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參數資料
| 型號： | CS2844LDR14 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Current Mode PWM Control Circuit with 50% Max Duty Cycle |
| 中文描述： | 電流模式PWM控制電路的最大占空比為50％ |
| 文件頁數： | 1/6頁 |
| 文件大小： | 156K |
| 代理商： | CS2844LDR14 |
1
Features
V
CC
Gnd
COMP
OSC
Sense
V
REF
REF
UndV
Lockout
Internal
Bias
NOR
S
R
PWM
Latch
Current
CSensing
R
2 R
1V
Error
Amplifier
-
+
2.50V
Set/
V
CC
Undervoltage Lock-out
34V
(16V/10V
R
R
V
FB
V
CC
Pwr
V
OUT
Pwr Gnd
Oscillator
FToggle
5.0 Volt
( ) indicates CS-2845/3845
I
Optimized for Offline
Control
Temp. Compensated
Oscillator
50% Max Duty-cycle Clamp
V
REF
Stabilized before
Output Stage is Enabled
Low Start-up Current
Pulse-by-pulse Current
Limiting
Improved Undervoltage
Lockout
Double Pulse Suppression
1% Trimmed Bandgap Ref.
High Current Totem Pole
Output
Package Options
I
I
I
I
I
I
I
I
I
C
Current Mode PWM Control Circuit
with 50% Max Duty Cycle
Description
CS2844/CS3844
CS2845/CS3845
Block Diagram
Absolute Maximum Ratings
Supply Voltage (I
CC
<30mA).........................................................................Self Limiting
Supply Voltage (Low Impedance Source) .................................................................30V
Output Current..............................................................................................................±1A
Output Energy (Capacitive Load)................................................................................5μJ
Analog Inputs (V
FB
, V
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
1
COMP
2
3
4
V
FB
Sense
OSC
V
REF
V
CC
V
OUT
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
V
FB
NC
Sense
NC
OSC
V
REF
NC
V
CC
V
CC
Pwr
V
OUT
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 V
REF
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
NC
COMP
V
FB
SENSE
OSC
NC
NC
NC
V
REF
V
CC
V
CCPwr
V
O
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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