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Longtium Microelectronics

LT1548 Datasheet Preview

LT1548 Datasheet

High Precision CC/CV Primary-Side PWM Power Switch

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LT1548
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL DESCRIPTION
LT1548 is a high performance offline
PWM Power switch for low power AC/DC
charger and adaptor applications. It operates in
primary-side sensing and regulation.
Consequently, opto-coupler and TL431 could be
eliminated. Proprietary Constant Voltage (CV)
and Constant Current (CC) control is 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.
LT1548 offers power on soft start control
and protection coverage with auto-recovery
features including Cycle-by-Cycle current
limiting, VDD OVP, VDD clamp and UVLO.
Excellent EMI performance is achieved with
On-Bright proprietary frequency shuffling
technique. High precision constant voltage (CV)
and constant current (CC) can be achieved by
LT1548.
FEATURES
5% Constant Voltage Regulation, 5%
Constant Current Regulation at Universal
AC input
Primary-side Sensing and Regulation
Without TL431 and Opto-coupler
Programmable CV and CC Regulation
Adjustable ConstantLCEuDrrentand Output
Power Setting
Built-in Secondary Constant Current
Control with Primary Side Feedback
Built-in Adaptive Current Peak Regulation
Built-in Primary winding inductance
compensation
Programmable Cable drop Compensation
Power on Soft-start
2
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
VDD Under Voltage Lockout with
Hysteresis (UVLO)
VDD OVP,VDD Clamp
Offered in DIP8 package
APPLLICATIONS
Low Power AC/DC offline SMPS for :
Cell Phone ChargerDigital Cameras Charger
Small Power Adaptor
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
Xi′an Longtium Microelectronics Technology Developing Co., Ltd
2011-AUG Version1.0
1 /10
www.longtiumic.com




Longtium Microelectronics

LT1548 Datasheet Preview

LT1548 Datasheet

High Precision CC/CV Primary-Side PWM Power Switch

No Preview Available !

TYPICAL APPLICATION
A~C
LT1548
.
.Ns
Np
Vo
18
VDD DRAIN
27
COMP DRAIN
3
GND
6
NC
4
INV
5
CS
Rs
. NAUX
GENERAL INFORMATION
Pin Configuration
VDD 1 O
COMP 2
GND 3
INV 4
8 DRAIN
7 DRAIN
6 NC
5 CS
Terminal Assignments
Pin Num
1
2
Pin Name I/O
VDD
P
COMP
I
Description
Power Supply
Loop Compensation For CV Stability
3 GND
P ground
4 INV
I The voltage feedback from auxiliary winding. Connected to
resistor driver from auxiliary winding reflecting output voltage.
PWM duty cycle is determined by ea output and current sense
signal at pin 4.
5 CS
I Current sense input
6 NC
No connect
7/8 DRAIN O HV MOSFET drain pin.
The drain pin is connected to the primary lead of the transformer
Xi′an Longtium Microelectronics Technology Developing Co., Ltd
2011-AUG Version1.0
2 / 10
www.longtiumic.com


Part Number LT1548
Description High Precision CC/CV Primary-Side PWM Power Switch
Maker Longtium Microelectronics
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LT1548 Datasheet PDF






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