MAX1720 Просмотр технического описания (PDF) - ON Semiconductor
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MAX1720 Datasheet PDF : 18 Pages
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MAX1720
A zener diode can be used with the shutdown input to provide closed loop regulation performance. This significantly reduces
the converter’s output resistance and dramatically enhances the load regulation. For closed loop operation, the desired
regulated output voltage must be lower in magnitude than −Vin. The output will regulate at a level of −VZ + V . th(SHDN) Note that
the shutdown input voltage threshold is typically 0.5 Vin and therefore, the regulated output voltage will change proportional
to the converter’s input. This characteristic will not present a problem when used in applications with constant input voltage.
In this case the zener breakdown was measured at 25 mA. The performance characteristics for the above converter are shown
below. Note that the dashed curve sections represent the converter’s open loop performance.
−1.0
−2.0
TA = 25°C
A
−3.0
B
−4.0
Curve
A
B
Vin (V)
3.3 V
5.0 V
Vz (V)
4.5
6.5
Vout (V)
−2.8
−3.8
−5.0
0
10
20
30
40
50
60
Iout, OUTPUT CURRENT (mA)
Figure 31. Load Regulation, Output Voltage vs.
Output Current
1
6
OSC
Vin
+
2
5
3
4
−Vout
+
R1
+
R2
10 k
Capacitors = 10 mF
Figure 32. Line and Load Regulated Negative Output Voltage
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