CS3341 datasheet(6/8 Pages) ONSEMI

6 / 8 page

CS3341, CS3351, CS387

http://onsemi.com

REGULATION WAVEFORMS

The CS3341/3351/387 utilizes proportion control to

maintain regulation. Waveforms depicting operation are

shown in Figures 4, 5 and 6, where VBAT/N is the divided

down voltage present on the Sense pin using R1 and R2

(Figure 7). A sawtooth waveform is generated internally.

The amplitude of this waveform is listed in the electric

parameter section as proportion control. The oscillator

voltage is summed with VBAT/N, and compared with the

internal voltage regulator (VREG) in the regulation

comparator which controls the field through the output

“Device Driver.”

Figure 4 shows typical steady–state operation. A 50%

duty cycle is maintained.

Figure 5 shows the effect of a drop in voltage on (VBAT/N

+ VOSC). Notice the duty cycle increase to the field drive.

Figure 6 shows the effect of an increase in voltage (above

the regulation voltage) on (VBAT/N + VOSC). Notice the

decrease in field drive.

Figure 4. 50% Duty Cycle,

Steady State

Figure 5. > 50% Duty Cycle,

Increased Load

Figure 6. < 50% Duty Cycle,

Decreased Load

VREG

VBAT/N + VOSC

VREG

VBAT/N + VOSC

Field Driver On

VBAT/N + VOSC

Figure 7. Typical Application DIagram

BATTERY

2N6284

Power

Darlington

POWER GROUND

18 k

Ω

0.1

µF

50 k

Ω

0.047

µF

0.022

µF

20 k

Ω

2.4 k

Ω

GND

Driver

STATOR

RECTIFIER

FIELD

Lamp Indicator

R10

510

Ω

IGNITION

SWITCH

MPSA13

or CS299

*Note: C2 optional for reduced jitter.

LAMP

VCC

Sense

OSC

IGN

*C2

µF

100 k

Ω

R5 10 k

Ω

250

Ω

MR2502

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