramp Peak Voltage
Ramp Valley Voltage
Maximum Duty Cycle
MOSFET Drivers
FOSC
VP-K
VV
DMAX
Vcc =12V
4.75V < VCC < 12.6V
4.75V < VCC < 12.6V
DH Sink/Source Current
DL Sink/Source Current
IDH
IDL
tPW > 400nS
VGS = 4.5V (src)
VGS = 2.5V (snk)
DH Rise/Fall Time
DL Rise/Fall Time
Dead Time
DL Minimum On Time
Current Limit
Trip Voltage
Sof t-Star t
SS Source Current
SS Sink Current
Thermal Shutdown
Over Temperature Trip Point
tr, tf
tr, tf
tdt
tON
VTRIP
ISRC
ISNK
TOTP
CL = 3000pF, See Fig. 2
CL = 4000pF, See Fig. 2
See Fig. 2
4.75V < Vcc < 12.6V
4.75V < Vcc < 12.6V
Vtrip = VPHASE - GND
VCOMP < 2.5V
VCOMP > 0.5V
SC2608B
Min Typ
7
60
1
-800
120
Max
3
Units
mS
dB
uA
uA
uA
225 250 275 kHz
1.8 V
0.8 V
85 %
1.2 A
1.2 A
50 ns
50 ns
65 ns
440 ns
-575
-500
-425
mV
4 uA
-4 uA
150
oC
© 2007 Semtech Corp.
3
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Номер в каталоге | Описание | Производители |
SC2608 | Synchronous Voltage Mode PWM Controller | Semtech Corporation |
SC2608A | Synchronous Voltage Mode PWM Controller | Semtech Corporation |
SC2608B | Synchronous Voltage Mode PWM Controller | Semtech Corporation |
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