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RS2051 Datasheet Preview

RS2051 Datasheet

Novel Low Cost Green-Mode PWM Controller

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RS2051 pdf
RS2051
Novel Low Cost Green-Mode PWM Controller
with Soft Start & Latch Mode
Page No. : 1/13
Description
The RS2051 is a highly integrated low cost current mode PWM controller, which is ideal for small power current mode of offline
AC-DC fly-back converter applications. Making use of external resistors, the IC changes the operating frequency and
automatically enters the PFM/CRM (Cycle Reset Mode) under light-load/zero-load conditions. This can minimize standby power
consumption and achieve power-saving functions. With a very low start-up current, the RS2051 could use a large value start-up
resistor (2Mohms). Built-in synchronized slope compensation enhances the stability of the system and avoids sub-harmonic
oscillation. Dynamic peak current limiting circuit minimizes output power change caused by delay time of the system over a
universal AC input range. Leading edge blanking circuit on current sense input could remove the signal glitch due to snubber
circuit diode reverse recovery and thus greatly reduces the external component count and system cost in the design. Cycle-by-
Cycle current limiting ensures safe operation even during short-circuit.
Excellent EMI performance is achieved built-in soft start with 1.2mSsoft driver and frequency jitter.
The RS2051 offers perfect protection like OVP(Over Voltage Protection)OLP(Over Load Protection)SCP(Short circuit
protection)OTPSense Fault Protection LM (Latch Mode) and OCP(Over current protection). The RS2051’s output driver
is soft clamped to maximum 16.5V to protect the power MOSFET. RS2051 is offered in SOT-23-6L, SOT-8 and DIP-8 packages.
Features
Low Cost, PWM&PFM&CRM (Cycle Reset Mode)
Low Start-up Current (about 1.5μA)
Low Operating Current (about 2.2mA)
Current Mode Operation
Under Voltage Lockout (UVLO)
Built-in Synchronized Slope Compensation
Built-in fixed soft start with 1.2mS
Built-in Frequency jitter for better EMI Signature
Programmable PWM Frequency
Audio Noise Free Operation
Leading edge Blanking on Sense input
Constant output power limiting for universal AC input
Range
Applications
Switching AC/DC Adaptor
Battery Charger
Open Frame Switching Power Supply
Standby Power Supplies
Set-Top Box Power Supplies
384X Replacement
SOT-23-6LSOP8 and DIP-8 Pb-Free Packaging
Compatible with SG6848 (6849) / SG5701 / SG5848 /
LD7535 (7550) / OB2262 (2263) / OB22782279
Soft Clamped GATE output voltage 16.5V
VDD over voltage protect 25.6V
Cycle-by-cycle current limiting
Sense Fault Protect ion
OTP (Over Temperature Protection)
Output SCP (Short circuit Protection)
Output OLP (Over Load Protection)
Latch mode After OLP&SCP
High-Voltage CMOS Process with ESD
Pin Configurations
DS-RS2051-02 September, 2007
www.Orister.com



Orister
Orister

RS2051 Datasheet Preview

RS2051 Datasheet

Novel Low Cost Green-Mode PWM Controller

No Preview Available !

RS2051 pdf
Page No. : 2/13
Name
GND
FB
RI
SEN
VDD
GATE
Description
GND Pin
Voltage feedback pin. Output current of this pin could controls the PWM duty
cycleOLP and SCP.
This pin is to program the switching frequency. By connecting a resistor to ground
to set the switching frequency
Current sense pin, connect to sense the MOSFET current
Supply voltage pin
Totem output to drive the external Power MOSFET.
Typical Application Circuit
Block Diagram
DS-RS2051-02 September, 2007
www.Orister.com


Part Number RS2051
Description Novel Low Cost Green-Mode PWM Controller
Maker Orister
Total Page 13 Pages
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