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HY7700 데이터시트 PDF




Oristreak에서 제조한 전자 부품 HY7700은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 HY7700 기능
기능 High Brightness LED Driver
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HY7700 데이터시트, 핀배열, 회로
Description
HY7700 is a PWM high-efficiency LED
driver controller IC. It allows efficient
operation of High Brightness HBLED(s)
from voltage sources ranging from 9VDC up
to 450VDC. HY7700 controls an external
MOSFET at variable switching frequency up
to 300 kHz. The constant off-time can be
programmed using a single resistor. The LED
string is driven at constant current rather than
constant voltage, thus providing constant
light output and enhanced reliability. The
output current can be programmed between
a few milliamps and up to more than 1.0A
.
Typical Applications Circuit
HY7700
High Brightness LED Driver
Features
n >90% efficiency.
n 9V to 450V input Range.
n Constant Current LED driver.
n More than 1.0A output applications.
n PWM Low-Frequency Dimming via
Enable pin.
n Input Voltage Surge ratings up to 450V.
Applications
n DC/DC LED Driver Application.
n RGB backlighting LED driver.
n Back lighting of flat panel displays.
n LED Lighting Application
n Automotive LED Lighting Application.
Copyright © 2009 Oristreak Ltd.,
HTTP://WWW.ORISTREAK.COM
-1-
HY7700 V1.0




HY7700 pdf, 반도체, 판매, 대치품
ELECTRICAL CHARACTERISTICS
(TA = 25°C, UNLESS OTHERWISE SPECIFIED)
HY7700
High Brightness LED Driver
PARAMETER
SYMBOL
CONDITION
MIN TYP MAX UNIT
Input DC supply
voltage range
VINDC
DC input voltage
9 450 V
Shut-Down mode
supply current
VDP Pin EN to GND,VIN=9V
0.5 1.0 mA
Internally regulated
voltage
VDD
VIN = 9 450V, IDD = 0, Pin DRV open
7.0
7.5
8.0
V
Maximal pin VDD voltage
VDDmax When an external voltage applied to pin
VDD
13.5 V
VDD current available for
external circuit
IDD(ext) VIN = 9 450V
1.0 mA
VDD under-voltage lockout
threshold
UVLO VIN rising
6.45 6.7 6.95
V
VDD under voltage lockout
hysteresis
ΔUVLO VIN falling
500 mV
Pin EN input low voltage
VEN(lo) VIN = 9 - 450V
1.0 V
Pin EN input high voltage
VEN(hi) VIN = 9 - 450V
2.4 V
Pin EN pull-down resistance
Current sense pull-in
threshold voltage
DRV high output voltage
RLN
VEN =5 V
VCS(hi) @ TA =-40°C to +85°C
VDRV(hi) IOUT = -10 mA
DRV low output voltage
Oscillator Frequency
Linear Dimming pin
voltage range
Current sense
blanking interval
Delay from CS trip
to DRV lo
DRV output rise time
VDRV(lo) IOUT = 10 mA
fosc
RT = 1.00 MΩ
RT = 223 KΩ
VLD @ TA 85°C , VIN = 12V
TBLANK VCS = 0.55 VLD, VLD = VDD
tDELAY
VIN = 12V, VLD = 0.15, VCS = 0 to
0.22V after TBLANK
tRISE
CDRV = 500pF, 10% to 90% VDRV
50 100 150 KΩ
225
VDD-
0.3
0
20
80
0
250
25
100
275 mV
VDD
V
0.3 V
30
120
KHz
250 mV
150 215 280 nS
300 nS
30 50 nS
DRV output fall time
tFALL
CDRV = 500pF, 90% to 10% VDRV
30 50 nS
Copyright © 2009 Oristreak Ltd.,
HTTP://WWW.ORISTREAK.COM
-4-
HY7700 V1.0

4페이지










HY7700 전자부품, 판매, 대치품
HY7700
High Brightness LED Driver
Oscillator
. The oscillator in the HY7700 is controlled by a single resistor connected at the RT pin. The
equation governing the oscillator time period tosc is given by:
tosc (us)
=
RT (K)
25
+
22
If the resistor is connected between RT and GND, HY7700 operates in a constant frequency mode
and the above equation determines the time-period. If the resistor is connected between RT and DRV, the
HY7700 operates in a constant off-time mode and the above equation determines the off-time.
DRV Output
The DRV output of the HY7700 is used to drive an external MOSFET. It is recommended that the
DRV charge of the external MOSFET be less than 25nC for switching frequency 100kHz and less than
15nC for switching frequency > 100kHz.
Linear Dimming
The Linear Dimming pin is used to control the LED current. There are two cases when it may be
necessary to use the Linear Dimming pin.
In some cases, it may not be possible to find the exact RSE value required to obtain the LED
current when the internal 250mV is used. In these cases, an external voltage divider from the VDD pin
can be connected to the LD pin to obtain a voltage (less than 250mV) corresponding to the desired
voltage across RSE.
Linear dimming may be desired to adjust the current level to reduce the intensity of the LED(s).
In these cases, an external 0-250mV voltage can be connected to the LD pin to adjust the LED current
during operation. To use the internal 250mV, the LD pin can be connected to VDD .
Note: Although the LD pin can be pulled to GND, the output current will not go to zero. This is due to
the presence of a minimum on-time (which is equal to the sum of the blanking time and the delay to
output time) which is about 450ns. This will cause the MOSFET to be on for a minimum of 450ns and
thus the LED current when LD = GND will not be zero. This current is also dependent on the input
voltage, inductance value, and forward voltage of the LED and circuit parasites. To get zero LED current,
the EN pin has to be used.
PWM Dimming
PWM Dimming can be achieved by driving the EN pin with a low frequency square wave signal.
When the PWM signal is zero, the gate driver is turned off and when the EN signal if high, the gate
driver is enabled. Since the EN signal does not turn off the other parts of the IC, the response of the
HY7700 to the EN signal is almost instantaneous. The rate of rise and fall of the LED current is thus
determined solely by the rise and fall times of the inductor current. To disable PWM dimming and
enable the HY7700 permanently, connect the EN pin to VDD.
Copyright © 2009 Oristreak Ltd.,
HTTP://WWW.ORISTREAK.COM
-7-
HY7700 V1.0

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