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EM5302A PDF даташит

Спецификация EM5302A изготовлена ​​​​«Excelliance MOS» и имеет функцию, называемую «PWM Controller».

Детали детали

Номер произв EM5302A
Описание PWM Controller
Производители Excelliance MOS
логотип Excelliance MOS логотип 

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EM5302A Даташит, Описание, Даташиты
EM5302/A
5V/12V Synchronous Buck PWM Controller with Reference Input
General Description
EM5302/A is a synchronous rectified PWM
controller operating with 5V or 12V supply voltage.
This device operates at 200/300 kHz and provides
an optimal level of integration to reduce size and
cost of the power supply.
This part includes internal soft start, internal
compensation networks, over current protection,
under voltage protection, and shutdown function.
This part is available in PSOP-8 package.
Ordering Information
Part Number
EM5302GE
Package
PSOP-8
Frequency
200kHz
EM5302AGE
PSOP-8
300kHz
Applications
Notebook & Netbook
Graphic Cards & MB
Low Voltage Logic Supplies
Pin Configuration
Features
Operate from 5V to 12V Voltage Supply
0.6V VREF with 1.5% Accuracy
Support Tracking Mode and Stand Alone
Mode Operation
Voltage Mode PWM Control
200kHz or 300kHz Fixed Frequency
Oscillator
0% to 80% Duty Cycle
Internal Soft Start
Over Current Protection
Integrated Bootstrap Diode
Adaptive Non-Overlapping Gate Driver
Under Voltage Protection
Over Voltage Protection
Typical Application Circuit
2012/10/16
Rev.A.5
1









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EM5302A Даташит, Описание, Даташиты
Pin Assignment
EM5302/A
Pin Name Pin No.
Pin Function
BOOT
UGATE
GND
LGATE
VCC
FB
REFIN
PHASE
Bootstrap Supply for the floating upper gate driver. Connect the bootstrap
capacitor C BOOT between BOOT pin and the PHASE pin to form a bootstrap circuit.
1 The bootstrap capacitor provides the charge to turn on the upper MOSFET. Typical
values for C BOOT range from 0.1uF to 0.47uF. Ensure that C BOOT is placed near the
IC.
Upper Gate Driver Output. Connect this pin to the gate of upper MOSFET. This pin
2 is monitored by the adaptive shoot-through protection circuitry to determine when
the upper MOSFET has turned off.
Signal and Power Ground for the IC. All voltages levels are measured with respect
3 to this pin. Tie this pin to the ground island/plane through the lowest impedance
connection available.
Lower Gate Driver Output. Connect this pin to the gate of lower MOSFET. This pin
4 is monitored by the adaptive shoot-through protection circuitry to determine when
the lower MOSFET has turn off.
Supply Voltage. This pin provides the bias supply for the EM5302/A and the lower
5
gate driver. The supply voltage is internally regulated to 5VDD for internal control
circuit. Connect a well-decoupled 4.5V to 13.2V supply voltage to this pin. Ensure
that a decoupling capacitor is placed near the IC.
6
Feedback Voltage. This pin is the inverting input to the error amplifier. A resistor
divider from the output to GND is used to set the regulation voltage.
External Reference Input for Tracking Mode Operation. This pin receives a voltage
7
with range from 0.4V to 2V as the reference voltage. Pulling this pin lower than
0.3V disables the controller and causes the oscillator to stop, the UGATE and LGATE
outputs to be held low.
PHASE Switch Node. Connect this pin to the source of the upper MOSFET and the
drain of the lower MOSFET. This pin is used as the sink for the UGATE driver, and to
monitor the voltage drop across the lower MOSFET for over current protection.
8 This pin is also monitored by the adaptive shoot-through protection circuitry to
determine when the upper MOSFET has turned off. A Schottky diode between this
pin and ground is recommended to reduce negative transient voltage which is
common in a power supply system.
2012/10/16
Rev.A.5
2









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EM5302A Даташит, Описание, Даташиты
Function Block Diagram
VCC
5
Soft Start
Internal
regulator
POR
FB 6
-
- EA
+
OTP
Ramp
PWM
Reference
REFI 7
0.3V
Oscillator
VCC
17V
Enable
65% Vref
FB
FB
130% Vref
EM5302/A
Gate
control
logic
VCC
1 BOOT
2 UGATE
8 PHASE
VOCP
4 LGATE
3 GD
2012/10/16
Rev.A.5
3










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