24
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| R8 |
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| VIN = 13.93 V to 25 V | ||
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| 100 kΩ −INE1 8 |
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| OUTC1 10 |
| <Error Amp1> |
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| (at 3 cell) |
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| C10 | <Current Amp1> |
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| VIN = 17.65 V to 25 V | |||||||
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| 5600 pF |
| + | INC1 13 | + | VREF |
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| (at 4 cell) |
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| R9 | A |
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| − |
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| −INC1 12 | ⋅ 20 |
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| IIN |
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| R14 | 10 kΩ | B |
| − | + |
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| VCC (O) |
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| R12 |
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| + |
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| 21 |
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| AC Adaptor | ||||
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| 1 kΩ | 30 kΩ |
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| INE1 9 |
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| C5 |
| + | |||
R16 |
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R15 | R13 |
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| <PWM Comp.><OUT> | 0.1 ∝F |
| C1 |
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200 kΩ |
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| 22 ∝F |
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120 | Ω | 20 kΩ |
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| FB1 7 |
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| Q2 |
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| + |
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| A | B | |
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| + |
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| OUT |
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| −INE2 4 |
| + |
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SW |
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| C8 |
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| − |
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| Drive | 20 | Q1 |
| I1 |
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| 10000 pF |
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| L1 |
| R1 | VO | |
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| R7 | OUTC2 2 |
| <Error Amp2> |
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| <Current Amp2> |
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| 22 ∝H | 0.033 Ω | |||||||
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| R4 22 kΩ |
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| VCC |
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| 82 kΩ |
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| +INC2 24 | + | VREF |
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| Battery | |||
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| D1 |
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| ⋅ 20 | − |
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| VH | + | + |
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| 1 |
| Bias |
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| R5 |
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| − |
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| 19 |
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| C3 |
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| −INC2 |
| + | Voltage | (VCC − 6 V) |
| C2 |
| |||||
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| 330 kΩ |
| +INE2 3 |
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| <VH> |
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| 100 ∝F | 100 ∝F |
| |||
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| R10 | R6 |
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| 68 kΩ |
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| 2.5 V |
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| |
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| 30 kΩ |
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| FB2 5 |
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| Output voltage (Battery |
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| 1.5 V |
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| R11 |
| R19 |
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| <Error Amp3> | <UVLO> |
| VCC |
| voltage) is adjustable |
| ||
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| 30 kΩ | 100 kΩ |
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| R18 |
| −INE3 16 |
| VREF |
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| |
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| 200 kΩ |
|
| − | (VCC UVLO) |
| 215 kΩ |
| Note: |
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| C6 |
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| + |
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| Set output voltage so | |||
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| 1500 pF |
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| + |
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| R17 |
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| + |
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| R3 |
| 11 |
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| 35 kΩ |
| that voltage applied to | ||||||
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| 100 kΩ |
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| − |
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| 330 kΩ | OUTD |
| 4.2 V |
|
| OUTD terminal is 17 V or | ||||||||
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| 0.91 V |
| less. |
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| (0.77 V) |
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FB3 15 |
| VREF |
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| <SOFT> |
| UVLO |
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| |
| VREF |
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| 10 |
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| ∝A |
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| VCC | VCC |
|
CS | 22 | 4.2 V |
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C4 |
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| 18 |
| |
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| C7 | ∝F | |
0.022 ∝F | <OSC> | <REF> | <CTL> | 0.1 | ||
| 14 CTL |
| ||||
| 45 pF |
| VREF |
|
| |
|
| bias | 5.0 V |
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| |
| 17 | 6 |
| 23 |
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| RT | VREF | GND |
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| R2 |
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| 47 kΩ |
| C9 |
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| ∝F |
|
| |
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| 0.1 |
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| |
■ APPLICATION EXAMPLE
MB3887
