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PDF EM5301 Data sheet ( Hoja de datos )
| Número de pieza | EM5301 | |
| Descripción | PWM Controller | |
| Fabricantes | Excelliance MOS | |
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5V/12V Synchronous Buck PWM Controller
EM5301
General Description
EM5301 is a synchronous rectified PWM
controller operating with 5V or 12V supply voltage.
This device operates at 200/300/500 kHz and
provides an optimal level of integration to reduce
size and cost of the power supply.
This part includes internal soft start, over
current protection, under voltage protection, over
voltage protection, and shutdown function. This
part is available in PSOP-8 package.
Ordering Information
Part Number Package Frequency
EM5301GE PSOP-8 200kHz
Reference
Voltage
0.8V
EM5301AGE PSOP-8 300kHz
0.8V
EM5301BGE PSOP-8 500kHz
0.8V
EM5301CGE PSOP-8 200kHz
0.6V
EM5301DGE PSOP-8 300kHz
0.6V
EM5301EGE PSOP-8 500kHz
0.6V
Applications
Notebook & Netbook
Graphic Cards & MB
Low Voltage Logic Supplies
Pin Configuration
Typical Application Circuit
Features
Operate from 5V to 12V Voltage Supply
0.8V or 0.6V VREF with 1.0% Accuracy
Voltage Mode PWM Control
200kHz or 300kHz or 500kHz 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
2013/04/22
Rev.A.5
1
1 page  
EM5301
Error Amplifier
Open Loop DC Gain
Gain-Bandwidth Product
AO
GBW
88 dB
15 MHz
Maximum Duty
DMAX EM5301/A/C/D
EM5301B/E
80 %
75 %
PWM Controller Gate Drivers
Upper Gate Sourcing Current
Upper Gate Sinking Current
Upper Gate RDS(ON) Sinking
Lower Gate Sourcing Current
Lower Gate Sinking Current
Lower Gate RDS(ON) Sinking
PHASE Falling to LGATE Rising
Delay
LGATE Falling to UGATE Rising
Delay
Reference Voltage
IUG_SRC
IUG_SNK
RUG_SNK
ILG_SRC
ILG_SNK
RLG_SNK
VBOOT - VPHASE = 12V,
VBOOT - VUGATE = 6V
VBOOT - VPHASE = 12V,
VUGATE – VPHASE = 6V
VBOOT - VPHASE = 12V,
VUGATE – VPHASE = 0.1V
VCC – VLGATE = 6V
VLGATE = 6V
VLGATE = 0.1V
VCC = 12V; (VUGATE - VPHASE)< 1.2V to
VLGATE > 1.2V
VCC = 12V; VLGATE < 1.2V to (VUGATE -
VPHASE) > 1.2V
-1.2
1.5
24
-1.2
1.5
12
30 90
30 90
A
A
Ω
A
A
Ω
ns
ns
Nominal Feedback Voltage
EM5301/A/B
VFB EM5301C/D/E
0.792 0.8 0.808 V
0.592 0.6 0.608 V
Protection section
FB Under Voltage Protection
FB Over Voltage Protection
LGATE OC Setting Current
Over Current Threshold1
Soft-Start Interval
VFB_UVP
VFB_OVP
IOCSET
VPHA_OC1
TSS
FB falling
FB rising
RLGATE=8Kohm
EM5301/B/C/E
EM5301A/D
68 75 82
120 130 145
22 25 28
-400
3.6
2.4
%
%
uA
mV
ms
ms
COMP Enable Threshold
VCOMP/EN
0.2 V
Temperature Shutdown
TSD
165 ℃
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θJA PSOP-8 packages is 52°C /W on JEDEC 51-7 (4 layers,2S2P) thermal test board with 50mm2 copper area.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
2013/04/22
Rev.A.5
5
5 Page 
Power MOSFET Selection
The EM5301 requires two N-Channel power
MOSFETs. These should be selected based upon
on-resistance, breakdown voltage, gate supply
requirement, and thermal management
requirements.
In high current applications, the MOSFET power
dissipation, package selection and heat sink are the
dominate design factor. The power dissipation
includes two loss components: conduction loss and
switching loss. The conduction losses are the
largest component of power dissipation for both
the upper and lower MOSFETs. These losses are
distributed between the two MOSFETs according
to duty factor.
The power dissipations in the two MOSFETs are
approximately the following equation:
PDUPPER
=
I2
OUT
* RDS(ON)
*D
+
0.5 *IOUT
* VIN
* FSW
* tSW
PDLOWER
=
I2
OUT
* RDS(ON)
* (1 - D)
Where D is the duty cycle, tSW is the combined
switch ON and OFF time.
EM5301
2013/04/22
Rev.A.5
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EM5301.PDF ] | |
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