CS4124 Datasheet, PDF (1/6 Pages) Cherry Semiconductor Corporation – High Side PWM FET Controller

CS4124
Preliminary
High Side PWM FET Controller
Description
The CS4124 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 CS4124 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 CS4124 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
shutdown except for the on-chip
regulator and the overall current
draw is less than 275µA. There are a
number of on-chip diagnostics that
look for potential failure modes and
can disable the external power
MOSFET.
Features
s 150mA Peak PWM Gate
Drive Output
s Patented Voltage
Compensation Circuit
s 100% Duty Cycle
Capability
s 5V, ± 3% Linear Regulator
s Low Current Sleep Mode
s Overvoltage Protection
s Boost Mode Power
Supply
s Output Inhibit
Applications Diagram
V_BAT 42.5µH
1000µF
R_S
1000µF 10
470µH
100µF
Input
1.5µF
10K
10nF
.01µF
C_FLT .25µF
R_{OSC 93.1K}
C_OSC 470pF
OUTPUT Gnd
BOOST _INH
FLT
I_ADJ
R_OSC
I_SENSE+
I_SENSE-
C_{OSC PMP}
CTL
PGnd
V_CC
SNI
V_REG
R_SNI
4
10K
10K
1µF
P1
10K
100K
10K
N1
10K
10µF
10K
R_CS1
C_CS 51
.022µF
R_CS2
51
R_SENSE
4m
R_GATE 6
1M
MOT+
MOT-
Package Option
16 Lead PDIP
OUTPUT ¹
BOOST
FLT
R_OSC
C_OSC
CTL
PGnd
V_CC
Gnd
INH
I_ADJ
I_SENSE+
I_SENSE-
PMP
SNI
V_REG
Consult Factory for 16 Lead SOIC
Wide package.
Rev. 4/26/99
1195
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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