参数资料
| 型号： | ISL97653AIRZ |
| 厂商： | Intersil |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY 5CHN 40-QFN |
| 标准包装： | 50 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 4mA |
| 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： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN 裸露焊盘（6x6） |
| 包装： | 管件 |
ISL97653A
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
Positive Charge Pump Design Consideration
All positive charge pump diodes (D1, D2 and D3 shown in
are included in the ISL97653A. During the chip start-up
sequence the mode of operation is automatically detected
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
when the charge pump is enabled. With both C 7 and C 8
present, the x3 mode of operation is detected. With C 7
present, C 8 open and with C 1 + shorted to C 2 +, the x2 mode
of operation will be detected.
Internal switches M1, M2 and M3 isolate P OUT from SUPP
until the charge pump is enabled. This is important for TFT
2 ? V SUPP – 2 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
( 2 ? ( 2 ? R ONH + R ONL ) )
PI Loop Compensation (Buck Converter)
The buck converter of ISL97653A can be compensated by a
RC network connected from CM2 pin to ground. C 8 = 4.7nF
and R 20 = 10k RC network is used in the demo board. A
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 (C 13 )
applications that require the negative charge pump output
(V OFF ) and A VDD supplies to be established prior to 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 40mA or
-------------------------------------------------------------------------------------------------------------------------- ? 0.95A
I MAX ( 3x ) ～ min of 40mA or
– 3 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
-------------------------------------------------------------------------------------------------------------------------- ? 0.95V
This capacitor provides 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
3 ? V ·
SUP P
( 2 ? ( 3 ? R ONH + 2 ? R ONL ) )
(EQ. 14)
recommended for ISL97653A. A low value capacitor can
lead to overcharging and in turn damage the part.
During very light loads, the on-time of the low side diode
may be insufficient to replenish the bootstrap capacitor
voltage. Additionally, 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 minimum load can be adjusted by the
feedback resistors to FBL.
Charge Pump Controllers (V ON and V OFF )
The ISL97653A includes 2 independent charge pumps (see
charge pump block and connection diagram). The negative
charge pump inverts the SUPN voltage and provides a
regulated negative output voltage. The positive charge pump
doubles or triples the SUPP voltage and provides a
regulated positive output voltage. The regulation of both the
negative and positive charge pumps is controlled by internal
comparators that sense the output voltage. These sensed
voltages are then compared to scaled internal reference
voltages.
Charge pumps use pulse width modulation to adjust the
pump period, depending on the load present. The pumps
can provide 100mA for V OFF and 40mA for V ON .
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.
FN6367.3
September 7, 2010
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| ISL97653AIRZ-T | 功能描述:电流型 PWM 控制器 5-CH INTEGRTD LCD SUPPLY W/TEMP SENSOR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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| ISL97653IRZ | 制造商:Intersil Corporation 功能描述: |
| ISL97656IRTZ | 功能描述:IC REG BOOST ADJ 4A 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
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