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TL3845B Datasheet Preview

TL3845B Datasheet

HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

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www.ti.com
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
FEATURES
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
D (SOIC) OR P (PDIP) PACKAGE
(TOP VIEW)
COMP
VFB
ISENSE
RT/CT
1
2
3
4
8 VREF
7 VCC
6 OUTPUT
5 GND
D (SOIC) PACKAGE
(TOP VIEW)
COMP
NC
VFB
NC
ISENSE
NC
RT/CT
1
2
3
4
5
6
7
14 VREF
13 NC
12 VCC
11 VC
10 OUTPUT
9 GND
8 POWER GROUND
NC − No internal connection
DESCRIPTION/ORDERING INFORMATION
The TL284xB and TL384xB 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 and TL384xB series are pin compatible with the standard TL284x and TL384x 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 TLx842B and TLx844B devices make them ideally
suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are
8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A
duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B 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 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.
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 © 2006–2007, Texas Instruments Incorporated




etcTI

TL3845B Datasheet Preview

TL3845B Datasheet

HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

No Preview Available !

TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
www.ti.com
TA
–40°C to 85°C
0°C to 70°C
ORDERING INFORMATION
PACKAGE (1)
ORDERABLE PART NUMBER
TL2842BP
PDIP – P
Tube of 50
TL2843BP
TL2844BP
TL2845BP
Tube of 75
TL2842BD-8
Reel of 2500
TL2842BDR-8
Tube of 75
TL2843BD-8
SOIC – D (8 pin)
Reel of 2500
Tube of 75
TL2843BDR-8
TL2844BD-8
Reel of 2500
TL2844BDR-8
Tube of 75
TL2845BD-8
Reel of 2500
TL2845BDR-8
Tube of 75
TL2842BD
Reel of 2500
TL2842BDR
Tube of 75
TL2843BD
SOIC – D (14 pin)
Reel of 2500
Tube of 75
TL2843BDR
TL2844BD
Reel of 2500
TL2844BDR
Tube of 75
TL2845BD
Reel of 2500
TL2845BDR
TL3842BP
PDIP – P
Tube of 50
TL3843BP
TL3844BP
TL3845BP
Tube of 75
TL3842BD-8
Reel of 2500
TL3842BDR-8
Tube of 75
TL3843BD-8
SOIC – D (8 pin)
Reel of 2500
Tube of 75
TL3843BDR-8
TL3844BD-8
Reel of 2500
TL3844BDR-8
Tube of 75
TL3845BD-8
Reel of 2500
TL3845BDR-8
Tube of 75
TL3842BD
Reel of 2500
TL3842BDR
Tube of 75
TL3843BD
SOIC – D (14 pin)
Reel of 2500
Tube of 75
TL3843BDR
TL3844BD
Reel of 2500
TL3844BDR
Tube of 75
TL3845BD
Reel of 2500
TL3845BDR
TOP-SIDE MARKING
TL2842BP
TL2843BP
TL2844BP
TL2845BP
2842B
2843B
2844B
2845B
TL2842B
TL2843B
TL2844B
TL2845B
TL3842BP
TL3843BP
TL3844BP
TL3845BP
3842B
3843B
3844B
3845B
TL3842B
TL3843B
TL3844B
TL3845B
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
2 Submit Documentation Feedback


Part Number TL3845B
Description HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
Maker etcTI
Total Page 26 Pages
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