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FAN5617 データシート(PDF) 8 Page - Fairchild Semiconductor

部品番号 FAN5617
部品情報  High-Efficiency, Constant-Current LED Driver with TinyWire Brightness Control
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5617 データシート(HTML) 8 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5617 Rev. 1.0.1
Circuit Description (Continued)
IDLE
T
BIT
LOGIC 1
LOGIC 0
BIT 0
BIT 1
BIT 4
T
LOW
T
RESET
IDLE
T
BIT
STOP BIT
DATA
LATCHED
T
HIGH
Figure 13.
TinyWire™ Protocol Timing
NBR data is shifted in LSB first on the DATA line, as
shown in Figure 13. The TinyWire protocol operates
over a wide range of TBIT times (see Table 3), allowing
easy encoding of the brightness control bit-stream using
a microcontroller software “bit-bang” loop.
The 5-bit control word begins with the falling edge of
DATA. If DATA is HIGH for a greater percentage of the
time than it is low between falling edges, the bit is a “1.”
If DATA is LOW longer than it is HIGH, the bit is a “0.”
Observe the following timing rules to ensure proper data
transmission:
BIT =
TLOW
THIGH
0
> 75% TBIT
< 25% TBIT
1
< 25% TBIT
> 75 % TBIT
Table 2. Data Bit Definition
MIN.
MAX.
TLOW
500ns
40
μs
THIGH
500ns
40
μs
TRESET
100
μs
Table 3. Timing Requirements
Time
BIT =
TLOW
THIGH
TBIT
MIN.
0
1500ns
500ns
2
μs
MAX.
0
40
μs
13
μs
53
μs
MIN.
1
500ns
1500ns
2
μs
MAX.
1
13
μs
40
μs
53
μs
Table 4. Minimum and Maximum Bit Times
Each falling edge of DATA clocks in the value of its
preceding bit, necessitating a STOP pulse of at least
TLOW(MIN) width. The command word, NBR (see Table 1.
NBR Data Dimming Values)
, transfers to the internal
registers and is valid at the rising edge of the STOP bit. A
RESET is generated to the internal bit counters after the
DATA line remains high for at least 100
μs. If less than five
bits are received before the RESET occurs, no new data
is transferred to the internal registers. If more than five bits
are received before RESET, the first five bits are
transferred at the rising edge of the sixth bit and
subsequent bits are ignored.
Short-Circuit and Thermal Protection
In the event of an output voltage short circuit, the output
current is limited to a typical value of 65mA.
In addition, when the die temperature exceeds 150°C, a
reset occurs and remains in effect until the die cools
down to 135°C; at which time, the circuit restarts and
resumes normal operation.
Selecting Capacitors
It is important to select the appropriate capacitor types
and values for the FAN5617 circuit design. To reduce
battery ripple, both CIN and COUT should be low-ESR
capacitors. If necessary, the ripple can be further
reduced by powering the IC through an RC input filter,
as shown in Figure 14.
FAN5617
VIN
GND
0.5
Ω
BATTERY
10
μ
+
4.7
μ
Figure 14. Battery Ripple Reduction
CAP1 and CAP2 should be MLCC capacitors of 0.1µF
to 1µF for best efficiency in boost mode. For better ILED
regulation, 1µF bucket capacitors are recommended,
particularly when ILED > 25mA and the battery
discharges below 3V.
PCB Layout Considerations
For best performance, a solid ground plane is
recommended on the back side of the PCB. All
capacitors should be placed as close to the IC as
possible and connected with reasonably thick traces to
minimize the ESL and ESR parasitics.


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