参数资料
型号: ISL97651ARTZ-T
厂商: Intersil
文件页数: 15/19页
文件大小: 0K
描述: IC LCD SUPPLY HP 4CHN 36-TQFN
标准包装: 4,000
应用: LCD 电视机/监控器
电流 - 电源: 400µA
电源电压: 4 V ~ 5.5 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: 带卷 (TR)
ISL97651
External Connections
and Components
x2 Mode
x3 Mode
VSUP
VSUP
M2
M4
C1-
C1+
C7
Both
1.2MHz
Control
M1
D3
D2
D1
POUT
C14
0.9V
Error
VSUP
C2+
VREF
M3
C2-
C8
FB
M5
C21
R8
FIGURE 13. V ON FUNCTION DIAGRAM
FBP
C22
R9
Negative Charge Pump Design Consideration
The negative charge pump consists of an internal switcher
determine V OFF output voltage.
V OFF = V FBN ? ? 1 + -------- ? – V REF ? ? -------- ?
M1, M2 which drives external steering diodes D2 and D3 via
a pump capacitor (C12) to generate the negative V OFF
supply. An internal comparator (A1) senses the feedback
R7 R7
? R6 ? ? R6 ?
(EQ. 20)
voltage on FBN and turns on M1 for a period up to half a
CLK period to maintain V (FBN) in regulated operation at
0.2V. External feedback resistor R6 is referenced to V REF .
Faults on V OFF which cause V FBN to rise to more than 0.4V,
are detected by comparator (A2) and cause the fault
detection system to start a fault ramp on C DLY pin which will
cause the chip to power down if present for more than the
time TFD (see "Electrical Specification" on page 2 and also
Figure 15).
The maximum V OFF output voltage of a single stage charge
pump is:
V OFF_MAX ( 2x ) = – V SUP + V DIODE + 2 ? I OUT ? ( r ON ( NOUT ) H + r ON ( NOUT ) L
(EQ. 19)
15
Improving Charge Pump Noise Immunity
Depending on PCB layout and environment, noise pick-up at
the FBP and FBN inputs, which may degrade load regulation
performance, can be reduced by the inclusion of capacitors
across the feedback resistors (e.g. in the “Typical Application
Diagram” on page 10, C21 and C22 for the positive charge
pump). Set R6 ? C20 = R7 ? C19 with C19 ~ 100pF.
FN7493.3
April 24, 2009
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