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L4978 Datasheet(PDF) 2 Page - STMicroelectronics |
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L4978 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 13 page L4978 2/13 Table 2. Block Diagram Figure 3. Pins Connection (Top view) Table 3. Pin Description N° Pin Name Function 1 2 GND Ground 2 3 SS_INH A logic signal (active low) disables the device (sleep mode operation). A capacitor connected between this pin and ground determines the soft start time. When this pin is grounded disables the device (driven by open collector/drain). 3 4 OSC An external resistor connected between the unregulated input voltage and this pin and a capacitor connected from this pin to ground fix the switching frequency. (Line feed forward is automatically obtained) INHIBIT SOFTSTART VOLTAGES MONITOR THERMAL SHUTDOWN E/A PWM 3.3V OSCILLATOR R S Q INTERNAL REFERENCE INTERNAL SUPPLY 3.3V 5.1V DRIVE CBOOT CHARGE CBOOT CHARGE AT LIGHT LOADS 2 7 8 FB COMP SS_INH 3 1 4 6 5 BOOT OSC GND OUT VCC D97IN594 GND SS_INH OSC OUT 1 3 2 4 VCC BOOT COMP FB 8 7 6 5 D97IN595 N.C. GND SS_INH OSC OUT N.C. OUT N.C. N.C. N.C. BOOT VCC COMP FB N.C. N.C. 1 3 2 4 5 6 7 8 14 13 12 11 10 9 15 16 D97IN596 DIP-8 SO16W |
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