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参数资料
| 型号： | CS2845LDWR16 |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 1/6页 |
| 文件大小： | 157K |
| 代理商： | CS2845LDWR16 |
1
Features
VCC
Gnd
COMP
OSC
Sense
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
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
CS2844/3845
SERIES
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) ................................................................................5J
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
10
9
1
2
3
4
5
6
7
8
NC
COMP
VFB
SENSE
OSC
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. 6/23/99
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