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參數(shù)資料
| 型號： | ISL97522 |
| 廠商： | Intersil Corporation |
| 英文描述： | 4-Channel TFT-LCD Supply |
| 中文描述： | 4通道的TFT - LCD電源 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 418K |
| 代理商： | ISL97522 |
10
FN7445.0
December 13, 2006
Applications Information
The ISL97522 provides a multiple output power supply
solution for TFT-LCD applications. The system consists of a
high efficiency boost controller, two low cost linear-regulator
controllers (V
ON
and V
OFF
) and a buck reglator (V
LOGIC
).
Table 1 below lists the recommended components.
A
VDD
Converter
The main boost converter is a current mode PWM controller
operating at a fixed frequency. The 1MHz switching
frequency enables the use of low profile inductor and
multilayer ceramic capacitors, which results in a compact,
low-cost power system for LCD panel design.
The A
VDD
converter can operate in continuous or
discontinuous inductor current mode. The ISL97522 is
designed for continuous current mode, but it can also
operate in discontinuous current mode at light load. In
continuous current mode, current flows continuously in the
inductor during the entire switching cycle in steady state
operation. The voltage conversion ratio in continuous current
mode is given by (in boost mode):
A
IN
where D is the duty cycle of switching MOSFET.
Figure 15 shows the function diagram of the boost controller.
It uses a summing amplifier architecture consisting of GM
stages for voltage feedback, current feedback and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is reached.
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. Current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
and the potential for noise being coupled into the feedback
pin. A resistor network in the order of 200k
Ω
is
recommended. The boost converter output voltage is
determined by the following equation:
TABLE 1. RECOMMENDED COMPONENTS
DESIGNATION
DESCRIPTION
C1, C2, C3
10μF, 16V, X7R ceramic capacitor (1206)
TDK C3216X7R1C106M
C20
4.7μF, 16V X5R ceramic capacitor (1206)
TDK C3216X5R1A475K
C15
1μF, 25V X7R ceramic capacitor (1206)
TDK C3216X7R1E105K
D1
1A 20V low leakage schottky rectifier (CASE
457-04) ON SEMI MBRM120ET3
D11, D12, D21
200mA 30V schottky barrier diode (SOT-23)
Fairchild BAT54S
L1
6.8mH 4.6A inductor
Coilcraft DO3316P-682ML
Q1,Q2
6.3A 30V single N-Channel logic level
PowerTrench MOSFET (SOT-23)
Fairchild FDC655AN
Q3
-2A -30V single P-Channel logic level
PowerTrench MOSFET (SuperSOT-3)
Fairchild FDN360P
Q11
200mA 40V PNP amplifier (SOT-23)
Fairchild MMBT3906
Q21
200mA 40V NPN amplifier (SOT-23)
Fairchild MMBT3904
---------------
D
-----–
=
(EQ. 1)
A
VDD
R
--------------------
R
2
+
1
V
FBB
×
=
(EQ. 2)
ISL97522
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