AN8014 Panasonic Semiconductor, AN8014 Datasheet
AN8014
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AN8014 Summary of contents
Page 1
... IC. This IC can provide any one output type from among step-down, step-up and inverting output. Allowing n-channel power MOSFET direct driv- ing, the AN8014S is ideal for high-efficiency power supplies. Features Wide operating supply voltage range (3 (The voltage is limited within a range between 3.6 V and connected to a step-down volt- age circuit ...
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... AN8014S Pin Descriptions Pin No. Description 1 Internal reference output 2 Oscillator timing resistor connection 3 Oscillator timing capacitor connection 4 Dead-time control 5 Capacitance connection for short-circuit protection delay 6 Error amplifier noninverting input 7 Error amplifier inverting input 8 Error amplifier output Absolute Maximum Ratings Parameter Supply voltage ...
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... OUT DTC INCB CB V THPC V STBY CHG CLM AN8014S Min Typ Max Unit 2.522 2.6 2.678 2.8 3.1 3 140 180 500 25 nA 0.1 0 REF REF 0 ...
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... AN8014S Electrical Characteristics at V Parameter Whole device Total consumption current Standby current Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Reference voltage block Output voltage temperature characteristics 1 Output voltage temperature ...
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... PWM comparator input DTC 4 I DTC C DTC R DTC AN8014S Description V : REF Outputs the reference voltage 2.6 V (allowance: 3%) Incorporating short-circuit protection against ground. RT: Connection for the timing resistor which decides the oscillator frequency. Use a re- sistor in the range 5 The pin voltage is approx ...
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... AN8014S Terminal Equivalent Circuits (continued) Pin No REF I CHG U.V.L.O. output REF REF 0 Equivalent circuit Latch 0. S.C. Source current 8 FB Sink current 10 CLM CLM comp Voltage regulators Description S.C.P.: Connection for the capacitor that sets the soft start period and the timer latch short- circuit protection circuit time constant ...
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... SGND GND Out AN8014S Description SGND: Signal ground. GND: Output stage ground. Out: Totem pole output. A constant output current of 100 peak output current can be ob- tained. CB: Bootstrap output. Connect a bootstrap capacitor between this pin and the n-channel MOSFET source- side pin of the switching element when using a step-down voltage circuit ...
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... The output source currents of the AN8014S's S.C.P. and DTC pins are determined by the timing resistor R which is externally connected to the RT pin. Therefore, note that this IC can not be used for slave when the several ICs are operated in parallel synchronous mode ...
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... When the latch circuit is turned on, the S.C.P. pin will discharge electricity till the voltage on the S.C.P. pin reduces to approximately 30 mV. The latch circuit cannot be, however, reset until power supply to the AN8014S is turned off. ...
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... Discrepancies between the values obtained from the above formulas and the actual values may occur, in which case adjust the values on the mounting substrate. In starting, if the capacitor C are gradually widened, the AN8014S will be in soft-start operation. Thus the overshoot at the output of DC-DC converters can be prevented the DTC pin (pin 5) as shown in figure 4 ...
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... MOSFET is turned on. The cut-off frequency of the filter is obtained from the following [Hz pin. CC (5) Turned on in the next cycle (4) Latch reset In AN8014S 1.32 V 0.44 V High Low Delay time DLY High Low High Low R2 ...
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... N-channel MOSFET (M1) off time: t While the M1 is turned off, the choke coil is provided with energy from the schottky barrier diode (SBD) and the source-side voltage V pin (pin 15) through the AN8014S's internal diode D1. The voltage V on the CB pin (pin 14) is expressed by the following. ...
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... N-channel MOSFET (M1) turn-off time: t The Out pin voltage turns off after rising to the saturation voltage of the AN8014S's internal transistor Q1. The M1 source-side voltage drops to V coupling. Then the M1 will be in the state described in the above 1). [2] Bootstrap circuit usage notes 1 ...
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... AN8014S Application Notes (continued) [3] Timing chart OFF pin voltage Supply voltage (V Internal reference voltage Power supply turning on Triangular wave (CT) S.C.P. pin voltage Out pin waveform Internal reference voltage Short-circuit protection comparator (threshold level) DTC pin voltage Error amplifier output (FB) Triangular wave (CT) Out pin waveform S ...
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... C) D 400 360 Independent IC without a heat sink 300 R 278 C/W thj a P 360 mW ( 207 200 143 100 100 Ambient temperature AN8014S t : Delay time DLY 125 150 1.32 V 0.44 V High Low High Low High Low 15 ...
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... AN8014S Application Notes (continued) [5] Main characteristics Internal reference voltage temperature characteristics 2.63 2.62 2.61 2. Ambient temperature T Output duty ratio DTC pin voltage 100 0.4 0.6 0.8 1.0 DTC pin voltage V DTC Oscillator frequency Timing capacitance 10 000 1 000 R T 100 100 1 000 ...
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... Boot strap PWM comp. Error amp. S.C.P. comp. In Triangular wave OSC Constant Latch current source PWM comp. Error amp. S.C.P. comp. AN8014S 0 CLM Out 100 CLM ...
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... AN8014S Application Circuit Examples (continued) 3. DC-DC converter control (Example of polarity-inverting circuit REF 2.5V 16 On/off OFF active-high R Q U.V.L. Latch Q S S.C. Triangular wave OSC Constant Latch current source PWM comp. Error amp. S.C.P. comp. Voltage regulators 10 CLM Boot In strap ...