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UC2846 Datasheet

  • UC2846

  • Current Mode PWM Controller

  • 10頁(yè)

  • TI

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application
INFO
available
Current Mode PWM Controller
FEATURES
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Automatic Feed Forward Compensation
UC1846/7
UC2846/7
UC3846/7
DESCRIPTION
The UC1846/7 family of control ICs provides all of the necessary
features to implement fixed frequency, current mode control
Programmable Pulse-by-Pulse Current
schemes while maintaining a minimum external parts count. The
Limiting
superior performance of this technique can be measured in im-
Automatic Symmetry Correction in Push-pull proved line regulation, enhanced load response characteristics, and
Configuration
a simpler, easier-to-design control loop. Topological advantages in-
clude inherent pulse-by-pulse current limiting capability, automatic
Enhanced Load Response Characteristics
symmetry correction for push-pull converters, and the ability to par-
Parallel Operation Capability for Modular
allel 鈥減ower modules" while maintaining equal current sharing.
Power Systems
Protection circuitry includes built-in under-voltage lockout and pro-
Differential Current Sense Amplifier with
grammable current limit in addition to soft start capability. A shut-
Wide Common Mode Range
down function is also available which can initiate either a complete
shutdown with automatic restart or latch the supply off.
Double Pulse Suppression
500mA (Peak) Totem-pole Outputs
鹵1%
Bandgap Reference
Under-voltage Lockout
Soft Start Capability
Shutdown Terminal
500kHZ Operation
Other features include fully latched operation, double pulse sup-
pression, deadline adjust capability, and a
鹵1%
trimmed bandgap
reference.
The UC1846 features low outputs in the OFF state, while the
UC1847 features high outputs in the OFF state.
BLOCK DIAGRAM
5.1 V
REFERENCE
REGULATOR
VIN 15
2
VREF
13 VC
SYNC 10
UVLO
LOCKOUT
F/F
Q
11 A OUT
T
Q
UC1846
Output Stage
RT
9
OSC
CT
8
C/S-
3
X3
COMP
S R
Q
S
0.5 V
+
14 B OUT
UC1847
Output Inverted
C/S+
4
0.5 mA
NI
5
E/A
INV
6
12 GND
1
CURRENT
LIMIT ADJUST
16 SHUTDOWN
COMP
7
350 mV
6k
UDG-02057
SLUS352A - JANUARY 1997 - REVISED MARCH 2002

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