SG3524BDW-TR Datasheet, PDF (1/5 Pages) Microsemi Corporation – REGULATING PULSE WIDTH MODULATOR

SG1524B/SG2524B/SG3524B
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
The SG1524B is a pulse width modulator for switching power supplies
which features improved performance over industry standards like the
SG1524. A direct pin-for-pin replacement for the earlier device, it
combines advanced processing techniques and circuit design to provide
improved reference accuracy, and extended common mode range at the
error amplifier and current limit inputs. A DC-coupled flip-flop eliminates
triggering and glitch problems, and a PWM data latch prevents edge
oscillations. The circuit incorporates true digital shutdown for high speed
response, while an undervoltage lockout circuit prevents spurious outputs
when the supply voltage is too low for stable operation. Full double-pulse
suppression logic insures alternating output pulses when the Shutdown
pin is used for pulse-by-pulse current limiting. The SG1524B is specified
for operation over the full military ambient temperature range of -55°C to
125°C. The SG2524B is characterized for the industrial range of -25°C to
85°C, and the SG3524B is designed for the commercial range of 0°C
to 70°C.
FEATURES
• 7V to 40V operation
• 5V reference trimmed to ±1%
• 100Hz to 400KHz oscillator range
• Excellent external sync capability
• Dual 100mA output transistors
• Wide current limit common mode range
• DC-coupled toggle flip-flop
• PWM data latch
• Undervoltage lockout
• Full double-pulse suppression logic
• 60V output collectors
HIGH RELIABILITY FEATURES
- SG1524B
♦ Available to MIL-STD-883 and DESC SMD
♦ Scheduled for MIL-M-38510 QPL listing
♦ Radiation data available
♦ LMI level "S" processing available
DESCRIPTION
V_REF
+V_IN
GROUND
R_T
C_T
Reference
Regulator
Undervoltage
Lockout
Oscillator
To Internal ^OSC
Circuitry
COLLECTOR A
INVERTING
NON-INVERTING
+C.L. SENSE
-C.L. SENSE
Error
+V
IN
C.L.
P.W.M.
S
Q
D
Q
PWM
LATCH
S
RQ
Q
T
Q
MEMORY TOGGLE
F/F
F/F
EMITTER A
COLLECTOR B
EMITTER B
COMPENSATION SHUTDOWN
Rev 1.3a 3.21.2005
Copyright  2000
1
Microsemi Inc.
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