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HA16114FP Datasheet(PDF) 6 Page - Hitachi Semiconductor |
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HA16114FP Datasheet(HTML) 6 Page - Hitachi Semiconductor |
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6 / 38 page  HA16114P/PJ/FP/FPJ, HA16120FP/FPJ 6 Guide to the Functional Description The description covers the topics indicated below. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND*1 SYNC RT CT IN( −) E/O IN(+) P.GND*1 Vref ADJ DB ON/ OFF TM CL( −) VIN OUT 1. 2. 3. 4. 5. 6. 7. 8. Oscillator frequency (f ) control and synchronization OSC DC/DC output voltage setting and error amplifier usage Dead-band and soft-start settings Output stage and power MOS FET driving method Vref adjustment, undervoltage lockout, and overcurrent protection Intermittent mode timing during overcurrent Setting of current limit (Top view) Note: 1. ON/ OFF pin usage P.GND is a high-current ( ±1 A maximum peak) ground pin connected to the totem-pole output circuit. GND is a low-current ground pin connected to the Vref voltage reference. Both pins must be grounded. 1. Sawtooth Oscillator (Triangle Wave) 1.1 Operation and Frequency Control The sawtooth wave is a voltage waveform from which the PWM pulses are created (See figure 1). The sawtooth oscillator operates as follows. A constant current I O determined by an external timing resistor RT is fed continuously to an external timing capacitor C T. When the C T pin voltage exceeds a comparator threshold voltage V TH, the comparator output opens a switching transistor, allowing a 3I O discharge current to flow from C T. When the C T pin voltage drops below a threshold voltage VTL, the comparator output closes the switching transistor, stopping the 3I O discharge. Repetition of these operations generates a sawtooth wave. The value of I O is 1.1 V/RT Ω. The IO current mirror has a limited current capacity, so RT should be at least 5 k Ω (I O ≤ 220 µA). Internal resistances R A, RB, and R C set the peak and valley voltages VTH and V TL of the sawtooth waveform at approximately 1.6 V and 1.0 V. |
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Similar Description - HA16114FP |
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