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PDF SP6137HV Data sheet ( Hoja de datos )
| Número de pieza | SP6137HV | |
| Descripción | Dual Supply Synchronous Buck Controller | |
| Fabricantes | Sipex | |
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®
Preliminary
SP6137HV
Dual Supply Synchronous Buck Controller
FEATURES
■ 3V to 28V Step Down Achieved Using Dual Input
■ Small 10-Pin MSOP Package
■ 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
■ Programmable Soft Start
■ Fast Transient Response
■ High Efficiency: Greater than 94% Possible
■ A Synchronous Start-Up into a Pre-Charged Output
VCC 1
GL 2
GND 3
VFB 4
COMP 5
SP6137H
10 Pin MSOP
10 BST
9 GH
8 SWN
7 SS
6 UVIN
Now Available in Lead Free Packaging
APPLICATIONS
■ 12V DPA
■ Communications Systems
■ Graphics Cards
DESCRIPTION
The SP6137HV is a synchronous step-down switching regulator 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 SP6137HV is designed to drive a pair of external NFETs using a
fixed 900kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and
output short circuit protection. The SP6137HV is available in the cost and space saving 10-pin MSOP.
TYPICAL APPLICATION CIRCUIT
VCC = 5V @ 30mA
RLF
3.0,5%
R3
221k, 1%
UVIN
R4
100k, 1%
DBST
MBR0530
CVCC
10µF
6.3V
GND 3
0.8V
CVCC
Ceramic
8050
X5R
CF1
100pF
U1
SP6137H
1 VCC
BST 10
2 GL
GH 9
3 GND
SWN 8
4 VFB
SS 7
5 COMP UVIN 6
CZ2 RZ2
820pF 40.2k, 1%
CP1
56pF
fs=900Khz
8765
QT FDS6676S
4 14.5A, 6mΩ
123
CBST
1µF
R5
Bead
8765
QB
4
SS 1 2 3
FDS6676S
CSS 14.5A, 6.0mΩ
47nF
VOUT=(R1/R2 +1)VFB
C1
22µF
16V
C2
22µF
16V
C1, C2
Ceramic
1210
X5R
VIN
3.5V - 28V
GND
C3
47µF
6.3V
C4
47µF
6.3V
RZ3
4.64k, 1%
CZ3
220pF
VOUT≤VIN
0.8V - 3.3V
0 - 10 A
R1
68.1k, 1%
GND2
C3, C4
Ceramic
1210
X5R
R2
21.5k, 1%
Date: 5/25/04
SP6137HV Dual Supply, Synchronous Buck 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 SP6137HV is forced into an idle state
where the output drivers are held off for a finite
period before a re-start is attempted.
Under Voltage Lock Out (UVLO)
The SP6137HV contains two separate UVLO
comparators to monitor the bias (VCC) and con-
version (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 SP6137HV is per-
mitted to start up pending the removal of all
other faults. Both the VCC and VIN UVLO com-
parators have been designed with hysteresis to
prevent noise from resetting a fault.
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 SP6137HV provides the user with the op-
tion 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)
THEORY OF OPERATION: Continued
Hiccup
Upon the detection of a power, thermal, or short-
circuit fault, the SP6137HV is forced into an
idle state for 100mS (typical). The SS and COMP
pins are immediately pulled low, and the gate
drivers are held off for the duration of the
timeout period. Power and thermal faults have
to be removed before a restart may be attempted,
whereas, a short-circuit fault is internally cleared
shortly after the fault latch is set. Therefore, a
restart attempt is guaranteed every 100mS (typi-
cal) as long as the short-circuit condition per-
sists.
Thermal and Short-Circuit
Protection
Because the SP6137HV is designed to drive
large NFETs running at high current, there is a
chance that either the controller or power con-
verter will become too hot. Therefore, an inter-
nal thermal shutdown (145°C) has been in-
cluded to prevent the IC from malfunctioning at
extreme temperatures.
A short-circuit detection comparator has also
been included in the SP6137HV 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
SP6137HV is capable of detecting short-circuit
faults throughout the duration of soft start as
well as in regular operation.
Error Amplifier and Voltage Loop
As stated before, the heart of the SP6137HV
voltage error loop is a high performance, wide
bandwidth transconductance amplifier. Because
of the amplifier’s current limited (+/-150µA)
transconductance, there are many ways to com-
pensate the voltage loop or to control the COMP
pin externally. If a simple, single pole, single
Date: 5/25/04
SP6137HV Dual Supply, Synchronous Buck 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 SP6137CU 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
1.2
1.2
1.5
1.9
Capacitance
(uF)
22
47
INDUCTORS - SURFACE MOUNT
Inductor Specification
Manufacturer/Part No.
Series R
mΩ
ISAT Size
(a) LxW(mm) Ht.(mm)
Inductor Type
Manufaturer
Website
Easy Magnet SC5018-2R7M
TDK RLF 12560T-2R7N110
Coilcraft DO5010P-332HC
4.30
4.50
8.60
12.0 12.6x12.6
12.2 12.5x12.8
17.0 14.7x15.2
4.5 Shielded Ferrite Core inter-technical.com
6.0 Shielded Ferrite Core tdk.com
8.0 Unshielded Ferrite Core coilcraft.com
Easy Magnet SC5018-1R2M
Inter-Technical SC4015-1R2M
Coilcraft DO5010P-152HC
TDK RLF 12560T-1R9N120
1.96
4.37
4.00
3.60
20.0 12.6x12.6
17.0 10.0x10.0
25.0 14.7x15.2
13.2 12.5x12.8
4.5 Shielded Ferrite Core inter-technical.com
3.8 Shielded Ferrite Core inter-technical.com
8.0 Unshielded Ferrite Core coilcraft.com
6.0 Shielded Ferrite Core tdk.com
CAPACITORS -SURFACE MOUNT
Manufacturer/Part No.
ESR Ripple Current
Size Voltage Capacitor
Ω (max) (A)@45°C LxW(mm) Ht.(mm) (V)
Type
Manufaturer
Website
TDK C3225X5R1C226M 0.002
4.00
3.2x2.5 2.0
16.0 X5R Ceramic tdk.com
TDK C3225X5ROJ476M 0.002
4.00
3.2x2.5 2.5
6.3 X5R Ceramic tdk.com
MOSFET - Surface Mount
MOSFET Manufacturer/Part No.
RDS (on)
Ω (max)
ID Current Qg
Qg
(A) nC(Typ) nC(Max)
N-Channel Fairchild Semi FDS6676S 0.006
14.50
43
60.0
N-Channel Fairchild Semi FD7088N3 0.005
21.10
37
48.0
N-Channel Vishay Si4336DY
0.004
25.0 32 50.0
Note: Components highlighted in Bold are those used on the SP6134 Evaluation Board.
Voltage Foot Print
(V)
30.0 SO-8
30.0 SO-8
30.0 SO-8
Table 1. Input and Output Stage Components Selection Charts.
Manufaturer
Website
fairchildsemi.com
fairchildsemi.com
vishay.com
Date: 5/25/04
SP6137HV Dual Supply, Synchronous Buck Controller
11
© Copyright 2004 Sipex Corporation
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SP6137HV.PDF ] | |
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