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6.2 Ka3525 Pulse Width Modulator

The KA3525 IC is a pulse width modulator that contains all the necessary control circuits to implement switching regulators and power control applications. It includes a voltage regulator, control amplifier, oscillator, pulse width modulator, output switches, and protection circuits. The IC provides PWM power control with operation over 100kHz, 2% frequency stability, and on-chip protections against overheating and overcurrent.

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2K views4 pages

6.2 Ka3525 Pulse Width Modulator

The KA3525 IC is a pulse width modulator that contains all the necessary control circuits to implement switching regulators and power control applications. It includes a voltage regulator, control amplifier, oscillator, pulse width modulator, output switches, and protection circuits. The IC provides PWM power control with operation over 100kHz, 2% frequency stability, and on-chip protections against overheating and overcurrent.

Uploaded by

Karthik Dm
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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6.

2 KA3525 PULSE WIDTH MODULATOR

The KA3525 regulating pulse width modulator contains all of the control
circuit necessary to implement switching regulators of either polarity transformer
coupled DC to DC converters, transformer less polarity converters and voltage
doublers, as well as other power control applications. This device includes a 5V
voltage regulator capable of supplying up to 50mA to external circuit, a control
amplifier, an oscillator, a pulse width modulator, a phase splitting flip-flop, dual
alternating output switch transistors, and current limiting and shut-down circuit. Both
the regulator output transistor and each output switch are internally current limiting
and, to limit junction temperature, an internal thermal shutdown circuit is employed.

6.2.1 PIN DETAILS

Figure 6.2 Pin Details Of IC KA3525


6.2.2 INTERNAL BLOCK DIAGRAM

Figure 6.3 Internal Block Diagram Of IC KA3525

6.2.3 IC KA3525

Figure 6.4 IC DIP package


6.2.4 FEATURES

 Complete PWM power control circuit


 Operation beyond 100KHz
 2% frequency stability with temperature
 Total quiescent current less than 10mA
 Single ended or push-pull outputs
 Current limit amplifier provides external component protection
 On-chip protection against excessive junction temperature and output current
 5V, 50mA linear regulator output available to user

6.2.5 ELECTRICAL CHARACTERISTICS

Table 6.1 Electrical Characteristics Of KA3525 IC

6.2.6 ABSOLUTE MAXIMUM RATINGS


Table 6.2: Absolute Maximum Ratings of KA3525 IC

6.2.7 PWM OSCILLATOR FREQUENCY CALCULATION

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