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Спецификация SC1104A изготовлена «Semtech Corporation» и имеет функцию, называемую «(SC1104A/B) Synchronous Voltage Mode PWM Controller». |
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Детали детали
Номер произв | SC1104A |
Описание | (SC1104A/B) Synchronous Voltage Mode PWM Controller |
Производители | Semtech Corporation |
логотип |
14 Pages
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POWER MANAGEMENT
Description
SC1104A/B
Simple, Synchronous
Voltage Mode PWM Controller
Features
The SC1104A/B is a versatile voltage-mode PWM con-
troller designed for use in single ended DC/DC power
supply applications. A simple, fixed frequency high effi-
ciency buck regulator can be implemented using the
SC1104A/B with a minimum of external components.
Internal level shift and drive circuitry eliminates the need
for an expensive P-channel, high-side switch. The small
device footprint allows for compact circuit design.
SC1104A/B 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 top FET’s RDS(ON).
The SC1104 operates at fixed frequencies of
300kHz(A) or 600kHz(B) providing an optimum com-
promise between efficiency, external component size,
and cost. 600kHz switching frequency is reserved for
the SC1104B, +5VCC operation only.
Up to +14V input, 300kHz operation (SC1104A)
Up to +7V input, 600kHz operation (SC1104B)
High efficiency (>90%)
1% Reference voltage accuracy
Hiccup mode over current protection
Robust output drive
RDS(ON) Current sensing
Industrial temperature range
8-Lead SOIC package. Pb-free package available,
fully WEEE and RoHS compliant
Applications
Termination supplies
Low cost microprocessor supplies
Peripheral card supplies
Industrial power supplies
High density DC/DC conversion
SC1104A/B has a thermal protection circuit, which is
activated if the junction temperature exceeds 150°C.
Typical Application Circuit
Typical Distributed Power Supply
C1
510-1500pF
R1 C2
200-2k 0.01
1
U1
SC1104A/B
COMP/SS
SENSE
C3
1
8
2 GND
VCC 7
D1
MBRA130L
R3
1.00k
3 DL
PHASE
6
4 DH
BST 5
Q1
R6
1-5.1
Si4884DY
R7 Q2
1-5.1 Si4874DY
C9
0.1
D2
(opt)
R4
2.32k
+
C4 C5 C6 C7 Vin 5 to 12V
10.0
47/16V
47/16V
47/16V
_
R5
200-1k
C8
0.1-0.33
R8
opt
L1
1.5-6.8uH
C10
220/4V
C11
220/4V
C12
220/4V
C13
220/4V
+
C14-17
1.0
3.3V
_
Revision: November 22, 2006
Figure 1
1
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SC1104A/B
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
VCC to GND
BST to PHASE
+20 V
+20 V
PHASE to GND
-0.5 to +20
V
COMP/SS to GND
+7 V
SENSE to GND
+7 V
Thermal Resistance Junction to Case
θJC 40 °C/W
Thermal Resistance Junction to Ambient θJA 160 °C/W
Operating Junction Temperature Range
TJ -40 to +125 °C
Operating Ambient Temperature Range
TA -40 to +85 °C
Storage Temperature Range
TSTG -65 to +150
°C
Lead Temperature (Soldering) 10 Sec.
TLead
300
°C
ESD Rating (Human Body Model)
VESD
2
kV
Electrical Characteristics
Unless specified: A: VCC = 12 ± 0.6V, VBST = 23 ± 1V, VOUT = 3.3V, TJ = TA = 25oC. B: VCC = 5 ± 0.25V, VBST = 12 ± 0.6V, VOUT = 2.0V, TJ = TA = 25oC
Parameter
Symbol
Conditions
Min Typ Max Units
Power Supply
Supply Voltage
Supply Current
Error Amplifier
E/A Transconductance(1)
Open Loop DC Gain(1)
Bandwidth - 3dB(1)
Input Bias Current
Output Sink Current
Source Current
Oscillator
Switching Frequency
VCC
VCC
ICC
gm
AO
FBW
IFB
ISIK
ISC
FOSC
FSW = 300kHz (nom.), SC1104A
FSW = 600kHz (nom.), SC1104B
VCOMP ≤ 0.4V
VSENSE ≥ 1.1V; VCOMP = 1.5V
VSENSE ≥ 0.9V; VCOMP = 1.5V
VCC = 12V ± 0.6V
VCC = 5V ± 0.25V
4.5
4.5
11
14 V
7
14 mA
12
42
400
1
0.65
0.7
0.95
1.1
mS
dB
kHz
3 µA
mA
255 300
345
kHz
510 600
690
© 2006 Semtech Corp.
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SC1104A/B
POWER MANAGEMENT
Electrical Characteristics
Unless specified: A: VCC = 12 ± 0.6V, VBST = 23 ± 1V, VOUT = 3.3V, TJ = TA = 25oC. B: VCC = 5 ± 0.25V, VBST = 12 ± 0.6V, VOUT = 2.0V, TJ = TA = 25oC
Parameter
Symbol
Conditions
Min Typ Max Units
Ramp Peak Voltage(1)
Ramp Valley Voltage(1)
Maximum Duty Cycle(2)
MOSFET Drivers
VP-K
VV
dcMAX
4.75V ≤ VCC ≤ 12.6V
4.75V ≤ VCC ≤ 12.6V
VCC = 12V (300kHz, SC1104A)
VCC = 5V (600kHz, SC1104B)
2.0
1.0
90 95
85 90
V
V
%
DH Sink/Source Current
SC1104A
DL Sink/Source Current
SC1104A
IDH
IDL
d.c. < 2%, tPW < 100µs
VGS = 4.5V (src)
VGS = 2.5V (snk)
0.6 0.8
0.6 0.7
A
DH Sink/Source Current
SC1104B
DL Sink/Source Current
SC1104B
IDH
IDL
d.c. < 2%, tPW < 100µs
VGS = 4.5V (src)
VGS = 2.5V (snk)
0.45
0.45
0.6
0.6
A
DH Rise/Fall Time
DL Rise/Fall Time
Dead Time
DH Minimum Off Time
Reference Section
tr, tf
tr, tf
tdt
tOFF
CL = 3000pF, See Fig. 2
CL = 4000pF, See Fig. 2
See Fig. 2
4.75V ≤ Vcc ≤ 12.6V
50 ns
50
80 ns
160
Reference Voltage
Temp Variance
Long Term Stability
Current Limit
VREF
∆VREF
4.75V ≤ Vcc ≤ 12.6V
0 < TJ < +70°C
-40 < TJ < +85°C
TJ = 125°C, 1000 hrs.
0.990
-1
-1.5
1.000
1.010
1
1.5
5
V
%
mV
Trip Voltage
Soft-Start/Enable
VTRIP
4.75V < Vcc < 12.6V
Vtrp = Vcc - VPHASE
180 200 220 mV
SS Source Current
SS Sink Current
Enable Input Threshold
ISRC
ISNK
VCOMP < 2.5V
VCOMP > 0.5V
0.5
0.5
1.00
1.8
1.8
1.35
µA
µA
V
Enable Input Current
VCOMP = 0.8V
2 mA
© 2006 Semtech Corp.
3
www.semtech.com
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Номер в каталоге | Описание | Производители |
SC1104A | (SC1104A/B) Synchronous Voltage Mode PWM Controller | Semtech Corporation |
SC1104B | (SC1104A/B) Synchronous Voltage Mode PWM Controller | Semtech Corporation |
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