CS3842A Cherry Semiconductor Corporation, CS3842A Datasheet

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CS3842A

Manufacturer Part Number
CS3842A
Description
Manufacturer
Cherry Semiconductor Corporation
Datasheet

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Rev. 10/23/98
COMP
The CS284XA, CS384XA provides all
the necessary features to implement
off-line fixed frequency current-mode
control with a minimum number of
external components.
The CS384XA family incorporates a
new precision temperature-controlled
oscillator with an internally trimmed
discharge current to minimize varia-
tions in frequency. A precision duty-
cycle clamp eliminates the need for an
external oscillator when a 50% duty-
cycle is used. Duty-cycles greater than
50% are also possible. On board logic
ensures that V
Sense
Supply Voltage (I
Supply Voltage (Low Impedance Source) .................................................................30V
Output Current..............................................................................................................±1A
Output Energy (Capacitive Load) ................................................................................5µJ
Analog Inputs (V
Error Amp Output Sink Current .............................................................................10mA
Lead Temperature Soldering
OSC
V
Gnd
V
Off-Line Current Mode PWM Control
CC
FB
Wave Solder (through hole styles only) ..........10 sec. max, 260°C peak
Reflow (SMD styles only) ...........60 sec. max above 183°C, 230°C peak
Circuit with Undervoltage Lockout
34V
REF
Amplifier
(8.4V/7.6V)
+
16V/10V
Error
FB
Oscillator
is stabilized before
CC
, Sense) ...........................................................................-0.3V to 5.5V
<30mA).........................................................................Self Limiting
2.50V
V
Lock-out Circuit
Undervoltage
C
Absolute Maximum Ratings
( ) Indicates CS-2843A/3843A
Description
2 R
Block Diagram
R
Reset
Set/
Output
Enable
1 V
Reference
the output stage is enabled. Ion
implant resistors provide tighter con-
trol of undervoltage lockout.
Other features include low start-up
current, pulse-by-pulse current limit-
ing, and a high-current totem pole out-
put for driving capacitive loads, such
as the gate of power MOSFET. The out-
put is LOW in the off state, consistent
with N-channel devices.
The CS384XA series of current-mode
control ICs are available in 8 and14
lead packages for surface mount (SO)
applications as well as 8 lead PDIP
packages.
Comparator
5V
Sensing
Current
CS2842A/CS3842A
CS2843A/CS3843A
S
R
PWM
Latch
NOR
Internal
Bias
1
V
V
V
Pwr Gnd
CC
REF
OUT
Pwr
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
COMP
Sense
Cherry Semiconductor Corporation
OSC
Web Site: www.cherry-semi.com
8 Lead PDIP & SO Narrow
V
Email: info@cherry-semi.com
Optimized for Off-line
Control
Internally Trimmed
Temperature
Compensated Oscillator
Maximum Duty-cycle
Clamp
V
Output Stage is Enabled
Low Start-up Current
Pulse-by-pulse Current
Limiting
Improved Undervoltage
Lockout
Double Pulse Suppression
1% Trimmed Bandgap
Reference
High Current Totem Pole
Output
FB
Package Options
Sense
COMP
REF
OSC
14 Lead SO Narrow
V
NC
NC
NC
1
2
3
4
FB
Features
stabilized before
1
2
3
4
5
6
7
A
14
13
12
10
11
9
8
V
8
7
6
5
V
V
NC
V
Pwr Gnd
Gnd
®
CC
REF
CC
OUT
Company
V
V
V
Gnd
Pwr
REF
CC
OUT

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CS3842A Summary of contents

Page 1

... CS2842A/CS3842A CS2843A/CS3843A Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout Description The CS284XA, CS384XA provides all the output stage is enabled. Ion the necessary features to implement implant resistors provide tighter con- off-line fixed frequency current-mode trol of undervoltage lockout. control with a minimum number of Other features include low start-up external components ...

Page 2

... J Output Section Output Low Level I = 20mA SINK I = 200mA SINK Output High Level I = 20mA SOURCE I = 200mA SOURCE ≤ 70˚C for CS3842A/3843A 15V (Note 1 3.3nF for sawtooth mode (see Figure 3), unless otherwise stated. T CS2842A/CS2843A CS3842A/CS3843A MIN TYP MAX MIN TYP 4.95 5.00 5.05 4.90 5 ...

Page 3

... MIN TYP MAX MIN TYP 50 150 50 50 150 -0.01 -10.00 -0.01 -10.00 µA 0.5 1.0 0.5 = 10kΩ 3.3nF CS2842A CS3842A CS2843A/CS3843A TYP MAX MIN TYP MAX MIN TYP 14.5 16.0 17.5 7.8 8 8.5 10.0 11.5 7.0 7.6 3. Parameter measured at trip point of latch with VFB=0. 4. Gain defined as: ∆V COMP A = ∆ ...

Page 4

Typical Performance Characteristics Oscillator Frequency 900 800 R =680Ω T 700 600 500 R =1.5kΩ T 400 300 200 R =10kΩ T 100 .0005 .001 .002 .003 .005 .01 .02 .03 .04 C (µ ...

Page 5

Circuit Description: continued V OSC OSC RESET EA Output Switch Current OUT V OUT Figure 2: Timing Diagram for key CS2841B parameters V REF R T OSC C T Gnd Timing parameters V upper V lower t ...

Page 6

... PDIP CS3842AGN8 • 8L PDIP CS3842AGD8 • Narrow CS3842AGDR8 • Narrow (tape & reel) CS3842AGD14 • 14L SO Narrow CS3842AGDR14 • 14L SO Narrow (tape & reel) CS2843ALD14 • 14L SO Narrow CS2843ALDR14 • 14L SO Narrow (tape & reel) CS3843AGN8 • 8L PDIP CS3843AGD8 • ...

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