CS3524A Datasheet, PDF (1/8 Pages) Cherry Semiconductor Corporation – Voltage Mode PWM Control Circuit with 200mA Output Drivers

CS3524A
Voltage Mode
PWM Control Circuit with
200 mA Output Drivers
The CS3524A PWM control circuit retains the same versatile
architecture of the industry standard CS3524 (SG3524) while adding
substantial improvements.
The CS3524 is pin−compatible with “non−A” versions, and in most
applications can be directly interchanged. The CS3524A, however,
eliminates many of the design restrictions which had previously
required additional external circuitry.
The CS3524A includes a precision 5.0 V reference trimmed to ±1%
accuracy (eliminating the need for potentiometer adjustments), an
error amplifier with an output voltage swing extending to 5.0 V, and a
current sense amplifier useful in either the ground or power supply
output lines. The uncommitted 60 V, 200 mA NPN output pair greatly
enhances the output drive capability.
The CS3524A features an undervoltage lockout circuit which
disables all internal circuitry (except the reference) until the input
voltage has risen to 8.0 V. This holds standby current low until
turn−on, and greatly simplifies the design of low power, off−line
supplies. The turn−on circuit has approximately 600 mV of hysteresis
for jitter free activation.
Other improvements include a PWM latch that insures freedom
from multiple pulsing within a period, even in noisy environments;
logic to eliminate double pulsing on a single output, a 200 ns external
shutdown capability, and automatic thermal protection from excessive
chip temperature. The oscillator circuit is usable to 500 kHz and is
easier to synchronize with an external clock pulse.
Features
• Precision Reference Internally Trimmed to ±1%
• Current Limit
• Undervoltage Lockout
• Start−Up Supply Current < 4.0 mA
• Output to 200 mA
• 60 V Output Capability
• Wide Common−Mode Input Range for Error and Current Limit
Amplifiers
• PWM Latch Insures Single Pulse per Period
• Double Pulse Suppression
• 200 ns Shutdown
• Guaranteed Frequency
• Thermal Shutdown
http://onsemi.com
16
1
DIP−16
N SUFFIX
CASE 648
MARKING
DIAGRAMS
16
CS3524A
AWLYYWW
1
16
1
SO−16L
DW SUFFIX
CASE 751G
16
CS3524A
AWLYYWW
1
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
1
EA−
EA+
SYNC
I_SENSE+
I_SENSE−
R_T
C_T
GND
V_REF
V_IN
E_B
V_OUTB
V_OUTA
E_A
SHUTDOWN
COMP
ORDERING INFORMATION
Device
Package Shipping
CS3524AGN16
DIP−16 25 Units/Rail
CS3524AGDW16
CS3524AGDWR16
SO−16L 46 Units/Rail
SO−16L 1000 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 4
Publication Order Number:
CS3524A/D