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參數(shù)資料
| 型號： | STOD2540 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | PMOLED display power supply |
| 中文描述： | PMOLED顯示器電源 |
| 文件頁數(shù)： | 8/19頁 |
| 文件大?。?/td> | 504K |
| 代理商： | STOD2540 |
Functional description
STOD2540
8/19
5
Functional description
5.1
Boost controller
STOD2540 is a boost converter operating in PFM (pulsed frequency modulation) mode. The
converter monitors the output voltage through the bridge resistor divider R
1
and R
2
and
when the feedback voltage falls below the reference voltage, REF2, the boost switch t
SW
turns ON and the current ramps up. The inductor current is measured by detect the
temperature compensated drain voltage of the boost MOSFET. The boost turns off when its
drain voltage reaches the reference REF1, the main switch remains off until the minimum off
time (300ns typical) has passed and the feedback voltage is below the reference again. A
maximum ON time of 4μs prevent the switch t
SW
to stay ON during a too long period of time.
In order to well calculate the bridge resistors values with a fixed V
O
, the following formula
can be used:
5.2
Adjustable peak inductor current limit
The peak inductor current is monitored by sensing the drain voltage of the switch t
SW
.
Since it exceeds the temperature compensated and supply voltage compensated reference
REF1, the RS Flip flop is reset and t
SW
is turned OFF.
By connecting a resistance between the pin RSET and GND, the peak current limit can be
adjusted from 200mA to 1.1A (R
SET
from 10k
to 100k
). When the pin R
SET
is directly
connected to V
I
, the default value is 1A.
5.3
Enable
The ENABLE pin is a high logic input signal and allows turning on/off the controller without
cutting the input voltage from the boost regulator circuit. With a high input voltage (1.2V
<V
EN
< V
I
+0.3V) on this pin, the device is allowed to work normally. No pull-up or pull down
is present on this pin.
5.4
OVP
If the regulation loop is cut, there is no signal at the feedback pin, the PFM controller will
then continue to switch without control and generate an output voltage at the SW, V
CAP
and
V
O
pin exceeding the breakdown value V
BSW
, V
BCAP
and V
BO
.
The Over Voltage Protection (OVP) senses the voltage at the V
CAP
pin.When the voltage
exceed the breakdown voltage of the device the controller is automatically turned Off.
A hysteresis control enables the device to automatically restart when the output voltage
drops below a 2V typical value.
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| STOD32WJR | 功能描述:- Converter, AMOLED Display Voltage Regulator IC 3 Output 12-FlipChip 制造商:stmicroelectronics 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 應(yīng)用:轉(zhuǎn)換器，AMOLED 顯示器 電壓 - 輸入:2.9 V ~ 4.5 V 輸出數(shù):3 電壓 - 輸出:多重 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:12-UFBGA，F(xiàn)CBGA 供應(yīng)商器件封裝:12-覆晶 標(biāo)準(zhǔn)包裝:1 |
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