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UC1525AL Datasheet(PDF) 9 Page - Texas Instruments

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No. de Pieza. UC1525AL
Descripción  REGULATING PULSE WIDTH MODULATORS
Descarga  17 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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UC1525AL Datasheet(HTML) 9 Page - Texas Instruments

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Shutdown Options (See Block Diagram)
RD = 0
CT = .01 µF
CT = .02 µF
CT = .05 µF
CT = 0.1 µF
CT = 1 nF
CT = 5 nF
CT = 2 nF
6
5
7
RT
RD
CT
200
100
50
20
10
5
2
1 2
5 10
20 50 100 200 1ms 2ms 5ms10ms
Charge Time − ms
500
400
300
200
100
0
0.2
0.5
1
2
5
10
20
50 100 200
Charge Time − ms
CT = 1 nF
CT = 2 nF
CT = 5 nF
CT = .01 µF
CT = .05 µF
CT = 0.1 µF
CT = .02 µF
125
°C
25
°C
−55
°C
Max RD For a Given RT,
Min RT For a Given RD
500
400
300
200
100
0
2
4
6
8
10
12
Minimum Recommended RT − kW
RL = ∞
RL = 1 MΩ
RL = 300 kΩ
RL = 100 kΩ
RL = 30 kΩ
Voltage Gain
Phase
80
60
40
20
0
100
1 k
10 k
100 k
1 M
10 M
f − Frequency − Hz
−360
°
−270
°
−180
°
VIN = 20 V,
TJ = 25°C
UC1525A, UC1527A
UC2525A, UC2527A
UC3525A, UC3527A
SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008
PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS (continued)
Since both the compensation and soft-start terminals (Pins 9 and 8) have current source pull-ups, either can
readily accept a pull-down signal which only has to sink a maximum of 100 A to turn off the outputs. This is
subject to the added requirement of discharging whatever external capacitance may be attached to these pins.
An alternate approach is the use of the shutdown circuitry of Pin 10 which has been improved to enhance the
available shutdown options. Activating this circuit by applying a positive signal on Pin 10 performs two functions;
the PWM latch is immediately set providing the fastest turn-off signal to the outputs; and a 150-A current sink
begins to discharge the external soft-start capacitor. If the shutdown command is short, the PWM signal is
terminated without significant discharge of the soft-start capacitor, thus, allowing, for example, a convenient
implementation of pulse-by-pulse current limiting. Holding Pin 10 high for a longer duration, however, will
ultimately discharge this external capacitor, recycling slow turn-on upon release.
Pin 10 should not be left floating as noise pickup could conceivably interrupt normal operation. All transitions of
the voltage on pin 10 should be within the time frame of one clock cycle and not repeated at a frequency higher
than 10 clock cycles.
Oscillator Charge Time vs RT and CT
Oscillator Discharge Time vs RT CT
Figure 8.
Figure 9.
Maximum Value RD vs Minimum Value RT
Error Amplifier Voltage Gain and Phase vs Frequency
Figure 10.
Figure 11.
Copyright © 1997–2008, Texas Instruments Incorporated
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Product Folder Link(s): UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A


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