参数资料
| 型号： | EL7642AILTZ |
| 厂商： | Intersil |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC/DC TFT-LCD 32-QFN |
| 标准包装： | 72 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 7 |
| 输出电压： | 5.5 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 散装 |
EL7640A, EL7641A, EL7642A
V CDEL
IN
V REF
V BOOST
t ON
t DEL1
V OFF
t DEL2
V ON
V ON SLICE CIRCUIT
t DEL3
NOTE: Not to scale
START-UP SEQUENCE
TIMED BY C DEL
NORMAL
OPERATION
FAULT
PRESENT
FIGURE 23. START-UP SEQUENCE
Component Selection for Start-up Sequencing and
Fault Protection
The C REF capacitor is typically set at 220nF and is required
to stabilize the V REF output. The range of C REF is from
22nF to 1μF and should not be more than five times the
capacitor on C DEL to ensure correct start-up operation.
The C DEL capacitor is typically 100nF and has a usable
range from 22nF minimum to several microfarads – only
limited by the leakage in the capacitor reaching μA levels.
16
C DEL should be at least 1/5 of the value of C REF (see
above). Note that with 100nF on C DEL the fault time-out will
be typically 23ms and the use of a larger/smaller value will
vary this time proportionally (e.g. 1μF will give a fault time-
out period of typically 230ms).
Fault Sequencing
The EL7640A, EL7641A and EL7642A have an advanced
fault detection system which protects the IC from both
adjacent pin shorts during operation and shorts on the output
FN6270.0
May 15, 2006
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