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參數(shù)資料
| 型號(hào)： | IR21571S |
| 廠商： | International Rectifier |
| 英文描述： | FULLY INTEGRATED BALLAST CONTROL IC |
| 中文描述： | 完全集成的鎮(zhèn)流器控制IC |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 234K |
| 代理商： | IR21571S |
IR21571
(S)
12
www.irf.com
Lamp Protection & Automatic Restart Circuitry Operation
Three leads on the IR21571 are used for protection, as shown in Figure 10 below. These are V
DC
(dc bus
monitor), S
D
(unlatched shutdown), C
S
(latched shutdown) and OC (CS+ threshold programming).
Figure 10: Lamp protection & automatic restart circuitry block diagram with external component connection.
Sensing the DC Bus Voltage
The first of these protection leads senses the voltage
on the DC bus by means of an external resistor
divider and an internal comparator with hysteresis.
When power is first supplied to the IC at system
startup, 3 conditions are required before oscillation
is initiated: 1.) the voltage on the V
CC
lead must exceed
the rising undervoltage lockout threshold (11.5V),
2.) the voltage at the V
DC
lead must exceed 5.1V, and
3.) the voltage on the SD lead must be below
approximately 1.85V. If a low dc bus condition occurs
during normal operation, or if power to the ballast is
shut off, the dc bus will collapse prior to the V
CC
of the
chip (assuming the V
CC
is derived from a charge
pump off of the output of the half-bridge). In this
case, the voltage on the V
DC
lead will shut the oscillator
off, thereby protecting the power transistors from
potentially hazardous hard switching. Approximately
2V of hysteresis has been designed into the internal
comparator sensing the V
DC
lead, in order to account
for variations in the dc bus voltage under varying
load conditions. When the dc bus recovers, the chip
restarts from the beginning of the control sequence,
as shown in timing diagram Figure 11.
OVER-
TEMP
DETECT
2
4.0V
5.1V
7.6V
3.0V
5.1V
1
1.0uA
7
CPH
DT
VDC
Q
T
R
Q
8
OC
2.0V
10
0.2V
CS
Q
S
R
Q
Q
D
R
Q
CLK
Q
S
R
Q
UNDER-
VOLTAGE
DETECT
from oscillator
section
+V
BUS
from lower
lamp cathode
R
CS
R3
R4
R5
R1
C1
R2
Q2
9
SD
50uA
7.6V
7.6V
7.6V
R
OC
C2
V
CC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR21571SPBF | 功能描述:功率驅(qū)動(dòng)器IC BALLAST CTRL BELO 600V 15.6V VCC 150uA RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IR21571STR | 功能描述:IC BALLAST CONTROL INTEG 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| IR21571STRPBF | 功能描述:功率驅(qū)動(dòng)器IC Ballast Cntrl Thrml Ovrload Prot RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IR2157S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Ballast Control. Below Resonance Protection. Thermal Overload Protection. Protection from Failure to Strike. Programmable Preheat Time and Run Frequency. Programmable Deadtime in a 16-lead SOIC Narrow package |
| IR2159 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:DIMMING BALLAST CONTROL IC |
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