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PDF CS7054YN14 Data sheet ( Hoja de datos )
| Número de pieza | CS7054YN14 | |
| Descripción | Low Side PWM FET Controller | |
| Fabricantes | Cherry Semiconductor Corporation | |
| Logotipo |  |
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CS7054
Low Side PWM FET Controller
Description
The CS7054 is a monolithic integrat-
ed circuit designed primarily to
control the rotor speed of perma-
nent magnet, direct current (DC)
brush motors. It drives the gate of
an N channel power MOSFET or
IGBT with a user-adjustable, fixed
frequency, variable duty cycle,
pulse width modulated (PWM) sig-
nal. The CS7054 can also be used to
control other loads such as incan-
descent bulbs and solenoids.
Inductive current from the motor or
solenoid is recirculated through an
external diode.
The CS7054 accepts a DC level
input signal of 0 to 5V to control the
pulse width of the output signal.
This signal can be generated by a
potentiometer referenced to the on-
chip 5V linear regulator, or a fil-
tered 0% to 100% PWM signal also
referenced to the 5V regulator.
The IC is placed in a sleep state by
pulling the CTL lead below 0.5V. In
this mode everything on the chip is
shut down except for the on-chip
regulator and the overall current
draw is less than 275 µA. There are
a number of on-chip diagnostics
that look for potential failure modes
and can disable the external power
MOSFET.
Features
s 200 mA Peak PWM Gate
Drive Output
s Patented Voltage
Compensation Circuit
s 100% Duty Cycle
Capability
s 5V, ± 3% Linear Reg.
s Low Current Sleep Mode
s Overvoltage Protection
s Over Current Protection
of External MOSFET /
IGBT
s Output Inhibit
Application Diagram
VBAT 42.5mH
1000mF
1000mF
RS
51
10mF
CFLT
COSC
.25mF
390pF
ROSC
105K
OUTPUT VCC
Gnd PGnd
FLT INH
COSC
IADJ
ROSC ISENSE+
CTL ISENSE-
NC VREG
Input
10K
10K
P1
100K
10K
10K
N1 10K
10mF
10K
RGATE
6
.01mF
1M
MOT+
MOT-
RCS1
CCS 51
.022mF
RCS2
51
RSENSE
4mW
Package Options
14 Lead PDIP
OUTPUT 1
Gnd 2
FLT 3
COSC 4
ROSC 5
CTL 6
NC 7
14 VCC
13 PGnd
12 INH
11 IADJ
10 ISENSE+
9 ISENSE-
8 VREG
Consult factory for 16 lead SO
wide package.
Rev. 4/21/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
1
A Company
¨
1 page  
where:
On Time = CFLT ´
Application Information: continued
2.4V - 0.6V
IAVG
Overvoltage Shutdown
The IC will disable the output during an overvoltage
event. This is a real time fault event and does not set the
internal latch and therefore is independent of the oscillator
timing (i.e. asynchronous). There is no undervoltage lock-
out. The device will shutdown gracefully once it runs out
of headroom.
IAVG = ( 295.5µA ´ DC ) - [4.5µA ´ (1 - DC )]
IAVG = ( 300µA ´ DC ) - 4.5µA
DC = PWM Duty Cycle
Sleep State
This device will enter into a low current mode (<275µA)
when CTL lead is brought to less than 0.5V. All functions
are disabled in this mode, except for the regulator.
Inhibit
When the inhibit voltage is greater than 2.5V the internal
latch is set and the external MOSFET will be turned off for
the remainder of the oscillator cycle. The latch is then reset
at the start of the next cycle.
Reverse Battery
The CS7054 will not survive a reverse battery condition.
Therefore, a series diode is required between the battery
and the VCC lead.
Load Dump
VCC is internally clamped to 30V. It is recommended that a
51½ resistor, (RS) is placed in series with VCC to limit the
current flow into the IC in the event of a 40V peak tran-
sient condition.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet CS7054YN14.PDF ] | |
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