|
|
PDF SP7652 Data sheet ( Hoja de datos )
| Número de pieza | SP7652 | |
| Descripción | Wide Input Voltage Range 6A / 600kHz / Buck Regulator | |
| Fabricantes | Sipex | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SP7652 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
®
Preliminary
SP7652
Wide Input Voltage Range 6A, 600kHz, Buck Regulator
FEATURES
■ 2.5V to 28V Step Down Achieved Using Dual Input
■ Output Voltage down to 0.8V
■ 6A Output Capability (Up to 8A with Air Flow)
■ Built in Low RDSON Power FETs (15 mΩ typ)
■ Highly Integrated Design, Minimal Components
■ 600 kHz Fixed Frequency Operation
■ UVLO Detects Both VCC and VIN
■ Over Temperature Protection
■ Short Circuit Protection with Auto-Restart
■ Wide BW Amp Allows Type II or III Compensation
■ Programmable Soft Start
■ Fast Transient Response
■ High Efficiency: Greater than 92% Possible
■ Asynchronous Start-Up into a Pre-Charged Output
■ Small 7mm x 4mm DFN Package
PGND 1
PGND 2
PGND 3
GND 4
VFB 5
COMP 6
UVIN 7
GND 8
SS 9
VIN 10
VIN 11
VIN 12
VIN 13
SP7652
DFN PACKAGE
7mm x 4mm
TOP VIEW
Heatsink Pad 1
Connect to Lx
Heatsink pad 2
Connect to GND
Heatsink pad 3
Connect to VIN
26 LX
25 LX
24 LX
23 LX
2 2 VCC
21 GND
20 GND
19 GND
18 BST
17 NC
16 LX
15 LX
14 LX
Now Available in Lead Free Packaging
DESCRIPTION
The SP7652 is a synchronous step-down switching regulator 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 SP7652 is designed to provide a fully integrated buck regulator solution
using a fixed 600kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown
and output short circuit protection. The SP7652 is available in the space saving DFN package.
TYPICAL APPLICATION CIRCUIT
100pF 5.1K
21.5k,1%
RSET
(note 2)
1nF 12K
22pF
CF1
100pF
ENABLE
VIN
2.5V - 20V
CSS
22nF
C1
22uF
GND
1
PGND
2
PGND
3
PGND
4
GND
5
VFB
6
COMP
7
UVIN
8
GND
9
SS
10
VIN
11
VIN
12
VIN
13
VIN
U1
SP7652
LX
LX
LX
LX
VCC
GND
GND
GND
BST
NC
LX
LX
LX
26
25
24
23
22
21
20
19
18
17
16
15
14
68.1k,1%
1.5uH, Irate=8A
CVCC
1uF
5V VCC
VOUT
3.3V
0-8A
47uF
Ceramic
X5R 6.3V
5.1 SD101AWS
1uF
Notes:
1. U1 Bottom-Side Layout should has
three contacts isolated from one
another VIN and SWNODE and GND
2. RSET = 54.48 / (Vout - 0.8V) (kOhm)
Date: 08/12/04
SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator
1
© Copyright 2004 Sipex Corporation
1 page  
clude thermal shutdown and short-circuit detec-
tion. In the event that either a thermal, short-
circuit, or UVLO fault is detected, the SP7652 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 SP7652 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 SP7652 contains two separate UVLO com-
parators to monitor the internal bias (VCC) and
conversion (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 SP7652 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
Thermal and Short-Circuit
Protection
Because the SP7652 is designed to drive large
output current, there is a chance that the power
converter will become too hot. Therefore, an
internal thermal shutdown (145°C) has been
included to prevent the IC from malfunctioning
at extreme temperatures.
A short-circuit detection comparator has also
been included in the SP7652 to protect against
an accidental short at the output of the power
converter. This comparator constantly monitors
the positive and negative terminals of the error
amplifier, and if the VFB pin falls more than
250mV (typical) below the positive reference, a
short-circuit fault is set. Because the SS pin
overrides the internal 0.8V reference during soft
start, the SP7652 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 SP7652 is forced into
an idle state where the SS and COMP pins are
pulled low and the NFETS are held off. In the
event of UVLO fault, the SP7652 remains in this
idle state until the UVLO fault is removed.
Upon the detection of a thermal or short-circuit
fault, an internal 200ms timer is activated. In the
event of a short-circuit fault, a re-start is at-
tempted immediately after the 200ms timeout
expires. Whereas, when a thermal fault is de-
tected the 200ms delay continuously recycles
and a re-start cannot be attempted until the
thermal fault is removed and the timer expires.
Error Amplifier and Voltage Loop
Since the heart of the SP7652 voltage error loop
is a high performance, wide bandwidth
transconductance amplifier great care should be
taken to select the optimal compensation net-
work. Because of the amplifier’s current lim-
ited (+/-150µA) transconductance, there are
many ways to compensate the voltage loop or to
Date: 08/12/04
SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator
5
© Copyright 2004 Sipex Corporation
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
96.0
94.0
92.0
90.0
88.0
86.0
84.0
82.0
80.0
1
SP7652 Effi. vs Iout Plots @
Vin=8V, 12V, 15V, and Vout=5.0V
Vin=12V
Vin=8V
Vin=15V
234
Load Current (A)
5
6
4.96
SP7652 Vout vs Iout Plots @
Vin=8V, 12V, and 15V
4.955
4.95
4.945
Vin=12V
Vin=8V
4.94
Vin=15V
01 234 56
Load Current (A)
93.5
93.0
92.5
92.0
91.5
91.0
90.5
90.0
1
SP7652 Effi. vs Iout Plots @
Vin=5V, and Vout=3.3V
2345
Load Current (A)
6
3.31
SP7652 Vout vs Iout Plots @
Vin=5V, and Vout=3.3V
3.305
3.3
3.295
3.29
3.285
3.28
0123456
Load Current (A)
SP7652 Effi. vs Iout Plots @ Vin=3.3V, and Vout=0.8V
80.0
79.0
78.0
77.0
76.0
75.0
74.0
73.0
72.0
71.0
70.0
12345
Load Current (A)
6
SP7652 Vout vs Iout Plots @ Vin=3.3V, and Vout=0.8V
0.794
0.792
0.79
0.788
0.786
01 2 34 5
Load Current (A)
6
Date: 08/12/04
SP7652 Wide Input Voltage Range 6A, 600kHz, Buck Regulator
11
© Copyright 2004 Sipex Corporation
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SP7652.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SP7650 | Wide Input Voltage Range 3A / 300kHz / Buck Regulator | Sipex |
| SP7651 | Wide Input Voltage Range 3A / 900kHz / Buck Regulator | Sipex |
| SP7652 | 6A 28V 600KHz Synchronous Step Down Regulator |  Exar |
| SP7652 | Wide Input Voltage Range 6A / 600kHz / Buck Regulator | Sipex |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |