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EM8800A PDF даташит

Спецификация EM8800A изготовлена ​​​​«Excelliance MOS» и имеет функцию, называемую «Current-Mode Controller».

Детали детали

Номер произв EM8800A
Описание Current-Mode Controller
Производители Excelliance MOS
логотип Excelliance MOS логотип 

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EM8800A Даташит, Описание, Даташиты
EM8800A
Constant Off Time, Current-Mode Controller for LED Applications
General Description
EM8800A is a constant off time current mode
controller. This device can operated with a fixed off
time of the power switch. The TOFF pin is provided
to set the off time. In addition, the PWMD pin
enables the user to use a PWM signal to modulate
the switching pattern and adjust the average
luminosity. The LD/SS pin enables the user to set
peak current by adjust the voltage of this pin.
This part includes internal soft start, maximum
on time protection, over current protection and
thermal shutdown function. This part is available in
SOP-8 package.
Ordering Information
Part Number Package
EM8800AG SOP-8
Remark
Features
Constant Off Time Current-Mode Control
Adjustable Off Time
Internal Leading Edge Blanking
Internal Start Up Delay
Maximum On Time Protection
Over Current Protection
Thermal Shutdown
Applications
LED Backlight or lighting
RGB Backlight or lighting
Organic Light-Emitting Diode Backlight or
lighting
AC-DC or DC-DC LED Driver applications.
Pin Configuration
Typical Application Circuit
VLED-in
FAULT
VCC
PWMD EM8800A GATE
CS
LD/SS
TOFF G D
2011/09/06
Rev.A.3
1









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EM8800A Даташит, Описание, Даташиты
Pin Assignment
EM8800A
Pin Name Pin No.
Pin Function
TOFF
PWMD
VCC
CS
GATE
GND
LD/SS
FAULT
1
OFF Time Setting. A resistor to ground to set off time. Pulling this pin to ground will disable
the device.
2
PWM Dimming. This pin is used for PWM dimming. When the voltage applied to this pin is
low, switching is inhibited. When the voltage applied to this pin is high, switching restarts.
Supply Voltage. This pin provides the bias supply for the EM8800A. The supply voltage is
3 internally regulated to 5VDD for internal control circuit. Connect a well-decoupled supply
voltage to this pin. Ensure that a decoupling capacitor is placed near the IC.
4 Current Sense Input. This pin senses the peak current.
5 Driver OUTPUT. The output of the driver is connected to the gate of the external MOSFET.
Signal and Power Ground for the IC. All voltages levels are measured with respect to this
6 pin. Tie this pin to the ground island/plane through the lowest impedance connection
available.
7
Linear Dimming and Soft Start. A capacitor connected to the pin sets the soft start period.
The voltage of this pin adjusts the peak current.
8 Fault. This pin is asserted high when a fault condition is detected.
2011/09/06
Rev.A.3
2









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EM8800A Даташит, Описание, Даташиты
Function Block Diagram
Internal VDD
OVP
FAULT
LD/SS
CS
LEB
OCP
comparator
+
Control
Logic
Internal VDD
1.5V
-
20uA
/3
Max
on
- PG
1V -
LEB
+
Peak Current
comparator
OTP
UVLO
Toff
Internal VDD
S
Q
R
EM8800A
VCC
22V
9.75V/8.25V
TOFF
Soft
Driver
PWMD
GATE
GD
2011/09/06
Rev.A.3
3










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Номер в каталогеОписаниеПроизводители
EM8800ACurrent-Mode ControllerExcelliance MOS
Excelliance MOS

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