CS7054 Datasheet, PDF (1/6 Pages) Cherry Semiconductor Corporation – Low Side PWM FET Controller

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
V_BAT 42.5mH
R_S
51
1000mF
1000mF
10mF
C_FLT
C_OSC
.25mF
390pF
R_OSC
105K
OUTPUT V_CC
Gnd _PGnd
FLT
INH
C_OSC
I_ADJ
R_OSC ^ISENSE+
CTL ^ISENSE-
NC
V_REG
Input
10K
10K
10K
P1
100K
10K
N1
10K
10mF
10K
R_GATE
6
.01mF
1M
MOT+
MOT-
R_CS1
C_CS 51
.022mF
R_CS2
51
R_SENSE
4mW
Package Options
14 Lead PDIP
OUTPUT ₁
Gnd 2
FLT 3
C_OSC 4
R_OSC 5
CTL 6
NC 7
14 V_CC
13 PGnd
12 INH
11 I_ADJ
10 ^ISENSE+
9 ^ISENSE-
8 V_REG
Consult factory for 16 lead SO
wide package.
Rev. 4/21/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
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