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): 17/24頁
文件大?。?/td> 497K
代理商: IR2156SPBF
IR2156
(S) & (PbF)
www.irf.com
17
5
4
4uA
6
7
CPH
CT
RPH
RT
11
8
COM
LO
M2
R
CS
OSC.
13
HO
M1
12
VS
R
T
R
PH
C
CPH
Half
Bridge
Output
I
LOAD
V
BUS
(+)
V
BUS
(-)
Load
Return
Half-
Bridge
Driver
IR2156
1.3V
S1
S4
Comp 4
10
2
VCC
CS
R1
C
CS
S3
Fault
C
T
oscillate at the preheat frequency with 50% duty
cycle and with a dead-time which is set by the
value of the external timing capacitor, CT, and
internal deadtime resistor, RDT. Pin CPH is
disconnected from COM and an internal 4
μ
A
current source (Figure 3)
Figure 3, Preheat circuitry.
charges the external preheat timing capacitor on
CPH linearly. The over-current protection on pin
CS is disabled during preheat. The preheat
frequency is determined by the parallel
combination of resistors RT and RPH, together
with timing capacitor CT. CT charges and
discharges between 1/3 and 3/5 of VCC (see
Timing Diagram, page 7). CT is charged
exponentially through the parallel combination of
RT and RPH connected internally to VCC through
MOSFET S1. The charge time of CT from 1/3 to
3/5 VCC is the on-time of the respective output
gate driver, HO or LO. Once CT exceeds 3/5 VCC,
MOSFET S1 is turned off, disconnecting RT and
RPH from VCC. CT is then discharged
exponentially through an internal resistor, RDT,
through MOSFET S3 to COM. The discharge time
of CT from 3/5 to 1/3 VCC is the dead-time (both
off) of the output gate drivers, HO and LO. The
selected value of CT together with RDT therefore
program the desired dead-time (see Design
Equations, page 19, Equations 1 and 2). Once
CT discharges below 1/3 VCC, MOSFET S3 is
turned off, disconnecting RDT from COM, and
MOSFET S1 is turned on, connecting RT and
RPH again to VCC. The frequency remains at the
preheat frequency until the voltage on pin CPH
exceeds 13V and the IC enters Ignition Mode.
During the preheat mode, both the over-current
protection and the DC bus under-voltage reset are
enabled when pin CPH exceeds 7.5V.
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 IR2156 enters ignition mode when the voltage
on pin CPH exceeds 13V.
Figure 4, Ignition circuitry.
Pin CPH is connected internally to the gate of a
p-channel MOSFET (S4) (see Figure 4) that
connects pin RPH with pin RT. As pin CPH
5
4
4uA
6
7
CPH
CT
RPH
RT
11
8
COM
LO
M2
RCS
OSC.
13
HO
M1
12
VS
R
T
R
PH
C
CPH
Half
Bridge
Output
I
LOAD
V
BUS
(+)
V
BUS
(-)
Load
Return
Half-
Bridge
Driver
IR2156
S4
C
T
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