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IZ9923 데이터시트 PDF




Integral에서 제조한 전자 부품 IZ9923은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 IZ9923 기능
기능 HIGH-VOLTAGE LED DRIVER
제조업체 Integral
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IZ9923 데이터시트, 핀배열, 회로
IZ9921, IZ9922, IZ9923
HIGH-VOLTAGE LED DRIVER WITH BUILT-IN MOSFET SWITCH
IZ9921, IZ9922, IZ9923 are high-voltage LED driver control ICs with built-in MOSFET switch and
intended for LED lighting control. They allow efficient operation of LED strings from voltage
sources ranging up to 400VDC. The IZ9921/22 includes an internal high-voltage switching
MOSFET controlled with fixed off-time TOFF of approximately 10µs. The LED string is driven at
constant current, thus providing constant light output and enhanced reliability. The output current is
internally fixed at 20mA for IZ9921, 50mA for IZ9922 and 30mA for IZ9923. The peak current con-
trol scheme provides good regulation of the output current throughout the universal AC line voltage
range of 85 to 264VAC or DC input voltage of 20 to 400V.
Main features:
Operating temperature range -40 … +85 ºС;
ON-resistance of the MOSFET switch 210 Ohm;
OFF-state breakdown voltage of the MOSFET switch not less 500 V;
ESD level 500V
Table 1 – Contact pad description
Contact pad
number
Symbol
01 TST Test pad
02 PR3 Test pad
03 PR2 Test pad
04 TR Test pad
05 PR1 Test pad
06 PR4 Test pad
07 UDD Supply voltage pad
08 TU Test pad
09
GND
Ground
10 PU1 Test pad
11 PU2 Test pad
12 PU3 Test pad
13
DRAIN
MOSFET switch drain pad
14
GND
Ground
Description
Note –
1 Contact pad 01 - 06, 08, 10, 11, 12, 14 (test pads) are used for testing process on manufactur-
ing fab only (have not to be bonded by customer).
2 Contact pad 09, 14 (Ground) are electrically connected
Ver.00/19.01.2009
1 IZ9921-TSe+
431104




IZ9923 pdf, 반도체, 판매, 대치품
IZ9921, IZ9922, IZ9923
Functional Description
The IZ9921/22/23 are PWM peak current controllers for controlling a buck converter topology in
continuous conduction mode (CCM). The output current is internally preset at 20mA (IZ9921),
50mA (IZ9922), or 30mA (IZ9923). When the input voltage of 20 to 400V appears at the DRAIN
pin, the internal high-voltage linear regulator seeks to maintain a voltage of 7VDC at the VDD pin.
Until this voltage exceeds the internally programmed under-voltage threshold, the output DRAIN
is non-conductive. When the threshold is exceeded, the DRAIN turns on. The input current be-
gins to flow into the DRAIN pin. Hysteresis is provided in the under-voltage comparator to prevent
oscillation. When the input current exceeds the internal preset level, a current sense comparator
resets an RS flip-flop, and the DRAIN turns off. At the same time, a one-shot circuit is activated
that determines the duration of the off-state (10 µS typ.). As soon as this time is over, the flip-fl op
sets again. The new switching cycle begins. A “blanking” delay of 300nS is provided that prevents
false triggering of the current sense comparator due to the leading edge spike caused by circuit
parasitics.
Typical Application Circuit
VIN Co=0.01μF
LF=2,2μH
AC CF=0.033μF
IN
LED
CIN=0.1μF D
IZ9921/22/23
CDD=0.1μF Vdd
DRAIN
L
GND
Selecting L and D
There is a certain trade-off to be considered between optimal sizing of the output inductor L
and the tolerated output current ripple. The required value of L is inversely proportional to the rip-
ple current dIO in it.
L = TOFF _ MIAX *VO
dI O
(1)
VO is the forward voltage of the LED string. TOFF is the off time of the IZ9921/22/23. The output
current in the LED string (IO) is calculated then as:
IO
=
I TH
1
2
dI
O
(2)
where ITH is the current sense comparator threshold.
The ripple current introduces a peak-to-average error in the output current setting that needs to
be accounted for. Due to the constant off-time control technique used in theIZ9921/22/23, the rip-
ple current is independent of the input AC or DC line voltage variation. Therefore, the output
Ver.00/19.01.2009
4 IZ9921-TSe+
431104

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IZ9923 전자부품, 판매, 대치품
Contact pad layout diagram
1,44±0,03 mm
IZ9921, IZ9922, IZ9923
Technological
mark
Y
(0,0)
X
Die thichness 0,46±0,02 mm.
Technological mark coordinates, um: х=898, у=424.
Table 5 – Technological mark
Type of IC
IZ9921
IZ9922
IZ9923
Technological mark
9921
9922
9923
Ver.00/19.01.2009
7 IZ9921-TSe+
431104

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