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Power Switch. DP2540A Datasheet |
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DP2540A
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL DESCRIPTION
DP2540A is a high performance offline PWM
power switch for low power AC/DC charger and
adapter applications.It operates in primary-side
sensing and regulation.Consequently, opto-coupler
and TL431 could be eliminated. High Precision
Constant Voltage (CV) and Constant Current (CC)
control are integrated as shown in the figure below.
In CC control, the current and output power setting
can be adjusted externally by the sense resistor Rs
at CS pin. In CV control, multi-mode operations are
utilized to achieve high performance and high
efficiency. In addition, good load regulation is
achieved by the built-in Cable Drop Compensation.
Device operates in PFM in CC mode as well at
large load condition and it operates in PWM with
frequency reduction at light/medium load. The chip
consumes very low operation current, it can
achieve less than 75mW standby power.
DP2540A offers comprehensive protection
coverage with auto-recovery features including
Cycle-by-Cycle current limiting, VDD Over Voltage
Protection (VDD OVP), short circuit protection,
built-in leading edge blanking, VDD under voltage
lockout (UVLO), OTP, etc.
High precision constant voltage (CV) and constant
current (CC) can be achieved by DP2540A.
DP2540A is offered in DIP7/SOP7 package.
TYPICAL APPLICATION
FEATURES
■ ± 5% Constant Voltage Regulation and
Current Regulation at Universal AC Input
■ Primary Side Regulation (PSR) Without TL431
and Opto-coupler
■ No Need for Control Loop Compensation
■ Programmable CV and CC Regulation
■ Multi-Mode PWM/PFM Operation
■ Output Short Load Protection
■ Less than 75mW Standby Power
■ Built-in Line Voltage and Primary Winding
Inductance Compensation
■ Built-in Adaptive Current Peak Regulation
■ Programmable Cable Drop Compensation
■ Audio Noise Free Operation
■ Built-in Over Temperature Protection (OTP)
■ Soft Gate Driver for Good EMI Performance
■ Built-in Leading Edge Blanking (LEB)
■ Cycle-by-Cycle Current Limiting
■ VDD Under Voltage Lockout with Hysteresis
(UVLO)
■ VDD OVP & Clamp
APPLICATIONS
Low Power AC/DC offline SMPS for
■ Cell Phone Charger
■ Digital Camera Charger
■ Small Power Adapter
■ Auxiliary Power for PC, TV etc.
■ Linear Regulator/RCC Replacement
www.depuw.com
- 1 -/10
Rev.1.0 JULY 2016
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DP2540A
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL INFORMATION
Pin Configuration
The pin map of DIP7 /SOP7 package is shown
as below.
Ordering Information
Part Number
Description
DP2540A
DIP7, Rohs, 50Pcs/Tube
SOP7, Halogen
free,3000PCS/Reel
Package Dissipation Rating
Package
DIP7/SOP7
RJA (℃/W)
75/90
Absolute Maximum Ratings
Parameter
Value
Drain Voltage (off state)
-0.3 to 650V
VDD Zener Clamp Voltage
VDD_Clamp
VDD Clamp
Current
Continuous 10 mA
CS Input Voltage
-0.3 to 7V
INV Input Voltage
-0.3 to 7V
Maximum Operating Junction
Temperature TJ
150 oC
Min/Max Storage Temperature
Tstg
-55 to 150 oC
Lead Temperature (Soldering,
10secs)
260 oC
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These
are stress ratings only, functional operation of the device at
these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure
to absolute maximum-rated conditions for extended periods
may affect device reliability.
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- 2 -/10
Rev.1.0 JULY 2016
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Marking Information
DP2540A
High Precision CC/CV Primary-Side PWM Power Switch
DP2540A for product name;
XXXXXX the first X reresents the last year,2016 is 6; The second X represents the month, in
A-L 12 letters;The third and fourth X on behalf of the date, 01-31 said; The last two X represents
the wafer batch code.
TERMINAL ASSIGNMENTS
Pin Num
1
2
3
4
5/6
7
Pin Name
VDD
NC
INV
CS
Drain
GND
I/O Description
P Power supply.
- No connect.
I
The voltage feedback from auxiliary winding. Connected to resistor divider
from auxiliary winding reflecting output voltage.
I Current sense input.
O The Power MOSFET Drain
P Ground.
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- 3 -/10
Rev.1.0 JULY 2016
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