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參數(shù)資料
| 型號(hào)： | IRS2166DPBF |
| 廠商： | International Rectifier |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | PFC + BALLAST CONTROL IC |
| 中文描述： | PFC的鎮(zhèn)流器控制IC |
| 文件頁(yè)數(shù)： | 9/17頁(yè) |
| 文件大?。?/td> | 454K |
| 代理商： | IRS2166DPBF |
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IRS2166D(S)PbF
www.irf.com
Page 9
I. Ballast Section
Functional Description
Undervoltage Lock-Out Mode (UVLO)
The undervoltage lock-out mode (UVLO) is defined as the
state the IC is in when V
CC
is below the turn-on threshold
of the IC. To identify the different modes of the IC, refer to
the State Diagram shown on page 7 of this document. The
IRS2166D undervoltage lock-out is designed to maintain
an ultra low supply current of 250 μA (I
), and to
guarantee the IC is fully functional before the high and low
side output drivers are activated. Fig. 1 shows an efficient
supply voltage using the start-up current of the IRS2166D
together with a charge pump from the ballast output stage
(R
SUPPLY
, C
VCC
, D
CP1
, and D
CP2
).
I
LO
COM
VB
VS
HO
V
BUS
(+)
V
BUS
(-)
VCC
D
BOOT
C
BOOT
16
15
14
13
12
11
M2
M1
C
VCC
R
SUPPLY
D
CP1
D
CP2
Half-Bridge
Output
R
CS
C
SNUB
Fig. 1:
Start-up and supply circuitry
The start-up capacitor (C
VCC
) is charged by current
through supply resistor (R
SUPPLY
) minus the start-up current
drawn by the IC. This resistor is chosen to set the line
input voltage turn-on threshold for the ballast. Once the
capacitor voltage on V
CC
reaches the start-up threshold
V
+, and the SD pin is below 3.0 V (V
), the IC turns
on and HO and LO begin to oscillate. The capacitor
begins to discharge due to the increase in IC operating
current (Fig. 2).
During the discharge cycle, the rectified current from the
charge pump charges the capacitor above the IC turn-off
threshold. The charge pump and the internal 15.6 V
(V
CLAMP
) zener clamp of the IC take over as the supply
voltage. The start-up capacitor and snubber capacitor
must be selected such that enough supply current is
available over all ballast operating conditions. A supply
capacitor (C
) comprises the supply voltage for the high
side driver circuitry. To guarantee that the high-side
supply is charged up before the first pulse on pin HO, the
first pulse from the output drivers comes from the LO pin.
During undervoltage lock-out mode, the high- and low-side
driver outputs HO and LO are both low, pin CT is
connected internally to COM to disable the oscillator, and
pin CPH is connected internally to COM for resetting the
preheat time.
DISCHARGE
TIME
INTERNAL VCC
ZENER CLAMP VOLTAGE
VHYST
V
UVLO+
V
UVLO-
CHARGE PUMP
OUTPUT
t
V
C1
R
& C
VCC
TIME
CONSTANT
C
DISCHARGE
Fig. 2:
Supply capacitor (C
VCC
) voltage
Preheat Mode (PH)
The preheat mode is defined as the state the IC is in
when the lamp filaments are being heated to their correct
emission temperature. This is necessary for maximizing
lamp life and reducing the required ignition voltage. The
IRS2166D enters preheat mode when V
CC
exceeds the
UVLO positive-going threshold V
. HO and LO begin
to oscillate at the preheat frequency with 50% duty cycle
and with a deadtime which is set by the value of the
external timing capacitor, C
, and internal deadtime
resistor, R
DT
. Pin CPH is disconnected from COM and an
internal 3.6 μA (I
CPH
) current source (Fig. 3) charges the
external preheat timing capacitor on CPH linearly. The
over-current protection on pin CS is enabled during
preheat. The preheat frequency is determined by the
parallel combination of resistors R
T
and R
PH
, together
with timing capacitor C
T
. C
T
charges and discharges
between 1/3 (V
CT-
) and 3/5 (V
CT+
) of V
CC
(see Timing
Diagram, page 9). C
T
is charged exponentially through
the parallel combination of R
T
and R
PH
connected
internally to V
CC
through MOSFET S1. The charge time
of CT from 1/3 to 3/5 V
CC
is the on-time of the respective
output gate driver, HO or LO. Once C
T
exceeds 3/5 V
CC
,
MOSFET S1 is turned off, disconnecting R
T
and R
PH
from
V
CC
. C
T
is then discharged exponentially through an
internal resistor, R
DT
, through MOSFET S3 to COM. The
discharge time of C
T
from 3/5 to 1/3 V
CC
is the deadtime
(both off) of the output gate drivers, HO and LO. The
selected value of C
T
and R
DT
program the desired
deadtime (see Design Equations, page 15, Equations 1
and 2). Once C
T
discharges below 1/3 V
CC
, MOSFET S3
is turned off, disconnecting R
DT
from COM, and MOSFET
S1 is turned on, connecting R
T
and R
PH
again to V
CC
. The
frequency remains at the preheat frequency until the
voltage on pin C
PH
exceeds 10 V and the IC enters
ignition mode. During the preheat mode, both the over-
current protection and the DC bus undervoltage reset are
enabled when pin C
PH
exceeds 12 V (V
CPHRUN
).
Ignition Mode (IGN)
The ignition mode is defined as the state the IC is in
when a high voltage is being established across the lamp
necessary for igniting the lamp. The IRS2166D enters
ignition mode when the voltage on pin CPH exceeds
10.8 V (V
CPHEOP
). Pin CPH is connected internally to the
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IRS2166DSPBF | PFC + BALLAST CONTROL IC |
| IRS2166DSTRPBF | PFC + BALLAST CONTROL IC |
| IRS2168DPBF | ADVANCED PFC + BALLAST CONTROL IC |
| IRS2168DSPBF | ADVANCED PFC + BALLAST CONTROL IC |
| IRS2168DSTRPBF | ADVANCED PFC + BALLAST CONTROL IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRS2166DPBF | 制造商:International Rectifier 功能描述:MOSFET Driver IC |
| IRS2166DSPBF | 功能描述:功率驅(qū)動(dòng)器IC PFC BALLAST CTRL IC 600V 15.6V VCC ESD 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 |
| IRS2166DSPBF | 制造商:International Rectifier 功能描述:MOSFET Driver IC |
| IRS2166DSTRPBF | 功能描述:功率驅(qū)動(dòng)器IC PFC & Ballast Cntrl IC 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 |
| IRS21681DSPBF | 制造商:International Rectifier 功能描述:ADVANCED PFC AND BALLAST CONTROL IC - Rail/Tube 制造商:International Rectifier 功能描述:IC LIGHT BALLAST CONTROL |
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