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參數(shù)資料
| 型號(hào)： | IR21571 |
| 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)： | 14/17頁 |
| 文件大?。?/td> | 234K |
| 代理商： | IR21571 |
IR21571
(S)
14
www.irf.com
Thus, for a lamp removal and replacement, the ballast
automatically restarts the lamp in the proper manner,
maximizing lamp life and minimizing stress on the
power MOSFETs or IGBTs. The SD lead contains an
internal 7.5V zener diode clamp, thereby reducing
the number of external components required.
Half-Bridge Current Sensing and
Protection
The third lead used for protection is the CS lead,
which is normally connected to a resistor in the source
of the lower power MOSFET, as shown in Figure 14.
The CS lead is used to sense fault conditions such
as failure of a lamp to strike, over-current during
normal operation, hard switching, no load, and
operation below resonance. If any one of these
conditions is sensed, the fault latch is set, the oscillator
is disabled, the gate driver outputs go low, and the
chip is put into the micropower mode. The CS lead
performs its sensing functions on a cycle-by-cycle
basis in order to maximize ballast reliability.
For the over-current, failure-to-strike, and hard
switching fault conditions, an externally
programmable, positive-going CS+ threshold is
enabled at the end of the preheat time. The level of
this positive-going threshold is determined by the
value of the resistor ROC. The value of the resistor
ROC is determined by the following formula:
For the under-current and under-resonance
conditions, there is a negative-going CS- threshold
of 0.2V which is enabled at the onset of the run mode.
The sensing of this CS- threshold is synchronized
with the falling edge of the LO output.
Figures 15, 16 and 17 are oscillographs of fault
conditions. Figure 15 shows a failure of the lamp to
strike, Figure 16 shows a hard switching condition
and Figure 17 shows an under-current condition.
Figure 14: Half-bridge current sensing circuit
connection (shaded area)
Figure 15: Lamp failure to strike
rectifie
d
AC line
1
/
2
Bridge
output
C
VCC
R
SUPPLY
D1
D2
Q2
Q1
C
SNUBBER
V
BUS
return
+V
BUS
D
BOOT
C
BOOT
R
CS
R3
R
GLS
R
GHS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
I
VDC
CPH
RPH
RT
RUN
CT
DT
OC
LO
COM
VCC
VB
VS
HO
SD
CS
R
OC
R
OC
= or
50E - 6
V
CS
+
V
CS
+ = 50E -6 - R
OC
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| IR21571PBF | 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 |
| IR21571PBF | 制造商:International Rectifier 功能描述:Controller IC Output Voltage Max.:25V |
| IR21571S | 功能描述:IC BALLAST CONTROL 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 |
| 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 |
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