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UC3827QTR-2 Datasheet

  • UC3827QTR-2

  • Current/Voltage-Mode SMPS Controller

  • 117.86KB

  • 7頁(yè)

  • ETC

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UC1827-1/-2
UC2827-1/-2
UC3827-1/-2
Buck Current/Voltage Fed Push-Pull PWM Controllers
FEATURES
鈥?/div>
Ideal for Multiple Output and/or High
Voltage Output Voltage Converters
鈥?/div>
Up to 500kHz Operation
鈥?/div>
High Voltage, High Current Floating
Driver for Buck Converter Stage
鈥?/div>
UC3827-1 Current Fed Controller has
Push-Pull Drivers with Overlapping
Conduction Periods
鈥?/div>
UC3827-2 Voltage Fed Controller has
Push-Pull Drivers with
Non-overlapping Conduction Periods
鈥?/div>
Average Current Mode, Peak Current
Mode or Voltage Mode with Input
Voltage Feedforward Control for Buck
Power Stage
鈥?/div>
Wide Bandwidth, Low Offset,
Differential Current Sense Amplifier
鈥?/div>
Precise Short Circuit Current Control
DESCRIPTION
The UC3827 family of controller ICs provides an integrated control solution
for cascaded buck and push-pull converters. These converters are known
as current fed or voltage fed push-pull converters and are ideally suited for
multiple output and/or high voltage output applications. In both current fed
and voltage fed modes, the push-pull switches are driven at 50% nominal
duty cycles and at one half the switching frequency of the buck stage. In
the current fed mode, the two switches are driven with a guaranteed over-
lap period to prevent ringing and voltage stress on the devices. In the volt-
age fed mode, the two switches are driven with a guaranteed gap time
between the switches to prevent shorting the transformer across the en-
ergy storage capacitor and to prohibit excessive currents flowing through
the devices.
The converter鈥檚 output voltage is regulated by pulse width modulation of
the buck switch. The UC3827 contains complete protection and PWM con-
trol functions for the buck converter. Easy control of the floating switch is
accomplished by the floating drive circuitry. The gate drive waveform is
level shifted to support an input voltage up to 72Vdc.
(continued)
BLOCK DIAGRAM
VEAO
10
VOLTAGE ERROR
AMPLIFIER
VEA+
VEA鈥?/div>
CEA鈥?/div>
CSAO
CSA+
CSA鈥?/div>
SS
SYNC
CT
RT
REF
VCC
14
16
13
7
+3V
8
9
4
19
18
17
15
23
REF
&
UVLO
OSC
500kHz
MAX
T
Q
PUSH-PULL
DRIVERS
24
PUSH
ILIM
COMPARATOR
SS
INHBT
UV
Q
DELAY
21
PGND
S
Q
PWM
COMPARATOR
R
D
FLYING
DRIVER
CURRENT
ERROR
AMPLIFIER
0.7V
CEA+
12
CEAO
6
RAMP
5
1
2
3
V+
BUCK
SRC
CURRENT
SENSE AMPLIFIER
OSC
GND
11
UVLO
DELAY
22
PULL
20
DELAY
UDG-97172
04/99
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