3843B资料

TL3843BD-8
SOIC – D (8 pin)
Reel of 2500 Tube of 75
TL3843BDTL3844BDR-8
Tube of 75
TL3845BD-8
Reel of 2500
TL3845BDR-8
Tube of 75
TL3842BD
Copyright © 2006, Texas Instruments Incorporated
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TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610A – AUGUST 2006 – REVISED SEPTEMBER 2006
S
R
CurrentSense
Comparator
PWM Latch
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3
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TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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
RT/CT 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.
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
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.
TOP-SIDE MARKING TL2842BP TL2843BP TL2844BP TL2845BP 2842B
2843B
2844B
2845B
TL2842B
TL2843B
TL2844B
TL2845B TL3842BP TL3843BP TL3844BP TL3845BP 3842B
3843B
3844B
D (SOIC) OR P (PDIP) PACKAGE (TOP VIEW)
COMP 1 VFB 2
ISENSE 3 RT/CT 4
8 VREF 7 VCC 6 OUTPUT
5 GND
D (SOIC) PACKAGE (TOP VIEW)
COMP 1 NC 2
VFB 3 NC 4
ISENSE 5 NC 6
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).
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.
2
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VCC 7
TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610A – AUGUST 2006 – REVISED SEPTEMBER 2006
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
FUNCTIONAL BLOCK DIAGRAM
34 V NOM 5 GND
−+
UVLO
5-V VREF EN
8 VREF
RT/CT 4
2.5 V OSC
VREF Good
Logic
Internal Bias
6 OUTPUT
T
2 VFB COMP 1
Error Amplifier
+ −
2R
R
1V
ISENSE 3 A. Pin numbers shown are for the 8-pin D package.
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
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.
3845B
TL3842B
TL3843B
TL3844B
TL3845B
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at /sc/package.
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TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610A – AUGUST 2006 – REVISED SEPTEMBER 2006
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

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
Limiting
• Internally Trimmed Reference With Undervoltage Lockout
• High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
• Double-Pulse Suppression