參數(shù)資料
型號(hào)： PWM5031-I
廠商： Aeroflex Inc.
英文描述： RadHard High Speed PWM Controller
中文描述： RadHard高速PWM控制器
文件頁(yè)數(shù)： 12/17頁(yè)
文件大小： 620K
代理商： PWM5031-I
12
SCD5031 Rev B
OUTPUT DRIVE
Dual push-pull outputs OutA and OutB are provided for driving off chip switches. The output stages are identical:
◆
Totem Pole configuration
◆
Break-before-make switching to prevent harmful cross-conduction spikes
◆
Separate positive and negative supply connections to decouple power stage and sensitive logic
◆
Near rail-to-rail voltage swing
◆
±1A maximum peak current capability (capacitive load)
The outputs have two modes of control depending on whether the 50% toggle option is selected. In the case where the
50% pin is logic low, the outputs are in-phase with each other and the duty cycle is free to take on any value up to 100%.
However, when the 50% pin is asserted high (logic ''1''), the outputs switch from the in-phase condition to the logical
complement (out-of-phase) of each other and the duty cycle is limited to a maximum of 50%.
AUXILIARY AMPLIFIER
The chip includes an uncommitted op-amp with independent shutdown feature for use in any user-defined application.
Some possibilities are:
◆
Signal conditioning of an isolated configuration feedback voltage
◆
Implementation of more sophisticated compensation networks for control loop optimization
The Auxiliary amplifier has a unity gain bandwidth greater than 1MHz and an open loop gain greater than 100dB. The
ENAUX pin is active high such that a logic ''1'' enables the amplifier and logic ''0'' disables it. The amplifier has near
rail-to-rail capability on both the input and output.
FIGURE 8 – Output Saturation Characteristics at +25°C
Voltage
V
1
10
.25
.20
.15
.10
0
.30
100
Current mA
.05
Sink
Source
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