參數(shù)資料
型號(hào)： UCC3977TRPW
廠(chǎng)商： Texas Instruments, Inc.
英文描述： BALLAST/BACKLIGHT CONTROLLER/DRIVER|TSSOP|8PIN|PLASTIC
中文描述： 鎮(zhèn)流器/背光控制器/驅(qū)動(dòng)器| TSSOP封裝| 8引腳|塑料
文件頁(yè)數(shù)： 8/28頁(yè)
文件大小： 433K
代理商： UCC3977TRPW
SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
8
www.ti.com
state diagram
A logic state diagram for the UCC397x family of controllers is shown in Figure 5. During power-up the controller
transitions from UVLO to the momentary startup state. During startup, the COMP pin is preconditioned at
maximum frequency and the OPEN/SD capacitor is discharged before beginning normal operation. In the
normal operating state, the frequency is swept from high to low allowing the lamp to be struck and the current
in the lamp to be regulated.
STARTUP *
OPEN/SD = 0V
COMP = 0V
OSC, OUT active
NORMAL OPERATION
OPEN/SD < 1.5V
COMP < 2.5V
OSC, OUT active
OPEN LAMP *
1.5V < OPEN/SD <2.5V
COMP < 2.5V
OSC, OUT active
NO
–
LOCK *
COMP > 2.5V
OPEN/SD < 1.5V
OSC, OUT active
COUNT=7
ERROR
SHUTDOWN
OSC active
OUT off state
UVLO
VDD < 3.0V
OSC inactive
OUT off state
COUNT=0
SHUTDOWN
OPEN/SD > 2.5V
COUNT =0
OSC inactive
OUT off state
Low current VDD,
OPEN/SD
VDD>3.0V
OPEN/SD
< 0.5V
NO
YES
Increment COUNT
OUT off state
UCC3975: OUT1 low, OUT2 low
UCC3976: OUTP high, OUTN high
UCC3977: OUT1 low, OUT2 low
*
Momentary states
UDG
–
01102
Figure 5. State Diagram
The normal operating state can be exited in one of four ways:
bringing V
DD
< 3 V
a user commanded shutdown (OPEN/SD > 2.5 V)
an open lamp condition (OPEN/SD > 1.5 V), or
if the device fails to achieve regulation before reaching minimum frequency (EAO > 2.5 V).
The latter two conditions cause an internal retry counter to increment before attempting another startup. If the
application does not operate normally after seven retrys, the controller enters an error induced shutdown state
removing power to the load. The error state and counter can be cleared by removing V
DD
to the part or by a
user commanded shutdown.
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