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UC3846N Datasheet(PDF) 8 Page - Texas Instruments

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Part No. UC3846N
Description  Current Mode PWM Controller
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

UC3846N Datasheet(HTML) 8 Page - Texas Instruments

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15
10
9
8
OSC
3
4
+
X3
+
+
5
6
+
E/A
7
COMP
INV
NI
C/S+
C/S-
CT
RT
SYNC
VIN
5.1-V
REFERENCE
REGULATOR
UVLO
LOCKOUT
2
VREF
13
11
VC
A OUT
14
12
B OUT
GND
Q
Q
T
S
S
R
Q
1
+
16
6 k:
0.5 mA
350 mV
0.5 V
F/F
CURRENT LIMIT
ADJUST
SHUTDOWN
UC1846
Output Stage
UC1847
Output Inverted
COMP
UC1846, UC1847, UC2846
UC2847, UC3846, UC3847
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
www.ti.com
7 Detailed Description
7.1 Overview
The UCx846/7 family of control devices provides the necessary features to implement off-line or DC-to-DC fixed-
frequency, current-mode control schemes with a minimal external parts count. Internally implemented circuits
include under-voltage lockout featuring start-up current less than 1 mA, a precision reference trimmed for
accuracy at the error amplifier input, logic to insure latched operation, a PWM comparator which also provides
current limit control, and a totem pole output stage designed to source or sink high-peak current. The output
stage, suitable for driving either N-Channel MOSFETs or bipolar transistor switches, is low in the off state.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Current Sense Amplifier
The current sense amplifier may be used in a variety of ways to sense peak switch current for comparison with
an error voltage. Referring to Functional Block Diagram, maximum swing on the inverting input of the PWM
comparator is limited to approximately 3.5 V by the internal regulated supply. Accordingly, for a fixed gain of 3,
maximum differential voltages must be kept below 1.2 V at the current sense inputs.
8
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Copyright © 1997–2015, Texas Instruments Incorporated
Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847


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