SG3526 查看數據表（PDF） - Motorola => Freescale
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SG3526 Datasheet PDF : 10 Pages
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SG3526
Figure 7. VC Saturation Voltage as a
Function of Sink Current
2.5
2.0
1.5
1.0
0.5
Figure 8. Oscillator Period
200
100 RD = 0 Ω
50
20
10
5.0
0
2.0
2.0
5.0
10
20
50
100 200
IC, SINK CURRENT (mA)
OSCILLATOR PERIOD (ms)
Figure 9. Error Amplifier
VCC
Q6
Vref
Q5
125
µA
Q11
Q3
Q4
14µA
50µA
50µA
100
µA
Q7
Q8 Q9
14µA
Q12
100µA
3 Compensation
Q10 100µA
Q1
Q2
1.0k
500
1.0k
500
– Error
1
+ Error
Figure 10. Undervoltage Lockout
Vref
1.2V
Bandgap
Reference
R1
+
–
R2
To Reset
To Driver A
To Driver B
Sync
PWM
Figure 11. Pulse Processing Logic
SQ
D
Q
Metering
F/F
Memory
F/F
S
RQ
Clock
The metering Flip–Flop is an asynchronous data latch
which suppresses high frequency oscillations by allowing
only one PWM pulse per oscillator cycle.
PWM
The memory Flip–Flop prevents double pulsing in a
push–pull configuration by remembering which output
produced the last pulse.
6
MOTOROLA ANALOG IC DEVICE DATA
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