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CS2841BEN8 Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation

Part # CS2841BEN8
Description  Automotive Current Mode PWM Control Circuit
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Manufacturer  CHERRY [Cherry Semiconductor Corporation]
Direct Link  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS2841BEN8 Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation

  CS2841BEN8 Datasheet HTML 1Page - Cherry Semiconductor Corporation CS2841BEN8 Datasheet HTML 2Page - Cherry Semiconductor Corporation CS2841BEN8 Datasheet HTML 3Page - Cherry Semiconductor Corporation CS2841BEN8 Datasheet HTML 4Page - Cherry Semiconductor Corporation CS2841BEN8 Datasheet HTML 5Page - Cherry Semiconductor Corporation CS2841BEN8 Datasheet HTML 6Page - Cherry Semiconductor Corporation  
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1
1
COMP
2
3
4
VFB
Sense
OSC
VREF
VCC
VOUT
Gnd
8
7
6
5
VCC
Gnd
OSC
VFB
COMP
Sense
VREF
VOUT
Output
Enable
5V
Reference
Internal
Bias
NOR
S
R
PWM
Latch
Current
Sensing
Comparator
Oscillator
1 V
R
2 R
VC
Error
Amplifier
+
8.0V/7.4V
2.50V
Set/
Reset
Undervoltage
Lock-out Circuit
VCC Pwr
Pwr Gnd
s
Optimized for Off-line
Control
s
Internally Trimmed
Temperature
Compensated Oscillator
s
Maximum Duty-cycle
Clamp
s
VREF Stabilized before
Output Stage Enabled
s
Low Start-up Current
s
Pulse-by-pulse Current
Limiting
s
Improved Undervoltage
Lockout
s
Double Pulse Suppression
s
1% Trimmed Bandgap
Reference
s
High Current Totem Pole
Output
Package Options
8 Lead PDIP
10
7
14
13
12
8
1
2
3
4
5
6
11
9
COMP
NC
VFB
NC
Sense
NC
OSC
VREF
NC
VCC
VCC Pwr
VOUT
Pwr Gnd
Gnd
14 Lead SO Narrow
Automotive Current Mode PWM
Control Circuit
CS2841B
Description
The CS2841B provides all the nec-
essary features to implement off-
line fixed frequency current-mode
control with a minimum number of
external components.
The CS2841B (a variation of the
CS-2843A) is designed specifically
for use in automotive operation.
The low start threshold voltage of
8.0V (typ), and the ability to sur-
vive 40V automotive load dump
transients are important for auto-
motive subsystem designs. The
CS-2841 series has a history of
quality and reliability in automo-
tive applications.
The CS2841B incorporates a preci-
sion temperature-controlled oscil-
lator with an internally trimmed
discharge current to minimize vari-
ations in frequency. Duty-cycles
greater than 50% are also possible.
On board logic ensures that VREF is
stabilized before the output stage
is enabled. Ion implant resistors
provide tighter control of under-
voltage lockout.
Block Diagram
Absolute Maximum Ratings
Supply Voltage (Low Impedance Source)...................................................40V
Output Current ...............................................................................................±1A
Output Energy (Capacitive Load) .................................................................5µJ
Analog Inputs (VFB, Sense) ............................................................-0.3V to 5.5V
Error Amp Output Sink Current...............................................................10mA
Lead Temperature Soldering
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
Features
Rev. 6/23/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A
Company
®


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