®
ISL8840AMBEPZ, ISL8841AMBEPZ, ISL8842AMBEPZ,
ISL8843AMBEPZ, ISL8844AMBEPZ, ISL8845AMBEPZ
Data Sheet
September 29, 2008
FN6792.0
High Performance Industry Standard
Single-Ended Current Mode PWM
Controller
The ISL884xAMBEPZ is a high performance drop-in
replacement for the popular 28C4x and 18C4x PWM
controllers suitable for a wide range of power conversion
applications including boost, flyback, and isolated output
configurations. Its fast signal propagation and output
switching characteristics make this an ideal product for
existing and new designs.
Features include 30V operation, low operating current, 90µA
start-up current, adjustable operating frequency to 2MHz,
and high peak current drive capability with 20ns rise and fall
times.
PART NUMBER
ISL8840AMBEPZ
ISL8841AMBEPZ
ISL8842AMBEPZ
ISL8843AMBEPZ
ISL8844AMBEPZ
ISL8845AMBEPZ
RISING UVLO
(V)
7.0
7.0
14.4
8.4
14.4
8.4
MAX. DUTY CYCLE
(%)
100
50
100
100
50
50
Features
• Full Mil-Temp Electrical Performance from -55°C to +125°C
• Controlled Baseline with One Wafer Fabrication Site and
One Assembly/Test Site
• Full Homogenous Lot Processing in Wafer Fab
• No Combination of Wafer Fabrication Lots in Assembly
• Full Traceability Through Assembly and Test by
Date/Trace Code Assignment
• Enhanced Process Change Notification
• Enhanced Obsolescence Management
• Eliminates Need for Up-Screening a COTS Component
• 1A MOSFET Gate Driver
• 90µA Start-up Current, 125µA Maximum
• 35ns Propagation Delay Current Sense to Output
• Fast Transient Response with Peak Current Mode Control
• 30V Operation
• Adjustable Switching Frequency to 2MHz
• 20ns Rise and Fall Times with 1nF Output Load
• Trimmed Timing Capacitor Discharge Current for Accurate
Deadtime/Maximum Duty Cycle Control
• 1.5MHz Bandwidth Error Amplifier
Pinout
ISL884XAMBEPZ
(8 LD SOIC)
TOP VIEW
COMP 1
FB 2
CS 3
RTCT 4
8 VREF
7 VDD
6 OUT
5 GND
• Tight Tolerance Voltage Reference Over Line, Load and
Temperature
• ±3% Current Limit Threshold
• Pb-Free (RoHS
Compliant)
Applications
• Isolated Flyback and Forward Regulators
• Boost Regulators
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL8840AMBEPZ, ISL8841AMBEPZ, ISL8842AMBEPZ, ISL8843AMBEPZ, ISL8844AMBEPZ, ISL8845AMBEPZ
Ordering Information
PART NUMBER
(Notes 1, 2)
ISL8840AMBEPZ
ISL8841AMBEPZ
ISL8842AMBEPZ
ISL8843AMBEPZ
ISL8844AMBEPZ
ISL8845AMBEPZ
NOTES:
1. Add “-TK” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-
020.
PART
MARKING
8840A MBEPZ
8841A MBEPZ
8842A MBEPZ
8843A MBEPZ
8844A MBEPZ
8845A MBEPZ
TEMP RANGE
(°C)
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
-55 to +125
PACKAGE
(Pb-Free)
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
PKG.
DWG. #
M8.15
M8.15
M8.15
M8.15
M8.15
M8.15
2
FN6792.0
September 29, 2008
Functional Block Diagram
VDD
VREF
5.00V
ENABLE
VREF FAULT
-
+
VREF
UV COMPARATOR
A
4.65V
4.80V
+
-
VREF
START/STOP
UV COMPARATOR
VDD OK
+
-
+
-
ISL8840AMBEPZ, ISL8841AMBEPZ, ISL8842AMBEPZ, ISL8843AMBEPZ, ISL8844AMBEPZ, ISL8845AMBEPZ
3
PWM
COMPARATOR
+
-
100mV
+
-
2R
1.1V
CLAMP
R
Q
T
Q
OUT
S Q
36k
R Q
RESET
DOMINANT
ONLY
ISL8841AMBEPZ/
ISL8844AMBEPZ/
ISL8845AMBEPZ
ON
CLOCK
GND
2.5V
A = 0.5
CS
FB
+
-
ERROR
AMPLIFIER
VF TOTAL = 1.15V
COMP
VREF
100k
2.9V
1.0V
150k
OSCILLATOR
COMPARATOR
<10ns
RTCT
-
+
8.4mA
FN6792.0
September 29, 2008
ON
ISL8840AMBEPZ, ISL8841AMBEPZ, ISL8842AMBEPZ, ISL8843AMBEPZ, ISL8844AMBEPZ, ISL8845AMBEPZ
Absolute Maximum Ratings
Supply Voltage, V
DD
. . . . . . . . . . . . . . . . . . . . . GND -0.3V to +30V
OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to V
DD
+ 0.3V
Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to 6.0V
Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1A
Thermal Information
Thermal Resistance (Note 4)
θ
JA
(°C/W)
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
100
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Supply Voltage Range (Note 3) . . . . . . . . . . . . . . . . . . . . . 9V to 30V
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . .-55°C to +125°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
3. All voltages are with respect to GND.
4.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Technical Brief TB379 for details.
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 3.
V
DD
= 15V, R
t
= 10kΩ, C
t
= 3.3nF,
T
A
= -55 to +125°C,
Typical values are at T
A
= +25°C. Parameters with MIN
and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
UNDERVOLTAGE LOCKOUT
START Threshold (ISL8840AMBEPZ,
ISL8841AMBEPZ)
START Threshold (ISL8843AMBEPZ,
ISL8845AMBEPZ)
START Threshold (ISL8842AMBEPZ,
ISL8844AMBEPZ)
STOP Threshold (ISL8840AMBEPZ,
ISL8841AMBEPZ)
STOP Threshold (ISL8843AMBEPZ,
ISL8845AMBEPZ)
STOP Threshold (ISL8842AMBEPZ,
ISL8844AMBEPZ)
Hysteresis (ISL8840AMBEPZ, ISL8841AMBEPZ)
Hysteresis (ISL8843AMBEPZ, ISL8845AMBEPZ)
Hysteresis (ISL8842AMBEPZ, ISL8844AMBEPZ)
Start-up Current, I
DD
Operating Current, I
DD
Operating Supply Current, I
D
REFERENCE VOLTAGE
Overall Accuracy
Long Term Stability
Current Limit, Sourcing
Current Limit, Sinking
CURRENT SENSE
Input Bias Current
CS Offset Voltage
COMP to PWM Comparator Offset Voltage
Input Signal, Maximum
6.5
8.0
(Note 7)
13.3
6.1
7.3
8.0
-
-
-
V
DD
< START Threshold
(Note 5)
Includes 1nF GATE loading
-
-
-
7.0
8.4
14.3
6.6
7.6
8.8
0.4
0.8
5.4
90
2.9
4.75
7.5
9.0
15.3
6.9
8.0
9.6
-
-
-
125
4.0
5.5
V
V
V
V
V
V
V
V
V
µA
mA
mA
Over line (V
DD
= 12V to 30V), load,
temperature
T
A
= +125°C, 1000 hours (Note 6)
4.900
-
-20
5
5.000
5
-
-
5.050
-
-
-
V
mV
mA
mA
V
CS
= 1V
V
CS
= 0V (Note 6)
V
CS
= 0V (Note 6)
-1.0
95
0.80
0.97
-
100
1.15
1.00
1.0
105
1.30
1.03
µA
mV
V
V
4
FN6792.0
September 29, 2008
ISL8840AMBEPZ, ISL8841AMBEPZ, ISL8842AMBEPZ, ISL8843AMBEPZ, ISL8844AMBEPZ, ISL8845AMBEPZ
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 3.
V
DD
= 15V, R
t
= 10kΩ, C
t
= 3.3nF,
T
A
= -55 to +125°C,
Typical values are at T
A
= +25°C. Parameters with MIN
and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested
(Continued)
TEST CONDITIONS
0 < V
CS
< 910mV, V
FB
= 0V
MIN
2.5
-
TYP
3.0
35
MAX
3.5
60
UNITS
V/V
ns
PARAMETER
Gain, A
CS
=
ΔV
COMP
/ΔV
CS
CS to OUT Delay
ERROR AMPLIFIER
Open Loop Voltage Gain
Unity Gain Bandwidth
Reference Voltage
FB Input Bias Current
COMP Sink Current
COMP Source Current
COMP VOH
COMP VOL
PSRR
OSCILLATOR
Frequency Accuracy
Frequency Variation with V
DD
Temperature Stability
Amplitude, Peak-to-Peak
RTCT Discharge Voltage (Valley Voltage)
Discharge Current
OUTPUT
Gate VOH
Gate VOL
Peak Output Current
Rise Time
Fall Time
GATE VOL UVLO Clamp Voltage
PWM
Maximum Duty Cycle
(ISL8840AMBEPZ, ISL8842AMBEPZ,
ISL8843AMBEPZ)
Maximum Duty Cycle
(ISL8841AMBEPZ, ISL8844AMBEPZ,
ISL8845AMBEPZ)
Minimum Duty Cycle
NOTES:
(Note 6)
(Note 6)
V
FB
= V
COMP
V
FB
= 0V
V
COMP
= 1.5V, V
FB
= 2.7V
V
COMP
= 1.5V, V
FB
= 2.3V
V
FB
= 2.3V
V
FB
= 2.7V
Frequency = 120Hz, V
DD
= 12V to
30V (Note 6)
60
1.0
2.460
-1.0
1.0
-0.4
4.80
0.4
60
90
1.5
2.500
-0.2
-
-
-
-
80
-
-
2.535
1.0
-
-
VREF
1.0
-
dB
MHz
V
µA
mA
mA
V
V
dB
Initial, T
A
= +25°C
T
A
= +25°C, (f
30V
- f
10V
)/f
30V
(Note 6)
Static Test
Static Test
RTCT = 2.0V
48
-
-
-
-
6.2
51
0.2
-
1.75
1.0
8.0
53
1.0
5
-
-
8.5
kHz
%
%
V
V
mA
V
DD
- OUT, I
OUT
= -200mA
OUT - GND, I
OUT
= 200mA
C
OUT
= 1nF (Note 6)
C
OUT
= 1nF (Note 6)
C
OUT
= 1nF (Note 6)
V
DD
= 5V, I
LOAD
= 1mA
COMP = VREF
-
-
-
-
-
-
1.0
1.0
1.0
20
20
-
2.0
2.0
-
40
40
1.2
V
V
A
ns
ns
V
94.0
96.0
-
%
COMP = VREF
47.0
48.0
-
%
COMP = GND
-
-
0
%
5. This is the V
DD
current consumed when the device is active but not switching. Does not include gate drive current.
6. Limits established by characterization and are not production tested.
7. Adjust V
DD
above the start threshold and then lower to 15V.
5
FN6792.0
September 29, 2008
电源技术
