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CS3845GDR14 Arkusz danych(PDF) 1 Page - Cherry Semiconductor Corporation

Numer części CS3845GDR14
Szczegółowy opis  Current Mode PWM Control Circuit with 50% Max Duty Cycle
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Producent  CHERRY [Cherry Semiconductor Corporation]
Strona internetowa  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS3845GDR14 Arkusz danych(HTML) 1 Page - Cherry Semiconductor Corporation

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1
Features
VCC
Gnd
COMP
OSC
Sense
VREF
VREF
Undervoltage
Lockout
Internal
Bias
NOR
S
R
PWM
Latch
Current
Sensing
Comparator
R
2 R
1V
Error
Amplifier
-
+
2.50V
Set/
Reset
VCC Undervoltage Lock-out
34V
16V/10V
(8.4V/7.6V)
R
R
VFB
VCC Pwr
VOUT
Pwr Gnd
Oscillator
Toggle
Flip-Flop
5.0 Volt
Reference
( ) indicates CS-2845/3845
s
Optimized for Offline
Control
s
Temp. Compensated
Oscillator
s
50% Max Duty-cycle Clamp
s
VREF Stabilized before
Output Stage is Enabled
s
Low Start-up Current
s
Pulse-by-pulse Current
Limiting
s
Improved Undervoltage
Lockout
s
Double Pulse Suppression
s
1% Trimmed Bandgap Ref.
s
High Current Totem Pole
Output
Package Options
Current Mode PWM Control Circuit
with 50% Max Duty Cycle
CS2844/CS3844
CS2845/CS3845
Description
Block Diagram
Absolute Maximum Ratings
Supply Voltage (ICC<30mA).........................................................................Self Limiting
Supply Voltage (Low Impedance Source) .................................................................30V
Output Current..............................................................................................................±1A
Output Energy (Capacitive Load) ................................................................................5µJ
Analog Inputs (VFB, VSENSE) .........................................................................-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
1
COMP
2
3
4
VFB
Sense
OSC
VREF
VCC
VOUT
Gnd
8
7
6
5
8 Lead PDIP & SO Narrow
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
The CS3844/45 provides all the neces-
sary features to implement off-line
fixed frequency current-mode control
with a minimum number of external
components.
The CS3844 family incorporates a new
precision temperature-controlled oscil-
lator to minimize variations in fre-
quency. An internal toggle flip-flop,
which blanks the output every other
clock cycle, limits the duty-cycle range
to less than 50%. An undervoltage
lockout ensures that VREF is stabilized
before the output stage is enabled. In
the CS2844/CS3844 turn on occurs at
16V and turn off at 10V. In the
CS2845/CS3845 turn on is at 8.4V and
turn off at 7.6V.
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 gate of a power MOSFET. The out-
put is low in the off state, consistent
with N-channel devices.
16
15
14
13
12
11
11
10
9
1
2
3
4
5
6
7
8
NC
NC
COMP
VFB
SENSE
OSC
NC
NC
NC
VREF
VCC
VCCPwr
VO
Gnd
Pwr Gnd
NC
16 Lead SO Wide
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
®
Rev. 3/17/99


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