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參數資料
| 型號： | TL2845BQDRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | PLASTIC, MS-012AB, SOIC-14 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 300K |
| 代理商： | TL2845BQDRQ1 |
1
2
3
4
5
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8
GND
OUTPUT
V
CC
V
REF
R /C
T
I
SENSE
VFB
COMP
D PACKAGE
(TOP VIEW)
www.ti.com
SLVSAE2 – JULY 2010
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER
Check for Samples: TL2843B-Q1
1
FEATURES
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.
Table 1. ORDERING INFORMATION(1)
TA
PACKAGE(2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
TL2842BQDRQ1
Product Preview
TL2843BQDRQ1
TL2843BQ
–40°C to 125°C
SOIC – D
Reel of 2500
TL2844BQDRQ1
Product Preview
TL2845BQDRQ1
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.
Copyright 2010, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TL2845D | 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TL2845D-8 | 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TL2845DE4 | 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TL2845DE4-8 | 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TL2845DG4 | 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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