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ISL78841ASRH の電気的特性と機能

ISL78841ASRHのメーカーはIntersilです、この部品の機能は「High Performance Industry Standard Single-Ended Current Mode PWM Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL78841ASRH
部品説明 High Performance Industry Standard Single-Ended Current Mode PWM Controller
メーカ Intersil
ロゴ Intersil ロゴ 




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ISL78841ASRH Datasheet, ISL78841ASRH PDF,ピン配置, 機能
DATASHEET
Radiation Hardened, High Performance Industry
Standard Single-Ended Current Mode PWM Controller
ISL78840ASEH, ISL78841ASEH, ISL78843ASEH, ISL78845ASEH
ISL78840ASRH, ISL78841ASRH, ISL78843ASRH, ISL78845ASRH
The ISL78840ASEH, ISL78841ASEH, ISL78843ASEH,
ISL78845ASEH, ISL78840ASRH, ISL78841ASRH,
ISL78843ASRH, ISL78845ASRH are a high performance,
radiation hardened 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 up to 13.2V operation, low operating current,
90µA typical start-up current, adjustable operating frequency
to 1MHz and high peak current drive capability with 50ns rise
and fall times.
Features
• Electrically screened to DLA SMD #5962-07249
• QML Qualified Per MIL-PRF-38535 Requirements
• 1A MOSFET Gate Driver
• 90µA typical start-up current, 125µA Maximum
• 35ns propagation delay current sense to output
• Fast transient response with peak current mode control
• 9V to 13.2V operation
• Adjustable switching frequency to 1MHz
• 50ns rise and fall times with 1nF output load
Applications
• Current mode switching power supplies
• Isolated buck and flyback regulators
• Boost regulators
• Trimmed timing capacitor discharge current for accurate
deadtime/maximum duty cycle control
• 1.5MHz bandwidth error amplifier
• Tight tolerance voltage reference over line, load and
temperature
• Direction and speed control in motors
• ±3% current limit threshold
• Control of high current FET drivers
• Pb-free available (RoHS compliant)
Related Literature
TR005, “Single Event Effects (SEE) Test Report for
ISL78843ASRH and ISL78845ASRH High Performance
Single-ended Current Mode PWM Controllers”
TR006, “Neutron Testing of the ISL78845ASEH Pulse Width
Modulator”
• Radiation environment:
- High dose rate (50 - 300rad(Si)/s). . . . . . . . . . 100krad(Si)
- Low dose rate (0.01rad(Si)/s) . . . . . . . . . . . . 100krad(Si)*
* Product capability established by initial characterization. The
“EH” version is acceptance tested on a wafer by wafer basis to
50krad(Si) at low dose rate. (Applies for ISL7884xASEH only)
Pin Configurations
ISL78840ASEH, ISL78841ASEH,
ISL78843ASEH, ISL78845ASEH ISL78840ASRH,
ISL78841ASRH, ISL78843ASRH, ISL78845ASRH
(8 LD FLATPACK)
TOP VIEW
COMP
FB
CS
RTCT
18
27
36
45
VREF
VDD
OUT
GND
ISL78840ASEH, ISL78841ASEH,
ISL78843ASEH, ISL78845ASEH ISL78840ASRH,
ISL78841ASRH, ISL78843ASRH, ISL78845ASRH
(8 LD SBDIP)
TOP VIEW
COMP 1
FB 2
CS 3
RTCT 4
8 VREF
7 VDD
6 OUT
5 GND
April 8, 2016
FN7952.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2012, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL78841ASRH pdf, ピン配列
ISL78840ASEH, ISL78841ASEH, ISL78843ASEH, ISL78845ASEH ISL78840ASRH, ISL78841ASRH, ISL78843ASRH, ISL78845ASRH
Ordering Information (Continued)
ORDERING NUMBER
(Note 1)
PART NUMBER
(Note 2)
TEMP. RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG. DWG. #
5962R0724904VPC
ISL78845ASRHVD
-55 to +125
8 Ld SBDIP
D8.3
NOTES:
1. These Intersil Pb-free Hermetic packaged products employ 100% Au plate - e4 termination finish, which is RoHS compliant and compatible with both
SnPb and Pb-free soldering operations.
2. Specifications for Rad Hard QML devices are controlled by the Defense Logistics Agency Land and Maritime (DLA). The SMD numbers listed in the
“Ordering Information” table must be used when ordering.
PART NUMBER
ISL78840ASxH
ISL78841ASxH
ISL78843ASxH
ISL78845ASxH
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
RISING UVLO
(V)
7.0
7.0
8.4
8.4
MAXIMUM DUTY CYCLE
(%)
100
50
100
50
Pin Descriptions
PIN NAME
RTCT
PIN NUMBER
4
COMP
FB
CS
GND
OUT
1
2
3
5
6
Submit Document Feedback
3
DESCRIPTION
This is the oscillator timing control pin. The operational frequency and maximum
duty cycle are set by connecting a resistor, RT, between VREF and this pin and a
timing capacitor, CT, from this pin to GND. The oscillator produces a sawtooth
waveform with a programmable frequency range up to 2.0MHz. The charge time, tC,
the discharge time, tD, the RTCT oscillator frequency, f and the maximum duty cycle,
DMAX, can be approximated from Equations 1 through 4:
tC 0.533 RT CT
(EQ. 1)
tD
R
T
C
T
I
n
00----..--00---00---88--------RR-----TT-----––-----31---..--87---31--
(EQ. 2)
f = 1  tC + tD
(EQ. 3)
D = tC f
(EQ. 4)
The formulas have increased error at higher frequencies due to propagation delays.
Figure 7 may be used as a guideline in selecting the capacitor and resistor values
required for a given oscillator frequency for the ISL7884xASxH. The switching
frequency for the ISL78841ASxH and ISL78845ASxH will be half the RTCT oscillator
frequency.
COMP is the output of the error amplifier and the input of the PWM comparator. The
control loop frequency compensation network is connected between the COMP and
FB pins.
The output voltage feedback is connected to the inverting input of the error amplifier
through this pin. The noninverting input of the error amplifier is internally tied to a
reference voltage.
This is the current sense input to the PWM comparator. The range of the input signal
is nominally 0V to 1.0V and has an internal offset of 100mV.
GND is the power and small signal reference ground for all functions.
This is the drive output to the power switching device. It is a high current output
capable of driving the gate of a power MOSFET with peak currents of 1.0A. This GATE
output is actively held low when VDD is below the UVLO threshold.
FN7952.1
April 8, 2016


3Pages


ISL78841ASRH 電子部品, 半導体
Typical Application - 48V Input Dual Output Flyback
VIN+
36V TO 75V
C1
R3 C4
C2
R1
CR6
C3
Q1
C5
CR5
T1
C21 + C15
R21
CR2
CR4
+
C22
C17 C19
+
C20
C6 R16 R17
U2 R19
+3.3V
+ C16
+1.8V
RETURN
R18
C14
VIN-
R6
Q3
VR1
R4 R28
R22
R27
CR1
U4
R26
COMP VREF
CS VDD
FB OUT
RTCT GND
ISL7884xASxH
R10
C8
C13 R15
U3
R20
C12
C11
R13
FIGURE 2. TYPICAL APPLICATION - 48V INPUT DUAL OUTPUT FLYBACK

6 Page



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部品番号部品説明メーカ
ISL78841ASRH

High Performance Industry Standard Single-Ended Current Mode PWM Controller

Intersil
Intersil


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