参数资料
型号: IRPLHID2
厂商: International Rectifier
文件页数: 9/30页
文件大小: 0K
描述: KIT DESIGN BALLAST IRS2573D
标准包装: 1
系列: *
主要目的: 照明,镇流器控制
嵌入式:
已用 IC / 零件: *
主要属性: *
次要属性: *
已供物品:
the buck high-side and full-bridge high and low-side output drivers are activated. The low
voltage power supply is realized with buck converter circuit utilizing the Link Switch
LNK302D (Figure 4.1). Once the voltage on VCC reaches the start-up threshold
(UVLO+), voltage on VSENSE pin is above VOV threshold and the voltage on RST pin is
less than 1.5V, the IC turns on and the full-bridge oscillator (CT) and gate driver outputs
(HO1, LO1, HO2 and LO2) begin to oscillate. During UVLO mode, the full-bridge and
buck are off, the ignition timer and clock are off, the fault and good counters are reset,
and the fault latch is reset.
5.3 Ignition Mode
The ignition timer is enabled when the IC first enters IGN Mode. The ignition timer
frequency is programmed with the external capacitor at the TIGN pin. CTIGN charges up
and down linearly through internal sink and source currents between a fixed voltage
window of 2V and 4V (Figure 5.3). This sets up an internal clock (666ms typical) that is
divided out 128 times and then used to turn the ignition gate driver output (IGN pin) on
and off for a given on and off-time (21sec ‘high’/64sec ‘low’ typical). A logic ‘high’ at the
IGN pin will turn the external ignition MOSFET (MIGN) on and enable the external sidac-
controlled pulse ignition circuit.
666ms
typ.
4V
TIGN
2V
IGN
VLAMP
0V
IGN ENABLED
(21 s typ.)
IGN DISABLED
(64 s typ.)
IGN ENABLED
(21 s typ.)
FAULT
MODE
1180sec typ.
787sec typ.
Figure 5.3: Ignition Timer Timing Diagram
During the ignition phase, the lamp is an open circuit and the buck output voltage is
limited to a maximum value. The ignition circuit comprises of a diac (DIGN), transformer
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