參數(shù)資料
型號(hào): IR2156SPbF
廠商: International Rectifier
英文描述: BALLAST CONTROL IC
中文描述: 鎮(zhèn)流器控制IC
文件頁數(shù): 16/24頁
文件大?。?/td> 497K
代理商: IR2156SPBF
IR2156
(S) & (PbF)
16
www.irf.com
Functional Description
Under-voltage Lock-Out Mode (UVLO)
The under-voltage lock-out mode (UVLO) is
defined as the state the IC is in when VCC 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 6 of this document. The
IR2156 undervoltage lock-out is designed to
maintain an ultra low supply current of less than
200uA, and to guarantee the IC is fully functional
before the high and low side output drivers are
activated. Figure 1 shows an efficient supply
voltage using the start-up current of the IR2156
together with a charge pump from the ballast
output stage (RSUPPLY, CVCC, DCP1 and DCP2).
14
13
12
11
8
IR2156
LO
COM
VB
VS
HO
Half-Bridge
Output
R
SUPPLY
D
CP1
D
CP2
M2
M1
C
SNUB
V
BUS
(+)
D
BOOT
C
BOOT
R
CS
V
BUS
(-)
2
VCC
C
VCC
Figure 1, Start-up and supply circuitry.
The start-up capacitor (CVCC) is charged by
current through supply resistor (RSUPPLY) minus
the start-up current drawn by the IC. This resistor
is chosen to provide 2X the maximum start-up
current to guarantee ballast start-up at low line
input voltage. Once the capacitor voltage on VCC
reaches the start-up threshold, and the SD pin is
below 4.5 volts, the IC turns on and HO and LO
begin to oscillate. The capacitor begins to
discharge due to the increase in IC operating
current (Figure 2).
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
Figure 2, Supply capacitor (CVCC) voltage.
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 15.6V 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 bootstrap diode (DBOOT)
and supply capacitor (CBOOT) comprise 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.
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 IR2156 enters
preheat mode when VCC exceeds the UVLO
positive-going threshold. HO and LO begin to
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