AN8049 Panasonic Semiconductor, AN8049 Datasheet
AN8049
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AN8049 Summary of contents
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... AN8049FHN 1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC Overview The AN8049FHN is a three-channel PWM DC-DC converter control IC that features low-voltage operation. This IC can form a power supply that provides two step- up outputs and one step-down or polarity inverted output with a minimal number of external components. Minimal operating supply voltage of this low as 1 ...
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... AN8049FHN Block Diagram Error 20 k amplifier S.C.P. S.C.P. comp. 18 FB3 Error amplifier 2 0 REF 24 DT3 3 CTL3 Error amplifier 3 1.26 V Pin Descriptions Pin No. Description 1 DT2 2 DT1 3 CTL3 4 CTL2 5 CTL1 6 Off 7 V REF 8 RB2 9 RB1 10 OUT1 11 OUT2 12 GND 2 Reference voltage ...
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... V must Symbol V OFF I SO(OUT) I SI(OUT OUT C SCP R B AN8049FHN Rating 14.2 14 111 150 Range (min.) 40 (max 100 to 1 000 000 1 000 (min.) 750 to 15 000 Unit ...
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... AN8049FHN Electrical Characteristics at V Parameter Reference voltage block Reference voltage Line regulation with input fluctuation Load regulation V temperature characteristics REF V pin short-circuit current REF U.V.L.O. block Circuit operation start voltage Error amplifier 1 block Input threshold voltage 1 Input bias current 1 High-level output voltage 1 ...
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... STBY V THPC CHG SCP V THL V ON(TH OFF OFF V THCTL CTL CTL duty 50% CC(OFF CC(SB) AN8049FHN 0 Min Typ Max 170 190 210 0 0.2 32 ...
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... AN8049FHN Terminal Equivalent Circuit Pin No. Equivalent circuit 1 1. DT2: Sets the channel 2 soft start time. Set the time by connecting a capacitor between this pin and ground. 15 Note that although the channel 2 maximum on duty is set internally to ...
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... REF Outputs the internal reference voltage The reference voltage is 1.26 V (allowance: 1%) when V and I REF least 0.1 F between V ground for phase compensation. AN8049FHN Description ( F)/1 (s) CTL2 . Note that CC ( F)/1 (s) CTL1 . Note that 0.1 mA. Insert a capacitor and ...
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... AN8049FHN Terminal Equivalent Circuit (continued) Pin No. Equivalent circuit 200 200 Description RB2: Connection for a resistor that sets the channel 2 output source current. Use a resistor in the range 750 1 RB1: Connection for a resistor that sets the channel 1 output source current ...
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... Inverting input to the error amplifier 3. 1.5 k FB3: 7 Output from the error amplifier 3. This circuit can provide a source 31 A current sink current of OSC PWM3 0.5 mA (minimum). 0.5 mA min Inverting input to the error amplifier 2. 1.26 V AN8049FHN Description I ...
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... AN8049FHN Terminal Equivalent Circuit (continued) Pin No. Equivalent circuit 1.1 A 1 FB2: Output from the error amplifier OSC PWM2 This circuit can provide a source current sink current of ...
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... IC GND and V CC Allowable V ripple CC Allowable range when Allowable range when ripple voltage V (AC) (V[p-p AN8049FHN , for the package. D and ground }/R .) BEQ3 O(SAT)3 O3 ripple to be within this range pins and 11 ...
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... AN8049FHN Application Notes [1] QFN024-P-0405 package power dissipation 1.200 When mounted on a 4-layer printed circuit board (50 50 t0.8 mm 1.075 R 93.0 C/W th(j a) 1.000 When mounted on a standard printed circuit board (glass epoxy t0 151.5 C/W th(j a) 0.800 0.660 0.600 0.400 0.279 0.200 Independent IC ...
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... 10n 100 10k 100k AN8049FHN f Maximum output duty OSC ( 10k 100k f (Hz) OSC f Maximum output duty OSC ( 10k 100k ...
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... AN8049FHN Application Notes (continued) [3] Timing charts V pin voltage CC waveform 1.67 V S.C.P. pin voltage waveform CTL pin 1.26 V voltage waveform OUT1/2 pin voltage waveform Totem pole circuit output (Step-up output) OUT3 pin voltage waveform Open-collector output (Inverting or step-down output OSC FB Voltage Regulators Output short 1 ...
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... The output voltage V circuit shown in the figure. Rapid charge 1 0.8 (Hz OUT1 R1 can be set using the OUT1 R2 Figure 2. Connection method of error amplifier 1 AN8049FHN Discharge T Figure 1. Triangular oscillator waveform FB1 22 Error amplifier the PWM 1.26 V comparator input ...
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... AN8049FHN Application Notes (continued) [4] Function descriptions (continued) 4. Error amplifier 2 This circuit is an npn-transistor input error amplifier that detects and amplifies the DC-DC converter output voltage, and inputs that signal to a PWM comparator. The 1.26 V internal reference voltage is applied to the noninverting input. Arbi- trary gain and phase compensation can be set up ...
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... CTL block The CTL block output circuit also has a totem pole structure. A constant-current source output with good line regulation can be set up freely by connecting current setting resistors to the RB2 pin. The CTL block can provide a constant-current source output mA. pin. REF AN8049FHN 17 ...
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... AN8049FHN Application Notes (continued) [5] Time constant setup for the timer latch short-circuit protection circuit Figure 6 shows the structure of the timer latch short-circuit protection circuit. The short-circuit protection comparator continuously compares a 0.9 V reference voltage with the FB1, FB2, and FB3 error amplifier outputs. ...
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... Note that it is not possible to control the on/off states of each IC operating in this mode independently only possible to turn all the ICs on or off at the same time remotely. AN8049FHN S.C. AN8049FHN S.C.P. 2 Off pins connected together Figure 7. Slave operation circuit example AN8049FHN OSC pins connected together 19 ...
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... Sequential operation Delays can be provided in the startup times by inserting capacitors (C Delay time: t 1.26 (V) DLY Note that the individual channels can also be turned on or off independently by external signals. These external signals may have voltages in the range AN8049FHN C C CTL3 CTL1 C CTL2 C < ...
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... Voltage Regulators Application Notes (continued) [8] Differences between this IC and the AN8049SH The pin arrangements differ. The AN8049SH is an alternative package version of this IC. AN8049FHN FB2 IN 1 FB1 S.C.P. DT3 AN8049SH AN8049FHN 12 GND 11 OUT2 10 OUT1 9 RB1 8 RB2 21 ...
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... AN8049FHN Application Notes (continued) [9] Error amplifier frequency characteristics 1. Error amplifiers 1 and 2 (Test circuit) 100 Amp.1 4 mV[ P-P] 100 k V 2 Error amplifier 3 (Test circuit Amp.3 4 mV[p- IN+3 100 OUT ...
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... Voltage Regulators Application Circuit Example FB2 FB1 22 S.C.P. 23 DT3 24 AN8049FHN Q3 V REF 12 GND Q2 11 OUT2 10 OUT1 Q1 9 RB1 8 RB2 ...