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The LM3524D family is an improved version of the industry tandard LM3524. It has improved specifications and additional eatures yet is pin for pin compatible with existing 3524 amilies. New features reduce the need for additional external ircuitry often required in the original version.
The LM3524D has a ±1% precision 5V reference. The current arrying capability of the output drive transistors has een raised to 200 mA while reducing VCEsat and increasing CE breakdown to 60V. The common mode voltage range of he error-amp has been raised to 5.5V to eliminate the need or a resistive divider from the 5V reference.
In the LM3524D the circuit bias line has been isolated from he shut-down pin. This prevents the oscillator pulse amplitude nd frequency from being disturbed by shut-down. Also t high frequencies (@300 kHz) the max. duty cycle per output as been improved to 44% compared to 35% max. duty ycle in other 3524s.
In addition, the LM3524D can now be synchronized externally, hrough pin 3. Also a latch has been added to insure ne pulse per period even in noisy environments. The M3524D includes double pulse suppression logic that insures hen a shut-down condition is removed the state of he T-flip-flop will change only after the first clock pulse has rrived. This feature prevents the same output from being ulsed twice in a row, thus reducing the possibility of core aturation in push-pull designs.
LM324D Maximum Ratings
If Military/Aerospace specified devices are required, lease contact the National Semiconductor Sales Office/ istributors for availability and specifications. Supply Voltage 40V Collector Supply Voltage (LM2524D) 55V (LM3524D) 40V Output Current DC (each) 200 mA Oscillator Charging Current (Pin 7) 5 mA Internal Power Dissipation 1W Operating Junction Temperature Range (Note 2) LM2524D 40 to +125 LM3524D 0 to +125 Maximum Junction Temperature 150° Storage Temperature Range 65 to +150 Lead Temperature (Soldering 4 sec.) M, N Pkg. 260
LM324D Features
· Fully interchangeable with standard LM3524 family · ±1% precision 5V reference with thermal shut-down · Output current to 200 mA DC · 60V output capability · Wide common mode input range for error-amp · One pulse per period (noise suppression) · Improved max. duty cycle at high frequencies · Double pulse suppression · Synchronize through pin 3