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PDF SP6132H Data sheet ( Hoja de datos )
| Número de pieza | SP6132H | |
| Descripción | High Voltage / 300KHz Synchronous PWM Controller | |
| Fabricantes | Sipex | |
| Logotipo |  |
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® SP6132H
High Voltage, 300KHz Synchronous PWM Controller
FEATURES
■ 3V to 28V 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
SP6132H
10 Pin MSOP
10 BST
9 GH
8 SWN
7 SS
6 UVIN
Now Available in Lead Free Packaging
DESCRIPTION
The SP6132H 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 SP6132H 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 SP6132H is available in the cost and space saving 10-pin MSOP.
TYPICAL APPLICATION CIRCUIT
4
VCC
221k, 1%
MBR0530
10µF
SP6132H
VCC
GL
BST
GH
GND
SWN
VFB SS
COMP UVIN
1µF
5.11, 1%
47nF
100k, 1%
0.1µF
100pF
1500pF 27.4k, 1%
22pF
4
FDS7088N3
22µF
22µF
VIN
3.0 - 28V
GND
2.7µH @ 12A
FDS7088N3
47µF
2.5V
10 A
VOUT
4.64k, 1%
47µF
220pF
68.1k, 1%
31.6k, 1%
Date: 8/4/04
SP6132H High Voltage, 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 SP6132H 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 SP6132H 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 SP6132H 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 SP6132H is permit-
ted 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 SP6132H 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 SP6132H 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
SP6132H 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 SP6132H 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 SP6132H re-
mains in this idle state until after the UVLO fault
is removed. Upon the detection of thermal or
shor-circuit faults, an internal 200ms (typical)
timer is activated. In the event of a short-circuit
fault, a re-start is attempted immediately after
the 200ms timeout expires. Whereas, when a
thermal fault is detected the 200ms delay con-
tinuously recycles and a re-start cannot be at-
tempted until the thermal fault is removed and
the timer expires.
Error Amplifier and Voltage Loop
As stated before, the heart of the SP6132H
voltage error loop is a high performance, wide
bandwidth transconductance amplifier. Because
of the amplifier’s current limited (+/-150µA)
Date: 8/4/04
SP6132H High Voltage, 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 SP6132HHVCU 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 Voltage Foot Print
(A) nC(Typ) nC(Max) (V)
N-Channel Fairchild Semi FDS6676S 0.006
14.50
43
60.0 30.0 SO-8
N-Channel Fairchild Semi FD7088N3 0.005
21.10
37
48.0 30.0 SO-8
N-Channel Vishay Si4336DY
0.004
25.0 32 50.0 30.0 SO-8
Note: Components highlighted in Bold are those used on the SP6132H Evaluation Board.
Table 1. Input and Output Stage Components Selection Charts.
Manufaturer
Website
fairchildsemi.com
fairchildsemi.com
vishay.com
Date: 8/4/04
SP6132H High Voltage, Synchronous PWM Controller
11
© Copyright 2004 Sipex Corporation
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SP6132H.PDF ] | |
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