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參數(shù)資料
| 型號： | TL5001AQDRG4Q1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 274K |
| 代理商： | TL5001AQDRG4Q1 |
DETAILED DESCRIPTION
VOLTAGE REFERENCE
ERROR AMPLIFIER
To PWM
Comparator
Vref = 1 V
4
VI(FB)
3
+
R2
R1
COMP
FB
Compensation
Network
TL5001/A
GND
8
OSCILLATOR/PWM
DEAD-TIME CONTROL (DTC)
R
DT
+ (Rt ) 1250) [D(Vosc max * Vosc min) ) Vosc min]
V
RT
; V
RT
+ 1 V
(1)
www.ti.com .............................................................................................................................................. SLVS603B – AUGUST 2005 – REVISED FEBRUARY 2009
A 2.5-V regulator operating from VCC is used to power the internal circuitry of the TL5001A and as a reference for
the error amplifier and SCP circuits. A resistive divider provides a 1-V reference for the error amplifier
noninverting input which typically is within 2% of nominal over the operating temperature range.
The error amplifier compares a sample of the dc-to-dc converter output voltage to the 1-V reference and
generates an error signal for the PWM comparator. The dc-to-dc converter output voltage is set by selecting the
error-amplifier gain (see Figure 1), using the following expression:
VO = (1 + R1/R2) (1 V)
Figure 1. Error-Amplifier Gain Setting
The error-amplifier output is brought out as COMP for use in compensating the dc-to-dc converter control loop for
stability. Because the amplifier can only source 45
A, the total dc-load resistance should be 100 k or more.
The oscillator frequency (fosc) can be set between 20 kHz and 500 kHz by connecting a resistor between RT and
GND. Acceptable resistor values range from 15 k
to 250 k. The oscillator frequency can be determined by
using the graph shown in Figure 5.
The oscillator output is a triangular wave with a minimum value of approximately 0.7 V and a maximum value of
approximately 1.3 V. The PWM comparator compares the error-amplifier output voltage and the DTC input
voltage to the triangular wave and turns the output transistor off whenever the triangular wave is greater than the
lesser of the two inputs.
DTC provides a means of limiting the output-switch duty cycle to a value less than 100%, which is critical for
boost and flyback converters. A current source generates a reference current (IDT) at DTC that is nominally equal
to the current at the oscillator timing terminal (RT). Connecting a resistor between DTC and GND generates a
dead-time reference voltage (VDT), which the PWM/DTC comparator compares to the oscillator triangle wave as
described in the previous section. Nominally, the maximum duty cycle is 0% when VDT is 0.7 V or less and
100% when VDT is 1.3 V or greater. Because the triangle wave amplitude is a function of frequency and the
source impedance of RT is relatively high (1250
), choosing RDT for a specific maximum duty cycle (D) is
accomplished using the following equation and the voltage limits for the frequency in question as found in
Where
RDT and Rt are in , D is in decimal
Copyright 2005–2009, Texas Instruments Incorporated
3
Product Folder Link(s): TL5001A-Q1
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| TL5001AQDRQ1 | 功能描述:軟開關(guān) PWM 控制器 Auto Ctlg Puls Width Mod Contrl Circuit RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| TL5001AQDRQ1E4 | 制造商:Texas Instruments 功能描述: |
| TL5001CD | 功能描述:軟開關(guān) PWM 控制器 PWM w/wide range RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| TL5001CD | 制造商:Texas Instruments 功能描述:PWM CONTROL IC SMD 5001 SOIC8 |
| TL5001CDG4 | 功能描述:軟開關(guān) PWM 控制器 w/Wide Input Voltage Range RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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