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TL2842, TL2843, TL2844, TL2845
TL3842, TL3843, TL3844, TL3845
SLVS038I – JANUARY 1989 – REVISED JULY 2016
TLx84x Current-Mode PWM Controllers
1 Features
3 Description












The TL284x and TL384x series of control integrated
circuits provide the features that are necessary to
implement off-line or DC-to-DC fixed-frequency
current-mode control schemes, with a minimum
number of external components. Some of the
internally implemented circuits are an undervoltage
lockout (UVLO), featuring a start-up current of less
than 1 mA, and a precision reference trimmed for
accuracy at the error amplifier input. Other internal
circuits include logic to ensure latched operation, a
pulse-width modulation (PWM) comparator (that 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 Nchannel MOSFETs, is low when it is in the off state.
1
Optimized for Off-Line and DC-to-DC Converters
Low Start-Up Current (< 1 mA)
Automatic Feed-forward compensation
Pulse-by-Pulse Current Limiting
Enhanced Load-Response Characteristics
Undervoltage Lockout With Hysteresis
Double-Pulse Suppression
High-Current Totem-Pole Output
Internally Trimmed Bandgap Reference
500-kHz Operation
Error Amplifier With Low Output Resistance
Designed to be Interchangeable with UC2842 and
UC3842 Series
PART NUMBER
2 Applications


Device Information(1)
Switching regulators of any polarity
Transformer-coupled DC/DC convertors
TLx84x
PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
SOIC (14)
8.65 mm × 3.91 mm
PDIP (8)
9.81 mm × 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Device Pinout Drawing SOIC (14)
COMP
1
14
REF
NC
2
13
NC
VFB
3
12
VCC
NC
4
11
VC
ISENSE
5
10
OUTPUT
NC
6
9
GND
RT/CT