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參數(shù)資料
| 型號： | TPS65200YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA36 |
| 封裝： | 2.80 X 2.60 MM, 0.40 MM PITCH, GREEN, DSBGA-36 |
| 文件頁數(shù)： | 18/59頁 |
| 文件大?。?/td> | 2424K |
| 代理商： | TPS65200YFFT |
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I
=
LED
V
FB
R
SET
V = duty cycle VFB
FB
[4:0]
IDAC
FB
CTRL
WLED _EN
VFB [4 :0 ]
D = 1 -
V
IN
V
OUT
www.ti.com
SLVSA48 – APRIL 2010
Current Program
The FB voltage is regulated to a low 200-mV reference voltage. The LED current is programmed externally using
a current-sense resistor in series with the LED string. The value of the RSET is calculated using Equation 1.
(1)
Where:
1. ILED = output current of LEDs
2. VFB = regulated voltage of FB
3. RSET = current sense resistor
The output current tolerance depends on the FB accuracy and the current sensor resistor accuracy.
Brightness Dimming
The TPS65200 offers two methods of LED brightness dimming. When the CTRL pin is constantly high, the FB
voltage is regulated to the value set in the WLED register which ranges from 0 mV to 200 mV and is divided into
32 steps. For applications requiring higher dimming resolution a PWM signal can be applied to the CTRL pin to
reduce this regulation voltage and dim LED brightness. The relationship between the duty cycle and FB voltage
is given by Equation 2.
(2)
Where:
1. Duty = duty cycle of the PWM signal
2. VFB[4:0] = internal reference voltage, default = 200 mV
The IC chops up the internal reference voltage at the duty cycle of the PWM signal and filters it by an internal low
pass filter. The output of the filter is connected to the error amplifier as the reference voltage for the FB pin
regulation. Therefore, although a PWM signal is used for brightness dimming, only the WLED DC current is
modulated, which is often referred to as analog dimming. This eliminates the audible noise which often occurs
when the LED current is pulsed in replica of the frequency and duty cycle of PWM control. The regulation voltage
itself is independent of the PWM logic voltage level which often has large variations.
Figure 45. WLED Analog Dimming Circuit
Inductor Over Current Protection
The over current limit in the boost converter limits the maximum input current and thus maximum input power for
a given input voltage. Maximum output power is less than maximum input power due to power conversion losses.
Therefore, the current limit setting, input voltage, output voltage and efficiency can all change maximum current
output. The current limit clamps the peak inductor current and the maximum DC output current equals the current
limit minus half of the peak-peak current ripple. The ripple current is a function of switching frequency, inductor
value and duty cycle. Equation 3 through Equation 5 are used to determine the maximum output current.
(3)
Where:
1. D = duty cycle of the boost converter
2. VIN = Input voltage
Copyright 2010, Texas Instruments Incorporated
25
Product Folder Link(s): TPS65200
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