PL384XAQ8 Datasheet, PDF (5/15 Pages) Cystech Electonics Corp. – High Performance Current Mode PWM Controllers

Spec. No. : C510Q8-A
CYStech Electronics Corp.
Issued Date : 2003.08.12
Revised Date :
Page No. : 5/15
Figure 1: Open Loop Test Circuit
4.7k
ERROR AMP.
ADJUST
1k
4.7k
2N2222
100k
ISENSE
ADJUST
5k
RT
COMP
VFB
VREF
1
8
2
ISENSE
3
RT/CT
4
0.1uF
7
VI
6
OUTPUT
5
GROUND
0.1uF
A
1W
1k
VREF
VI
OUTPUT
CT
GROUND
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass
capacitors should be connected close to pin 5 in a single point ground. The transistor and 5kΩ potentiometer are
used to sample the oscillator waveform and apply an adjustable ramp to pin 3.
Figure 2:Timing Resistor vs Oscillator Frequency
100
CT=100pF
200pF
500pF
10 _10nF
5nF
2nF _1nF
Vi=15V,TA=25
℃
1
10
100
1000
Oscillator Frequency---fosc(kHz)
Figure 3:Output Dead-Time vs Oscillator Frequency
100
CT=2nF
CT=10nF
CT=5nF
CT=1nF
10 ^CT=500p
F
CT=200pF
CT=100pF
Vi=15V
TA=25
1
10
100
1000
Oscillator Frequency---fosc(kHz)
PL384XAQ8
CYStek Product Specification