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AP3843 Datasheet Preview

AP3843 Datasheet

(AP3842 - AP3845) High Performance Current Mode PWM Controller

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High Performance Current Mode PWM Controller
AP3842/3/4/5
„ Features
Optimized for Off-Line and DC to DC Converters
Low Start-Up Current (0.5mA)
Automatic Feed Forward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Under-Voltage Lockout (UVLO) with Hysteresis
Double Pulse Suppression
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
Current Mode Operation to 500KHZ
Low Ro Error Amplifier
„ Pin Connections
PDIP-8L, SOP-8L
Top View
COMP. 1
VFB 2
ISENSE 3
RT/CT 4
8 VREF
7 VI
6 OUTPUT
5 GROUND
„ General Description
The AP3842/3/4/5 family of control ICs provides the
necessary features to implement off-line or DC to
DC fixed frequency current mode control schemes
with a minimal external parts count. Internally
implemented circuits include under voltage lockout
featuring start-up current less than 0.5 mA, a
precision reference trimmed for accuracy at the
error amp input, logic to insure latched operation, a
PWM comparator which also provides current limit
control, and a totem pole output stage designed to
source or sink high peak current. The output stage,
suitable for driving N-Channel MOSFETs, is low in
the off-state.
Differences between members of this family are the
under-voltage lockout thresholds and maximum
duty cycle ranges. The AP3842 and AP3844 have
UVLO thresholds of 16V(on) and 10V(off), ideally
suited for off-line applications. The corresponding
thresholds for the AP3843 and AP3845 are 8.5V
and 7.6V. The AP3842 and AP3843 can operate to
duty cycles approaching 100%. A range of the zero
to < 50% is obtained by the AP3844 and AP3845
by the addition of an internal toggle flip flop which
blanks the output off every other clock cycle.
„ Ordering Information
AP 384X X X X
Part No.
2:3842
3:3843
4:3844
5:3845
Package
Lead Free
Packing
S8:SOP-8L Blank : Normal
Blank: Tube
N8:PDIP-8L L : Lead Free Package A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0 Oct.11, 2004
1/8
DataSheet4 U .com



Anachip
Anachip

AP3843 Datasheet Preview

AP3843 Datasheet

(AP3842 - AP3845) High Performance Current Mode PWM Controller

No Preview Available !

AP3843 pdf
www.DataSheet4U.com
High Performance Current Mode PWM Controller
AP3842/3/4/5
„ Block Diagram ( toggle flip flop used only in AP3844 and AP3845 )
7
Vi
GROUND
5
RT/CT
4
VFB
COMP
CURRENT
SENSE
2
1
3
36V
16V
UVLO
S/R
5V
REF
2.50V
VREF GOOD
LOGIC
INTERNAL
BIAS
OSC.
ERROR AMP.
2R
R
T
S
R
1V CURRENT
SENSE
COMPARATOR
PWM
LATCH
„ Absolute Maximum Ratings
8 VREF
5V 50mA
6
OUTPUT
AP384X
Symbol
Parameter
Value
Vi Supply Voltage (low impedance source)
Vi Supply Voltage (li < 30mA)
Io Output Current
Eo Output Energy (capacitive load)
Analog Inputs (pins2,3)
36
Self Limiting
±0.7
5
-0.3 to 5.5
Error Amplifier Output Sink Current
10
Ptot Power Dissipation at Tamb 500C (PDIP8)
Ptot Power Dissipation at Tamb 250C (SOP8)
1.25
800
Tstg Storage Temperature Range
-65 to 150
TL Lead Temperature (soldering 10s)
260
*Notes: 1. All voltages are with respect to pin 5, all currents are positive into the specified terminal.
Unit
V
A
µJ
V
mA
W
mW
oC
oC
„ Electrical Characteristics
(Unless otherwise stated, these specifications apply for 0Tamb70oC for AP384X ; Vi = 15V(note 5); RT = 10K;CT = 3.3nF)
Symbol
Parameter
Test Conditions
AP384X
Min. Typ. Max.
Unit
REFERENCE SECTION
VREF
Output Voltage
Tj = 250C I0=1mA
VREF
Line Regulation
12VVi25V
VREF
Load Regulation
1mAIo20mA
VREF/T
Temperature Stability
(Notes 2)
Total Output Variation Line, Load, Temperature (Notes 2)
eN
Output Noise Voltage
10Hzf10KHz Tj=250C (Notes
2)
Long Term Stability
Tamb=1250C, 1000Hrs (Notes 2)
ISC Output Short Circuit current
4.90
4.82
5.00
2
3
0.2
50
5
-85
5.10
20
25
0.4
5.18
25
-120
V
mV
mV
mV/0C
V
µV
mV
mA
Anachip Corp.
www.anachip.com.tw
DataSheet4 U .com
Rev.1.0 Oct.11, 2004
2/8


Part Number AP3843
Description (AP3842 - AP3845) High Performance Current Mode PWM Controller
Maker Anachip
Total Page 8 Pages
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