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부품번호 | PAM2423 기능 |
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기능 | PWM STEP-UP DC-DC CONVERTER | ||
제조업체 | Diodes | ||
로고 | |||
전체 10 페이지수
PAM2421/ PAM2422/ PAM2423
3A, 4.5A, 5.5A PWM STEP-UP DC-DC CONVERTER
Description
The PAM242x devices are high-performance, fixed frequency,
current-mode PWM step-up DC/DC converters that incorporate
internal power MOSFETs. The PAM242x includes an integrated
power MOSFET that supports peak currents of up to 3A/4.5A/5.5A.
The PAM242x utilizes simple external loop compensation allowing
optimization between component size, cost and AC performance
across a wide range of applications. Additional functions include an
externally programmable soft-start function for easy inrush current
control, internal over-voltage protection (OVP), cycle-by-cycle current
limit protection, under voltage lock-out and thermal shutdown.
The PAM242x is available in the small SO-8EP package.
Pin Assignments
SO-8EP
Features
Greater than 90% Efficiency
Adjustable Output Voltage Up to 24V
Internal 24V Power MOSFET
Peak Current 3A,4.5A,5.5A
520kHz Frequency
Built-in Over-Voltage Protection (OVP)
Open Protection
Programmable Soft-Start Function
Thermal Shutdowns
Under-Voltage-Lockout
Over-Current Protection
SO-8EP Package
Applications
TFT LCD Monitors
Battery-Powered Equipment
Set-Top Boxes
DSL and Cable Modems and Routers
Typical Applications Circuit
VIN
3.6V ~ 5.5V
C1
470mF
C2
10mF
C3
1mF
R3 C6
51k 47pF
C7
2.2nF
L1
6.8mH
PGND
SW
SS34
VIN PAM242X SS
EN
COMP
AGND
FB
C8
10nF
C4
10mF
R1
85k
VOUT
12V/800mA
C5
470mF
R2
10k
PAM2421/ PAM2422/ PAM2423
Document number: DS36383 Rev. 2 - 2
1 of 10
www.diodes.com
January 2016
© Diodes Incorporated
PAM2421/ PAM2422/ PAM2423
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Parameter
Input Voltage
Under Voltage Lockout Threshold
Under Voltage Lockout Hysteresis
Quiscent Supply
Supply Current in Shutdown
Switching Frequency
Maximum Duty Cycle
FB Feedback Voltage
FB Input Current
FB Voltage Line Regulation
Switch Current Limit
Switching On Resisitance
Switch Leakage Current
Soft Start Pin Bias Current
Logic High Threshold
Logic Low Threshold
EN Pull Down Resistor
Thermal Shutdown Temperature
Thermal Shutdown Hystersis
Test Conditions
-
VIN Rising
-
VFB = 1.4V, Not Switching
VFB = 1.0V, Switching
EN = Ground
-
-
-
-
VFB from 2.7V to 5.5V
PAM2421
PAM2422
PAM2423
VIN = 3.2V
Duty Cycle = 70%
PAM2421
-
PAM2422
-
PAM2423
-
VSW = 10V, EN = Ground
VSS = 1.2V
EN Pin
EN Pin
-
-
-
Min
2.7
-
-
-
-
-
-
85
1.230
-
-
3
4.5
5.5
-
-
-
2.0
1.4
-
-
-
-
Typ
-
2.5
200
0.25
3
0.1
520
-
1.262
0
0.05
-
-
-
130
100
70
-
4.5
-
-
1
+160
+40
Max
5.5
-
-
0.35
5
1.0
-
-
1.294
80
0.15
-
-
-
-
-
-
15
7.0
-
0.4
-
-
-
Unit
V
V
mV
mA
µA
kHz
%
V
nA
%/V
A
mΩ
µA
µA
V
V
mΩ
°C
°C
PAM2421/ PAM2422/ PAM2423
Document number: DS36383 Rev. 2 - 2
4 of 10
www.diodes.com
January 2016
© Diodes Incorporated
4페이지 PAM2421/ PAM2422/ PAM2423
Application Information
The PAM242x are highly efficient step-up DC/DC converters that employ a current mode, fixed frequency pulse-width modulation (PWM)
architecture with excellent line and load regulation.The PAM242x operate at constant switching frequency under medium to high load current
conditions. At light loads, these devices operate in a pulse-skipping mode in order to improve light-load efficiency.
Soft-Start
The PAM242x both offer a programmable soft-start function which minimizes inrush current during startup. The soft-start period is programmed
by connecting a 10nF capacitor between SS and Ground. Operation of the soft-start function is as follows: when the IC is disabled, SS is actively
discharged to Ground. Upon enabling the IC, CSS is charged with a 4.5µA current so that the voltage at SS increases in a controlled manner.
The peak inductor current is limited by the voltage at SS, so that the input current is limited until the soft-start period expires, and the regulator
can achieve its full output current rating.
Setting the Output Voltage
The both feature external adjustable output voltages of up to 24V. To program the output voltage, simply connect a resistive voltage divider
between the output, FB, and GND, with resistors set according to the following equation:
R1
R2x
VOUT
VFB
1
Where VFB is 1.262V.
Rectifier Selection
For optimal performance, the rectifier should be a Schottky rectifier that is rated to handle both the output voltage as well as the peak switch
current.
Open Voltage Protection
The features internal automatic over-voltage protection, when feedback voltage is higher than 115%.
Open Protection
Once the outputs achieve regulation, if the voltage at FB falls below 0.2V the controller will automatically disable, preventing the controller from
running open-loop and potentially damaging the IC and load.
Shutdown
Drive EN low to disable the IC and reduce the supply current to just 0.1µA. As with all nonsynchronous step-up DC/DC converters, the external
Schottky diode provides a DC path from the input to the output in shutdown. As a result, the output drops to one diode voltage drop below the
input in shutdown.
The PAM242x both feature integrated thermal overload protection. Both devices are automatically disabled when their junction temperatures
exceed +160°C, and automatically re-enable when the die temperature decreases by 40°C.
PAM2421/ PAM2422/ PAM2423
Document number: DS36383 Rev. 2 - 2
7 of 10
www.diodes.com
January 2016
© Diodes Incorporated
7페이지 | |||
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부품번호 | 상세설명 및 기능 | 제조사 |
PAM2421 | PWM STEP-UP DC-DC CONVERTER | Diodes |
PAM2421 | PWM STEP-UP DC-DC CONVERTER | Power Analog Micoelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |