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參數(shù)資料
| 型號： | TPS61062YZF |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Male Bullet Solderless Terminal; Wire Size (AWG):16-14; Insulator Color:Blue; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No RoHS Compliant: No |
| 中文描述： | 恒定電流LED驅(qū)動器，帶有數(shù)字和PWM亮度控制 |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 609K |
| 代理商： | TPS61062YZF |
www.ti.com
OVERVOLTAGE PROTECTION (OVP)
As with any current source, the output voltage rises when the output gets high impedance or disconnected. To
prevent the output voltage exceeding the maximum switch voltage rating (33 V) of the main switch, an
overvoltage protection circuit is integrated. As soon as the output voltage exceeds the OVP threshold, the
converter stops switching and the output voltage falls down. When the output voltage falls below the OVP
threshold, the converter continues operation until the output voltage exceeds the OVP threshold again. To allow
the use of inexpensive low-voltage output capacitors, the TPS6106x series has different OVP levels that need to
be selected according to the number of external LEDs and their maximum forward voltage.
ENABLE PWM DIMMING
The enable pin allows disabling and enabling of the device as well as brightness control of the LEDs by applying
a PWM signal up to typically 1 kHz. When a PWM signal is applied, the LED current is turned on when the EN is
high and off when EN is pulled low. Changing the PWM duty cycle therefore changes the LED brightness. To
allow higher PWM frequencies on the enable pin, the device continues operation when a PWM signal is applied.
As shown in the block diagram, the EN pin needs to be pulled low for at least 50 ms to fully turn the device off.
The enable input pin has an internal 300-k
pulldown resistor to disable the device when this pin is floating.
DIGITAL BRIGHTNESS CONTROL (ILED)
The ILED pin features a simple digital interface to allow digital brightness control. This can save processor power
and battery life. Using the digital interface to control the LED brightness does not required a PWM signal all the
time, and the processor can enter sleep mode if available. To save signal lines, the ILED pin can be connected
to the enable pin to allow digital programming and enable/disable function at the same time with the same signal.
Such a circuit is shown in Figure 22.
TPS61060
TPS61061
TPS61062
SLVS538–NOVEMBER 2004
DETAILED DESCRIPTION (continued)
The ILED pin basically sets the feedback regulation voltage (V
FB
); thus, it sets the LED current. When the ILED
pin is connected to GND, the digital brightness control is disabled and the feedback is regulated to V
= 500
mV. When the ILED pin is pulled high, the digital brightness control is enabled starting at its midpoint where the
feedback is regulated to V
FB
= 250 mV. The digital brightness control is implemented by adjusting the feedback
voltage in digital steps with a typical maximum voltage of V
= 500 mV. For this purpose, a 5-bit DAC is used
giving 32 steps equal to a 15.6-mV change in feedback voltage per step. To increase or decrease the internal
reference voltage, the ILED pin needs to be pulled low over time as outlined in Table 1 and specified in the
electrical table. When the internal DAC is programmed to its highest or lowest value, it stays at this value until it
gets programmed in the opposite direction again.
Table 1. Increase/Decrease Internal Reference Voltage
FEEDBACK VOLTAGE
Increase
Decrease
Brightness control disabled
Delay between steps
TIME
ILED LOGIC LEVEL
Low
Low
Low
High
1 μs to 75 μs
180 μs to 300 μs
≥
550 μs
1.5 μs
10
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| TPS61062YZFR | 功能描述:LED照明驅(qū)動器 24V 400mA Switch 1MHz Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61062YZFT | 功能描述:LED照明驅(qū)動器 24V 400mA Switch 1MHz Boost Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61070 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
| TPS61070_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
| TPS61070DDC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
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