- 您现在的位置：买卖IC网 > PDF目录16796 > ISL97650ARTZ-TK (Intersil)IC LCD SUPPLY HP 4CHAN 36-TQFN PDF资料下载
参数资料
| 型号： | ISL97650ARTZ-TK |
| 厂商： | Intersil |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY HP 4CHAN 36-TQFN |
| 标准包装： | 1 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 250µA |
| 电源电压： | 4 V ~ 14 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 标准包装 |
| 产品目录页面： | 1249 (CN2011-ZH PDF) |
| 其它名称： | ISL97650ARTZ-TKDKR |
ISL97650
Rectifier Diode (Buck Converter)
A Schottky diode is recommended due to fast recovery and
low forward voltage. The reverse voltage rating should be
higher than the maximum input voltage. The peak current
rating is 2A, and the average current should be as shown in
Equation 15:
minimum load can be adjusted by the feedback resistors
to FBL.
The bootstrap capacitor can only be charged when the
higher side MOSFET is off. If the load is too light which can
not make the on time of the low side diode be sufficient to
replenish the boot strap capacitor, the MOSFET can’t turn
I avg = ( 1 – D ) *I o
(EQ. 15)
on. Hence there is minimum load requirement to charge the
bootstrap capacitor properly.
Where I o is the output current of buck converter. Table 8
shows some recommended diodes.
TABLE 8. BUCK RECTIFIER DIODE RECOMMENDATION
Charge Pump Controllers (V ON and V OFF )
The ISL97650 includes 2 independent charge pumps (see
charge pump block and connection diagram, Figure 17). The
DIODE
PMEG2020EJ
SS22
V R /I AVG
RATING
20V/2A
20V/2A
PACKAGE
SOD323F
SMB
VENDOR
Philips
Semiconductors
Fairchild
Semiconductor
negative charge pump inverts the V SUP voltage and
provides a regulated negative output voltage. The positive
charge pump doubles or triples the V SUP voltage and
provides a regulated positive output voltage. The regulation
of both the negative and positive charge pumps is generated
by internal comparator that senses the output voltage and
compares it with the internal reference.
Output Capacitor (Buck Converter)
Four 10μF or two 22μF ceramic capacitors are recommended
for this part. The overshoot and undershoot will be reduced
with more capacitance, but the recovery time will be longer.
TABLE 9. BUCK OUTPUT CAPACITOR RECOMMENDATION
The pumps use pulse width modulation to adjust the pump
period, depending on the load present. The pumps can
provide 30mA for V OFF and 20mA for V ON .
Positive Charge Pump Design Consideration
The positive charge pump integrates all the diodes (D1, D2
CAPACITOR
10μF/6.3V
10μF/6.3V
22μF/6.3V
100μF/6.3V
SIZE
0805
0805
1210
1206
VENDOR
TDK
Murata
TDK
Murata
PART NUMBER
C2012X5R0J106M
GRM21BR60J106K
C3216X5R0J226M
GRM31CR60J107M
and D3 shown in the “Block Diagram” on page 9) required
for x2 (V SUP doubler) and x3 (V SUP Tripler) modes of
operation. During the chip start-up sequence, the mode of
operation is automatically detected when the charge pump is
enabled. With both C7 and C8 present, the x3 mode of
operation is detected. With C7 present, C8 open and with
C1+ shorted to C2+, the x2 mode of operation will be
detected.
2 ? V SUP – 2 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
( 2 ? ( 2 ? r ONH + r ONL ) )
PI Loop Compensation (Buck Converter)
The buck converter of ISL97650 can be compensated by a
RC network connected from CM2 pin to ground. C9 = 4.7nF
and R2 = 2k RC network is used in the demo board. The
larger value resistor can lower the transient overshoot,
however, at the expense of stability of the loop.
The stability can be optimized in a similar manner to that
Bootstrap Capacitor (C16)
This capacitor is used to provide the supply to the high driver
circuitry for the buck MOSFET. The bootstrap supply is
formed by an internal diode and capacitor combination. A
1μF is recommended for ISL97650. A low value capacitor
Due to the internal switches to V SUP (M1, M2 and M3),
P OUT is independent of the voltage on V SUP until the charge
pump is enabled. This is important for TFT applications
where the negative charge pump output voltage (V OFF ) and
A VDD supplies need to be established before P OUT .
The maximum P OUT charge pump current can be estimated
from the following equations assuming a 50% switching
duty:
I MAX ( 2x ) ～ min of 50mA or
---------------------------------------------------------------------------------------------------------------------- ? 0.95A
I MAX ( 3x ) ～ min of 50mA or
3 ? V SUP – 3 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
( 2 ? ( 3 ? r ONH + 2 ? r ONL ) )
can lead to overcharging and in turn damage the part.
If the load is too light, the on-time of the low side diode may
be insufficient to replenish the bootstrap capacitor voltage. In
---------------------------------------------------------------------------------------------------------------------- ? 0.95V
(EQ. 16)
this case, if V IN -V BUCK < 1.5V, the internal MOSFET pull-up
device may be unable to turn-on until V LOGIC falls. Hence,
there is a minimum load requirement in this case. The
14
Note: V DIODE (2 ? I MAX ) is the on-chip diode voltage as a
function of I MAX and V DIODE (40mA) < 0.7V.
FN9198.4
April 17, 2009
相关PDF资料 |
PDF描述 |
|---|---|
| 160PX10MEFC8X11.5 | CAP ALUM 10UF 160V 20% RADIAL |
| 222K152-12-0 | BOOT MOLDED |
| 202D153-12-60-0 | BOOT MOLDED |
| ECE-V1HAR33SR | CAP ALUM 0.33UF 50V 20% SMD |
| RSC07DRTF | CONN EDGECARD 14POS DIP .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97650BIRTZ-T | 功能描述:直流/直流开关调节器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97650BIRTZ-TK | 功能描述:直流/直流开关调节器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97651ARTZ | 制造商:Intersil Corporation 功能描述: |
| ISL97651ARTZ-T | 功能描述:显示驱动器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| ISL97651ARTZ-TK | 功能描述:显示驱动器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY 1K RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。