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參數(shù)資料
| 型號(hào)： | CS3842AGDR8 |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDSO8 |
| 封裝： | SO-8 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大小： | 156K |
| 代理商： | CS3842AGDR8 |
1
Features
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
+
–
2.50V
Set/
Reset
Undervoltage
Lock-out Circuit
34V
( ) Indicates CS-2843A/3843A
16V/10V
(8.4V/7.6V)
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 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
Reference
s
High Current Totem Pole
Output
Package Options
CS2842A/3843A
SERIES
Off-Line Current Mode PWM Control
Circuit with Undervoltage Lockout
CS2842A/CS3842A
CS2843A/CS3843A
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, 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
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 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 VREF is stabilized before
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.
A
Company
Rev. 7/9/99
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
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| CS3842AGN8 | 制造商:ON Semiconductor 功能描述: |
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| CS3842B/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Off-Line Current Mode PWM Control Circuit with Very Low Start Up Current |
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