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參數(shù)資料
| 型號(hào)： | TPS65810RTQT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 9-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56 |
| 封裝： | 8 X 8 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數(shù)： | 76/99頁 |
| 文件大小： | 2128K |
| 代理商： | TPS65810RTQT |
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SM3CONVERTER
>50%DUTY CYCLE
REPETITIONPERIOD
SM3CONVERTER
50%DUTY CYCLE
SM3CONVERTER
<50%DUTY CYCLE
SM3 Control Logic Overview
Peak Current Control (Boost Converter)
I
P(typ) + IMAX(L3) )
V(OUT)
L
100 ns, or : I
P(typ) + 500 mA )
V(OUT)
L
100 ns
(8)
Soft Start
SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007
Figure 54. Example of Distinct Duty Cycles
The repetition period can be set using the register SOFT_RESET control bit SM3_LF_OSC to either 183 Hz (HI)
or 122 Hz (LO). Each repetition period has a total of 256 pulses, enabling a resolution of 0.4% when
programming the duty cycle.
The SM3 boost converter operates in a pulse frequency modulation (PFM) scheme with constant peak current
control. This control scheme maintains high efficiency over the entire load current range and enables the use of
small external components, as the switching frequency can reach up to 1 MHz depending on the load conditions.
The LED current ripple is defined by the external inductor size.
The converter monitors the sense voltage at pin FB3, and turns on the integrated power stage switch when V(FB3)
is below the 250-mV (typ) internal reference voltage and the LED Switch is ON, starting a new cycle. The
integrated power switch turns off when the inductor current reaches the internal 500-mA (typ) peak current limit,
or if the switch is on for a period longer than the maximum on-time of 6
s (typ). The integrated power switch
also turns off when the LED switch is set to OFF. As the integrated power switch is turned off, the external
Schottky diode is forward biased, delivering the stored inductor energy to the output. The main switch remains off
until the FB3 pin voltage is below the internal 250-mV reference voltage and the LED switch is turned ON, when
it is turned on again.
This PFM peak current control scheme sets the converter in discontinuous conduction mode (DCM), and the
switching frequency depends on the inductor, input/output voltage and LED current. Lower LED currents reduce
the switching frequency, with high efficiency over the entire LED current range. This regulation scheme is
inherently stable, allowing a wide range for the selection of the inductor and output capacitor.
The SM3 integrated power stage switch is turned on until the inductor current reaches the dc current limit IMAX(L3)
(500 mA, typ). Due to internal delays, typically around 100 ns, the actual current exceeds the DC current limit
threshold by a small amount. The typical peak current limit can be calculated as shown in Equation 8
The current overshoot is directly proportional to the input voltage, and inversely proportional to the inductor
value.
All inductive step-up converters exhibit high in-rush current during start-up. If no special precautions are taken,
voltage drops can be observed at the input supply rail during start-up, with unpredictable results in the overall
system operation.
The SM3 boost converter limits the inrush current during start-up by increasing the current limit in three steps:
1. 125 mA (typ),
2. 250 mA (typ) and
3. 500 mA (typ)
The two initial steps (125 mA and 250 mA) are active for 256 power stage switching cycles.
78
Copyright 2006–2007, Texas Instruments Incorporated
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參數(shù)描述 |
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| TPS65810RTQTG4 | 功能描述:電池管理 Int Sgl-Cell Lit-Ion Batt & Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQR | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQRG4 | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQT | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQTG4 | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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