TL2843B-Q1 CONTROLLER Datasheet

TL2843B-Q1 Datasheet, PDF, Equivalent


Part Number

TL2843B-Q1

Description

HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER

Manufacture

etcTI

Total Page 18 Pages
Datasheet
Download TL2843B-Q1 Datasheet


TL2843B-Q1
TL2843B-Q1
www.ti.com
SLVSAE2A JULY 2010 REVISED FEBRUARY 2012
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER
Check for Samples: TL2843B-Q1
FEATURES
1
Qualified for Automotive Applications
Low Start-Up Current (<0.5 mA)
Trimmed Oscillator Discharge Current
Current Mode Operation to 500 kHz
Automatic Feed-Forward Compensation
Latching PWM for Cycle-by-Cycle Current
Limiting
Internally Trimmed Reference With
Undervoltage Lockout
High-Current Totem-Pole Output Undervoltage
Lockout With Hysteresis
Double-Pulse Suppression
DESCRIPTION
The TL284xB 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.
Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is 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 N-channel MOSFETs, is low
when it is in the off state.
The TL284xB series are pin compatible with the standard TL284x with the following improvements. The start-up
current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In
addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while
sinking 10 mA (VCC = 5 V).
Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.
Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TL2842B and TL2844B devices make them ideally
suited to off-line applications. The corresponding typical thresholds for the TL2843B and TL2845B devices are
8.4 V (on) and 7.6 V (off). The TL2842B and TL2843B devices can operate to duty cycles approaching 100%. A
duty-cycle range of 0% to 50% is obtained by the TL2844B and TL2845B by the addition of an internal toggle
flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for
operation from 40°C to 125°C.
TA
40°C to 125°C SOIC D
Table 1. ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
TL2842BQDRQ1
Reel of 2500
TL2843BQDRQ1
TL2844BQDRQ1
TL2845BQDRQ1
TOP-SIDE MARKING
Product Preview
TL2843BQ
Product Preview
Product Preview
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 20102012, Texas Instruments Incorporated

TL2843B-Q1
TL2843B-Q1
SLVSAE2A JULY 2010 REVISED FEBRUARY 2012
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
VCC 12
FUNCTIONAL BLOCK DIAGRAM
34 V NOM
GND 9
−+
UVLO
5-V VREF
EN
7
RT/CT
2.5 V
OSC
VREF
Good
Logic
Internal
Bias
3
VFB
COMP 1
ISENSE 5
Error
Amplifier
+
2R
R
T
S
R
1V
Current-
Sense
Comparator
PWM
Latch
14 VREF
10 OUTPUT
2 Submit Documentation Feedback
Copyright © 20102012, Texas Instruments Incorporated
Product Folder Link(s): TL2843B-Q1


Features TL2843B-Q1 www.ti.com SLVSAE2A – JUL Y 2010 – REVISED FEBRUARY 2012 HIGH-P ERFORMANCE CURRENT-MODE PWM CONTROLLER Check for Samples: TL2843B-Q1 FEATURES 1 • Qualified for Automotive Applica tions • Low Start-Up Current (<0.5 mA ) • Trimmed Oscillator Discharge Curr ent • Current Mode Operation to 500 k Hz • Automatic Feed-Forward Compensat ion • Latching PWM for Cycle-by-Cycle Current Limiting • Internally Trimme d Reference With Undervoltage Lockout High-Current Totem-Pole Output Under voltage Lockout With Hysteresis • Dou ble-Pulse Suppression DESCRIPTION The TL284xB series of control integrated ci rcuits provide the features that are ne cessary to implement off-line or dc-to- dc fixed-frequency current-mode control schemes, with a minimum number of exte rnal components. Internally implemented circuits include an undervoltage locko ut (UVLO) and a precision reference tha t is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a.
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