CS7054
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
Package Options
MOT+
14 Lead PDIP
V
BAT
42.5mH
R
S
51
1000mF
1000mF
OUTPUT
V
CC
Gnd
PGnd
FLT
INH
1M
10mF
R
GATE
6
.01mF
MOT-
OUTPUT
1
Gnd
2
FLT
3
C
OSC
4
R
CS1
C
CS
51
.022mF
R
CS2
R
SENSE
4mW
14
13
12
V
CC
PGnd
INH
C
FLT
C
OSC
R
OSC
105K
.25mF
390pF
C
OSC
R
OSC
CTL
NC
I
ADJ
I
SENSE+
I
SENSE-
11
I
ADJ
10
I
SENSE+
9
8
R
OSC
5
CTL
6
NC
7
I
SENSE-
V
REG
V
REG
51
Input
10K
10K
P1
100K
N1
10K
10mF
10K
10K
10K
Consult factory for 16 lead SO
wide package.
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 4/21/99
1
A
¨
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
