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PDF SP6132 Data sheet ( Hoja de datos )
| Número de pieza | SP6132 | |
| Descripción | Wide Input / 300KHz Synchronous PWM Controller | |
| Fabricantes | Sipex | |
| Logotipo |  |
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® SP6132
Wide Input, 300KHz Synchronous PWM Controller
FEATURES
■ 3V to 12V Step Down Achieved Using Dual Input
■ 2A to 15A Ouput Capability
■ Highly Integrated Design, Minimal Components
■ UVLO Detects Both VCC and VIN
■ Short Circuit Protection with Auto-Restart
■ On-Board 1.5Ω sink (2Ω source) NFET Drivers
■ Wide BW Amp Allows Type II or III Compensation
■ Programmable Soft Start
■ Fast Transient Response
■ High Efficiency: Greater than 95% Possible
■ A Synchronous Start-Up into a Pre-Charged Output
■ Small 10-Pin MSOP Package
VCC 1
GL 2
GND 3
VFB 4
COMP 5
SP6132
10 Pin MSOP
10 BST
9 GH
8 SWN
7 SS
6 UVIN
Now Available in Lead Free Packaging
DESCRIPTION
The SP6132 is wide input, synchronous step-down switching controller optimized for high efficiency. The part is
designed to be especially attractive for dual supply, 12V step down with 5V used to power the controller. This lower VCC
voltage minimizes power dissipation in the part. The SP6132 is designed to drive a pair of external NFETs using a fixed
300kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output
short circuit protection. The SP6132 is available in the cost and space saving 10-pin MSOP.
TYPICAL APPLICATION CIRCUIT
VCC
8765
QT
FDS7088N3
4 21A, 5mΩ
123
C1
22µF
16V
C2
22µF
16V
C1, C2
Ceramic
1210
X5R
VIN
12V
GND
R3
221k, 1%
UVIN
R4
100k, 1%
DBST
MBR0530
CVCC GND 3
10µF
6.3V
CVCC
Ceramic
0805
X5R
C7
0.1µF
CF1
100pF
U1
1 VCC
BST 10
2 GL SP6132 GH 9
3 GND
SWN 8
4 VFB
SS 7
5 COMP UVIN 6
CBST
1µF
10V
R5
5.11, 1%
SS
L1 SC5018-2R7M
8 7 6 5 2.7µH @ 12A
DCR=4.30mΩ
QB
4 FDS7088N3
21A, 5mΩ
123
C3
47µF
6.3V
C4
47µF
6.3V
CZ2 RZ2
CSS
47nF
GND2
1500pF 27.4k, 1%
CP1
22pF
C3, C4
Ceramic
1210
X5R
fs=300Khz
ALL RESISTORS AND CAPS ARE 0603 UNLESS OTHERWISE SPECIFIED
Q1, Q2 BOTTOM SIDE DRAIN CONTACT
RZ3
4.64k, 1%
CZ3
220pF
VOUT
3.3V
0 - 10 A
R1
68.1k, 1%
R2
21.5k, 1%
Date: 8/4/04
SP6132 Wide Input, 300KHz Synchronous PWM Controller
1
© Copyright 2004 Sipex Corporation
1 page  
tection features include thermal shutdown and
short-circuit detection. In the event that either a
thermal, short-circuit, or UVLO fault is de-
tected, the SP6132 is forced into an idle state
where the output drivers are held off for a finite
period before a re-start is attempted.
Soft Start
“Soft Start” is achieved when a power converter
ramps up the output voltage while controlling
the magnitude of the input supply source cur-
rent. In a modern step down converter, ramping
up the positive terminal of the error amplifier
controls soft start. As a result, excess source
current can be defined as the current required to
charge the output capacitor.
IVIN = COUT * DVOUT / DTSoft-start
The SP6132 provides the user with the option to
program the soft start rate by tying a capacitor
from the SS pin to GND. The selection of this
capacitor is based on the 10uA pull up current
present at the SS pin and the 0.8V reference
voltage. Therefore, the excess source can be
redefined as:
IVIN = COUT * DVOUT *10µA / (CSS * 0.8V)
Under Voltage Lock Out (UVLO)
The SP6132 contains two separate UVLO com-
parators to monitor the bias (VCC) and conver-
sion (VIN) voltages independently. The VCC
UVLO threshold is internally set to 4.25V,
whereas the VIN UVLO threshold is program-
mable through the UVIN pin. When the UVIN
pin is greater than 2.5V, the SP6132 is permitted
to start up pending the removal of all other
faults. Both the VCC and VIN UVLO compara-
tors have been designed with hysteresis to pre-
vent noise from resetting a fault.
THEORY OF OPERATION: Continued
Thermal and Short-Circuit
Protection
Because the SP6132 is designed to drive large
NFETs running at high current, there is a chance
that either the controller or power converter will
become too hot. Therefore, an internal thermal
shutdown (145°C) has been included to prevent
the IC from malfunctioning at extreme tempera-
tures.
A short-circuit detection comparator has also
been included in the SP6132 to protect against
the accidental short or sever build up of current
at the output of the power converter. This com-
parator constantly monitors the positive and
negative terminals of the error amplifier, and if
the VFB pin ever falls more than 250mV (typi-
cal) below the positive reference, a short-circuit
fault is set. Because the SS pin overrides the
internal 0.8V reference during soft start, the
SP6132 is capable of detecting short-circuit
faults throughout the duration of soft start as
well as in regular operation.
Handling of Faults:
Upon the detection of power (UVLO), thermal,
or short-circuit faults, the SP6132 is forced into
an idle state where the SS and COMP pins are
pulled low and the gate drivers are held off. In
the event of UVLO fault, the SP6132 remains in
this idle state until the UVLO fault is removed.
Upon the detection of a thermal or shor-circuit
fault, an internal 200ms (typical) timer is acti-
vated. In the event of a short-circuit fault, a re-
start is attempted immediately after the 200ms
timeout expires. Wereas, when a thermal fault
is detected the 200ms delay continuously re-
cycles and a re-start cannot be attempted until
the thermal fault is removed and the timer ex-
pires.
Error Amplifier and Voltage Loop
As stated before, the heart of the SP6132 voltage
error loop is a high performance, wide band-
width transconductance amplifier. Because of
the amplifier’s current limited (+/-150µA)
Date: 8/4/04
SP6132 Wide Input, 300KHz Synchronous PWM Controller
5
© Copyright 2004 Sipex Corporation
5 Page 
APPLICATIONS INFORMATION: Continued
The goal of loop compensation is to manipulate
loop frequency response such that its gain crosses
over 0db at a slope of -20db/dec. The first step
of compensation design is to pick the loop
crossover frequency. High crossover frequency
is desirable for fast transient response, but often
jeopardizes the system stability. Crossover fre-
quency should be higher than the ESR zero but
less than 1/5 of the switching frequency. The
ESR zero is contributed by the ESR associated
with the output capacitors and can be deter-
mined by:
When the output capacitors are of a Ceramic
Type, the SP6132CU Evaluation Board requires
a Type III compensation circuit to give a phase
boost of 180° in order to counteract the effects of
an under damped resonance of the output filter
at the double pole frequency.
Gain
(dB)
Condition:
C22 >> CP1, R1 >> RZ3
Error Amplify Gain
Bandwidth Product
ƒZ(ESR) =
1
2π COUT RESR
The next step is to calculated the complex con-
jugate poles contributed by the LC output filter,
ƒP(LC) =
1
2π L COUT
20 Log (RZ2/R1)
Frequency
(Hz)
Bode Plot of Type III Error Amplify Compensation.
Inductance
(uH)
2.7
2.7
3.3
Manufacturer/Part No.
Easy Magnet SC5018-2R7M
TDK RLF12560T-2R7N110
Coilcraft DO5010P-332HC
1.2 Easy Magnet SC5018-1R2M
1.2 Inter-Technical SC4015-1R2M
1.5 Coilcraft DO5010P-152HC
1.9 TDK RLF12560T-1R9N120
Capacitance(u
F)
22
47
Manufacturer/Part No.
TDK C3225X5R1C226M
TDK C3225X5R0J476M
MOSFET
N-Channel
N-Channel
Manufacturer/Part No.
Fairchild Semi FDS7088N3
Vishay Si4336DY
Series R
mOhms
4.30
4.50
8.60
INDUCTORS - SURFACE MOUNT
Inductor Specification
Isat Size Inductor Type
(A) LxW(mm) Ht.(mm)
12.0
12.6x12.6 4.5 Shielded Ferrite Core
12.2
12.5x12.8 6.0 Shielded Ferrite Core
17.0
14.7x15.2
8.0 Unshielded Ferrite Core
1.96
4.37
20.0
17.0
12.6x12.6
10.0x10.0
4.5 Shielded Ferrite Core
3.8 Shielded Ferrite Core
4.00
3.60
25.0
13.2
14.7x15.2
12.5x12.8
8.0 Unshielded Ferrite Core
6.0 Shielded Ferrite Core
CAPACITORS - SURFACE MOUNT
ESR
Capacitor Specification
Ripple Current
Size
Voltage
Capacitor
ohms (max)
0.002
(A) @ 45C
4.00
LxW(mm) Ht.(mm) (V)
3.2x2.5
2.0 16.0
Type
X5R Ceramic
0.002
4.00 3.2x2.5 2.5 6.3 X5R Ceramic
MOSFETS - SURFACE MOUNT
RDS(on)
ohms (max)
0.005
MOSFET Specification
ID Current
Qg Voltage
(A) nC (Typ) nC (Max) (V)
21.0 37.0 48.0 30.0
Foot Print
SO-8
0.004
25.0
32.0 50.0 30.0
SO-8
Manufacturer
Website
www.easymagnet.com
www.tdk.com
www.coilcraft.com
www.easymagnet.com
www.inter-technical.com
www.coilcraft.com
www.tdk.com
Manufacturer
Website
www.tdk.com
www.tdk.com
Manufacturer
Website
www.fairchildsemi.com
www.Vishay.com
Note: Components highlighted in bold are those used on the SP6132 Evaluation Board.
Table 1. Input and Output Stage Components Selection Charts.
Date: 8/4/04
SP6132 Wide Input, 300KHz Synchronous PWM Controller
11
© Copyright 2004 Sipex Corporation
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SP6132.PDF ] | |
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