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参数资料
| 型号： | ISL97801ARZ |
| 厂商： | Intersil |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER AUTOMOTIVE 20-QFN |
| 标准包装： | 75 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 频率： | 850kHz ~ 1.15MHz |
| 电源电压： | 2.7 V ~ 16 V |
| 输出电压： | 32V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 105°C |
ISL97801
Rectifier Diode
In buck mode:
V RIPPLE = ----------------------------------------------- × ? --------------------------- + ESR ?
2 × f s × L
? f × C ?
V OUT
A high speed rectifier diode is necessary to prevent
excessive voltage overshoot, especially in the boost
configuration. Low forward voltage and reverse leakage
current will minimize losses, making Schottky diodes the
preferred choice. Similarly to the inductor, a diode with a
suitable current rating to handle current limit in the
configuration must be used.
where:
D = ----------------
V IN
( V IN – V OUT ) × D D
s OUT
(EQ. 7)
(EQ. 8)
Output Capacitor
The output capacitor acts to smooth the output voltage and
in the boost configuaration supplies load current directly
during the conduction phase of the power switch. Ripple
voltage consists of two components, the first due to charging
and discharging of the capacitor; the second due to IR drop
across the ESR of the capacitor by inductor ripple current.
For a low ESR ceramic capacitor, output ripple is dominated
by the charging and discharging of the output capacitor.
Care should be taken to ensure the voltage rating of the
capacitor exceeds the maximum output voltage.
Compensation
The ISL97801 employs a direct summing control loop with
current feedback. No error amplifier is used in the system.
V RIPPLE = ---------------- × ------- + I LPK × ESR
V OUT – V IN
I LPK = ------------- + ------------------------------------ × ------------------
f s
In boost mode:
I O D
C OUT F S
where:
D = --------------------------------
V OUT
and
I O ( V OUT – V IN ) ( 1 – D )
1 – D 2 × L
(EQ. 4)
(EQ. 5)
(EQ. 6)
The arrangement provides fast transient response and
makes use of the output capacitor to compensate the loop.
The effect of the pole associated with the inductor is
minimized by the current feedback. The number of LEDs,
their DC bias current and the value of feedback resistor alter
loop stability due to their effect on feedback factor which is
heavily influenced by the small signal impedance of the
LEDs. Generally, higher numbers of LEDs, lower bias levels
and smaller values of feedback resistor will require smaller
output capacitors to achieve loop stability. A combination of
low ESR electrolytic and ceramic capacitors may be used to
reduce implementation costs.
TABLE 2. BOOST MODE COMPENSATION. 2.7V OPERATION
VOUT (V)
7
10.5
14
17.5
21
24.5
28
VFB
I OUT
LED’s
2
3
4
5
6
7
8
50mV
50mA
Electrolytic
Ceramic
94μF
40μF
47μF
20μF
40μF
20μF
20μF
DMAX
DMAX
100mV
100mA
Electrolytic
94μF
Ceramic
60μF
60μF
40μF
40μF
40μF
200mV
350mA
Electrolytic
94μF
47μF
47μF
47μF
ILIM
ILIM
ILIM
Ceramic
60μF
40μF
40μF
40μF
200mV
1A
Electrolytic
ILIM
ILIM
ILIM
ILIM
ILIM
ILIM
ILIM
Ceramic
TABLE 3. BOOST MODE COMPENSATION 6V OPERATION
VOUT (V)
7
10.5
14
17.5
21
24.5
28
VFB
I OUT
LED’s
2
3
4
5
6
7
8
50mV
50mA
Electrolytic
94μF
47μF
Ceramic
40μF
20μF
40μF
20μF
20μF
20μF
20μF
100mV
100mA
Electrolytic
141μF
47μF
200mV
350mA
Ceramic
Electrolytic
Ceramic
60μF
141μF
60μF
60μF
47μF
60μF
60μF
47μF
40μF
40μF
60μF
40μF
40μF
40μF
40μF
40μF
40μF
200mV
1A
Electrolytic
94μF
47μF
ILIM
ILIM
ILIM
ILIM
ILIM
14
Ceramic
40μF
40μF
FN6428.1
April 2, 2007
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