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参数资料
| 型号： | FAN5346S30X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR ASYNC SER BOOST 6SSOT |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 白色 LED |
| 频率： | 950kHz ~ 1.35MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 6.2 V ~ 28.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | FAN5346S30XDKR |
Circuit Description
Overview
The FAN5346 is an inductive current-mode boost serial
LED driver that achieves LED current regulation by
maintaining 0.250V across the R SET resistor. The current
through the LED string (I LED ) is given by:
I LED =
0 . 250
R SET
(1)
The voltage V OUT is determined by the sum of the forward
voltages across each LED, plus the voltage across R SET ,
which is always 250mV.
Driving Eight LEDs in Series
FAN5346S30X can drive 8 LEDs in series, but the minimum
input voltage (V IN ) must be greater than or equal to 2.9V,
while the forward voltage of the white LED should be less
than or equal to 3.2V, and the maximum LED current
cannot exceed 20mA to maintain stable operation.
UVLO and Soft-Start
If EN has been LOW for more than 1ms, the IC may
initiate a “cold start” soft-start cycle when EN rises,
provided V IN is above the UVLO threshold.
PWM Dimming
The FAN5346 uses a PWM signal to directly modulate
output current in the LED string to vary the perceived LED
brightness. When the EN pin is held HIGH, the FB voltage
is 250mV. This voltage is reduced when a PWM signal is
applied to the EN pin, thereby enabling the LEDs to be
dimmed. The FB voltage is given by the equation:
V FB = DutyCycle × 250 mV (2)
where DutyCycle = the duty cycle of the PWM signal
and 250mV is the internal reference voltage.
Figure 28 illustrates how the FAN5346 divides the internal
250mV reference voltage at the duty cycle of the PWM
signal. A low-pass filter filters the PWM signal, which then
is input into the error amplifier as the reference voltage for
the FB pin.
? 2011 Fairchild Semiconductor Corporation
FAN5346 ? Rev. 1.0.1
Figure 28. Block Diagram of FB and EN Circuit for
PWM Dimming
Over-Current and Short-Circuit Detection
The boost regulator employs a cycle-by-cycle peak inductor
current limit of 300mA (typical) and 750mA (typical) for
FAN5346S20X and FAN5346S30X, respectively.
Over-Voltage / Open-Circuit Protection
If the LED string is an open circuit, FB remains at 0V and the
output voltage continues to increase in the absence of an over-
voltage protection (OVP) circuit. The FAN5346S20X OVP
circuit disables the boost regulator when V OUT exceeds 20V
and continues to keep the regulator off until V OUT drops below
19V. For FAN5346S30X, the OVP is 30V and it turns back on
when V OUT is below 29V
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs and
remains in effect until the die cools to 115°C; at which time, the
circuit is allowed to begin the soft-start sequence.
www.fairchildsemi.com
10
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