LM317KCS datasheet(14/32 Pages) TI1

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480

Ω

120

Ω

INPUT

OUTPUT

ADJUST

LM317

120

Ω

480

Ω

INPUT

OUTPUT

ADJUST

LM317

12 VI(PP)

6 VO(PP)

2 W (TYP)

240

Ω

INPUT

OUTPUT

ADJUST

LM317

VO = 15 V

1N4002

2.7 k

Ω

µF

50 k

Ω

2N2905

INPUT

OUTPUT

ADJUST

LM317

Ω

LM317

SLVS044W – SEPTEMBER 1997 – REVISED OCTOBER 2014

www.ti.com

System Examples (continued)

9.3.8 50-mA Constant-Current Battery-Charger Circuit

The current limit operation mode can be used to trickle charge a battery at a fixed current. ICHG = 1.25V÷24Ω. VI

should be greater than VBAT + 4.25 V. (1.25V [VREF]+ 3V [headroom])

Figure 19. 50-mA Constant-Current Battery-Charger Circuit

9.3.9 Slow Turn-On 15-V Regulator Circuit

The capacitor C1, in combination with the PNP transistor, helps the circuit to slowly start supplying voltage. In the

beginning, the capacitor is not charged. Therefore output voltage will start at VC1+ VBE + 1.25V = 0V + 0.65V +

1.25V = 1.9V. As the capacitor voltage rises, VOUT will as rise at the same rate. When the output voltage reaches

the value determined by R1 and R2, the PNP will be turned off.

Figure 20. Slow Turn-On 15-V Regulator Circuit

9.3.10 AC Voltage-Regulator Circuit

These two LM317s can regulate both the positive and negative swings of a sinusoidal AC input.

Figure 21. AC Voltage-Regulator Circuit

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