CS52843 Datasheet, PDF (1/9 Pages) Cherry Semiconductor Corporation – Current Mode PWM Control Circuit

CS52843
Current Mode
PWM Control Circuit
The CS52843 provides all the necessary features to implement
off−line fixed frequency current−mode control with a minimum
number of external components.
The CS52843 incorporates a new precision temperature−controlled
oscillator to minimize variations in frequency. An undervoltage
lockout ensures that V_REF is stabilized before the output stage is
enabled. In the CS52843 turn on is at 8.4 V and turn off at 7.6 V.
Other features include low start−up current, pulse−by−pulse current
limiting, and a high−current totem pole output for driving capacitive
loads, such as gate of a power MOSFET. The output is low in the off
state, consistent with N−channel devices.
Features
• Optimized for Off−Line Control
• Internally Temperature Compensated Oscillator
• V_REF Stabilized before Output Stage is Enabled
• Very Low Start−Up Current 300 μA (typ)
• Pulse−by−Pulse Current Limiting
• Improved Undervoltage Lockout
• Double Pulse Suppression
• 2.0% 5.0 Volt Reference
• High Current Totem Pole Output
http://onsemi.com
8
1
SO−8
D SUFFIX
CASE 751
14
1
SO−14
D SUFFIX
CASE 751A
PIN CONNECTIONS AND
MARKING DIAGRAMS
COMP ¹
V_FB
Sense
OSC
V_REF
V_CC
V_OUT
GND
1
COMP
NC
V_FB
NC
Sense
NC
OSC
14
V_REF
NC
V_CC
V_CC Pwr
V_OUT
Pwr GND
GND
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
Device
Package
Shipping
CS52843ED8
CS52843EDR8
CS52843ED14
CS52843EDR14
SO−8
SO−8
SO−14
SO−14
95 Units/Rail
2500 Tape & Reel
55 Units/Rail
2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 4
Publication Order Number:
CS52843/D