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參數(shù)資料
| 型號： | ISL97801ARZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | High Power LED Driver |
| 中文描述： | LED DISPLAY DRIVER, PQCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 707K |
| 代理商： | ISL97801ARZ-T |
15
FN6428.1
April 2, 2007
A Note about Ceramic Capacitors:
Many ceramic capacitors have strong voltage and
temperature coefficients which reduces effective
capacitance as the applied voltage or operating temperature
is increased. Pay careful attention when selecting ceramic
capacitor type. X5R and X7R families provide much better
stability than Y5V, which should generally be avoided unless
additional capacitance is added to compensate for the
significant changes in value which occurs over voltage and
temperature.
Layout Considerations
PCB layout is very important for the converter to function
properly. The following general guidelines should be
followed:
Separate the Power Ground and Signal Ground; connect
them only at one point close to the GND pin.
Maximize the Power Ground area as much as possible. It
is essential to ensure th Power Ground return between
Cin, Cout, and SWS1,2 as least obstructive as possible.
Place the input capacitor close to VIN and SWS1,2 pins in
boost mode.
Make the following PC traces as short as possible:
- from SWD1,2 to the inductor in boost mode
- from SWS1,2 to the inductor in buck mode
- from Cout to PGND
Feedback signals levels are small to improve efficiency.
Ensure the reference connection (GND or VIN) between
the sense resistor and IC pin doesn't carry switching
current.
Place several via holes (thermal vias) under the chip to a
backside ground plane to improve heat dissipation
Maximize the copper area around the thermal vias to
spread heat away from the chip.
Cost-Sensitive Applications
For cost-sensitive applications, the BOM can be reduced
considerably by:
1. Removing temperature compensation
2. Removing the fault-protection switch
3. Removing the load isolation switch
4. Switching the FB into internal fixed bias mode (400mV
across V
FB
)
In this configuration, light level may be controlled using the
EN/PWM input to modulate the output current.
In the absence of the load isolation switch, LED bias current
will vary with PWM duty cycle, due to the discharge of the
output capacitor by the LED’s during the PWM off time
therefore low dimming frequencies can only be used in such
application.
TABLE 4. BOOST MODE COMPENSATION 12V OPERATION
VFB
I
OUT
50mA
VOUT (V)
7
10.5
14
17.5
21
24.5
28
LED’s
2
3
4
5
6
7
8
50mV
Electrolytic
Ceramic
DMIN
DMIN
DMIN
60μF
40μF
40μF
40μF
100mV
100mA
Electrolytic
47μF
47μF
Ceramic
DMIN
DMIN
DMIN
40μF
20μF
40μF
40μF
200mV
350mA
Electrolytic
47μF
47μF
Ceramic
DMIN
DMIN
DMIN
40μF
20μF
40μF
40μF
200mV
1A
Electrolytic
47μF
47μF
Ceramic
DMIN
DMIN
DMIN
20μF
20μF
40μF
40μF
TABLE 5. CERAMIC CAPACITOR VARIABILITY
CAPACITOR TYPE
TYPICAL VOLTAGE
VARIATION
TEMPERATURE
VARIATION
X7R, 10V
-30% at 10V
-15% at +125°C
X5R, 25V
-50% at 25V
-9% at +85°C
Y5V, 6.3V
-90% at 6.3V
-65% at +85°C
ISL97801
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