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參數(shù)資料
| 型號： | L6382D5 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | POWER MANAGEMENT UNIT FOR MICROCONTROLLED BALLAST |
| 中文描述： | 電源管理單元的微控鎮(zhèn)流器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 206K |
| 代理商： | L6382D5 |
L6382D5
8/14
4
APPLICATION INFORMATION
4.1 POWER MANAGEMENT
The L6382D5 has two stable states (savemode and operatingmode) and two additional states that man-
age the Start-up and fault conditions: the Over Current Protection is a parallel asynchronous process en-
abled when in operatingmode.
Following paragraphs will describe each mode and the condition necessary to shift between them.
Figure 5.
4.1.1 START-UP mode
With reference to the timing diagram of figure 6, when power is first applied to the converter, the voltage
on the bulk capacitor (Vin) builds up and the HV generator is enabled to operate drawing about 10mA.
This current, diminished by the IC consumption (less than 150μA), charges the bypass capacitor connect-
ed between pin Vcc and ground and makes its voltage rise almost linearly.
During this phase, all IC's functions are disabled except for:
■
the current sinking circuit on V
REF
pin that maintains low the voltage by keeping disabled the
microcontroller connected to this pin;
■
the High-Voltage Start-Up (HVSU) that is ON (conductive) to charge the external capacitor on pin Vcc.
As the Vcc voltage reaches the start-up threshold (14V typ.) the chip starts operating and the HV generator
is switched off.
Summarizing:
the high-voltage start-up generator is active;
V
REF
is disabled with additional sinking circuit on pin V
REF
is enabled;
■
TPR is disabled;
OCP is disabled;
the drivers are disabled.
■
■
■
■
4.1.2 SAVE Mode
This mode is entered after the Vcc voltage reaches the turn-on threshold; the VREF is enabled in low cur-
rent source mode to supply the
μ
C connected to it, whose wake-up required current must be less than
10mA: if no switching activity is detected at LGI input, the high voltage start-up generator cycles ON-OFF
keeping the Vcc voltage between VccON and VccSM.
SAVE MODE
OPERATING
MODE
SHUT DOWN
V
CC
>V
CC(ON)
V
CC
<V
REF(OFF)
V
REF
>4.6V
&
T
DE
>10
μ
s
LGI low
for more
than 100
μ
s
START-UP
V
CC
< V
CC(OFF)
or
V
REF
<3.2V
V
CC
<V
CC(ON)
V
CC
<V
REF(OFF)
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| L6382D5TR | POWER MANAGEMENT UNIT FOR MICROCONTROLLED BALLAST |
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