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參數(shù)資料
| 型號： | TL5002CD |
| 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, SOIC-8 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 481K |
| 代理商： | TL5002CD |
TL5002
PULSEWIDTHMODULATION CONTROL CIRCUIT
SLVS304A SEPTEMBER 2000 REVISED AUGUST 2002
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
voltage reference
A 2.5-V regulator operating from VCC is used to power the internal circuitry of the TL5002.
error amplifier
The error amplifier compares a sample of the dc-to-dc converter output voltage to an external reference voltage
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)
To PWM
Comparator
4
VI(FB)
3
+
R2
R1
COMP
INV
Compensation
Network
TL5002
GND
8
5
NI
Vref
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.
oscillator/PWM
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.
dead-time control (DTC)
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
Figure 11 (Voscmax and Voscmin are the maximum and minimum oscillator levels):
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TL5002CDG4 | 功能描述:DC/DC 開關(guān)控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TL5002CDR | 功能描述:DC/DC 開關(guān)控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TL5002CDRG4 | 功能描述:DC/DC 開關(guān)控制器 PWM Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TL5002EVM-180 | 功能描述:EVALUATION MODULE FOR TL5002 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| TL5002EVM-182 | 功能描述:EVAL MOD FOR TL5002 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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