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參數(shù)資料
| 型號(hào)： | IMP38C44EMA |
| 廠商： | IMP INC. |
| 英文描述： | BiCMOS Current-Mode PWM Controllers |
| 中文描述： | 的BiCMOS電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 1/10頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | IMP38C44EMA |
2000 IMP, Inc.
408-432-9100/www.impweb.com
1
IMP38C/HC/42/3/4/5
P
OWER
M
ANAGEMENT
BiCMOS Cur
r
r
PWM Contr
–
–
1MHz Oper
ation
–
–
N
N
o Cr
os
s
s
-
-
Conduction Cur
r
r
–
–
50ns Cur
r
r
ent-Sense Dela
y
y
The IMP38C4x and IMP38HC4x are fixed frequency, high performance,
current-mode PWM controllers that are pin compatible with bipolar 384x
devices but feature improvements resulting from IMP’s BiCMOS
processing and circuit design. Notable among the improvements are zero
cross-conduction/shoot-through current, reduced start-up and operating
current, lower current-sense delay, higher frequency operation, full
supply voltage swing at the output and a 1% trimmed voltage reference.
Key Features
N
384x Series Pinout with BiCMOS Technology
N
Zero Cross-Conduction Current by Design
N
1MHz Operation
N
65ns Maximum Current-Sense Delay
N
120μA Maximum Start-Up Current
N
1.5mA Maximum Operating Current
N
High Output Current Drive
– 1.0A, IMP38HC4x
– 0.5A, IMP38C4x
N
20V Maximum Supply Voltage
N
2.5V, 1%, Trimmed Error Amplifier Reference
N
Trimmed Oscillator Discharge Current
N
Pin-for-Pin Enhanced Replacements for Micrel
MIC38C/HC4x and GMT38C4x/HC4x
Block Diagrams
ent-Mode
oller
s
s
ent
IMP38C4x and IMP38HC4x output driver stage has zero cross-conduction
current. A proprietary output state-machine monitors each output
MOSFET and guarantees by design zero cross-conduction current. This is
an industry first for 384x PWM devices.
Under-voltage lockout (UVL) performance has been improved. When
the power supply voltage is below the startup voltage, internal circuitry
puts the output into a low impedance state. The output will sink 20mA
and remain below 1.3V, well below the turn-on threshold voltage of the
external MOSFET. Even when V
DD
drops to zero volts, the out pin will
not rise above approximately 1.3V because the output UVLO circuit is
+
–
EA
OUT
6 (10)
RTCT
4 (7)
COMP
1 (1)
V
DD
V
REF
5V
Reference
7 (12)
8 (14)
FB
2 (3)
V
D
(11)
–
+
+
–
UVLO
+
–
COMP
PGND
(8)
Oscillator
T
Q
S
Q
R
1V
R
2R
2.5V
Ref
( ) Pins Are 14-Pin Devices Only
38C/HC_01.eps
+
–
GND 5
AGND (9)
3 (5)
ISNS
Connection Notes
IMP38C4X, IMP38HC4X (8-Pin Devices)
50% Maximum Duty Cycle:
IMP38C44, IMP38HC44, IMP38C45, IMP38HC45
96% Maximum Duty Cycle:
IMP38C42, IMP38HC42, IMP38C43, IMP38HC43
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IMP38C44EPA | 制造商:A1PROS 制造商全稱:A1 PROs co., Ltd. 功能描述:BiiCMOS Currentt--Mode BiiCMOS Currentt--Mode |
| IMP38C44EPD | 制造商:IMP 制造商全稱:IMP 功能描述:BiCMOS Current-Mode PWM Controllers |
| IMP38C44ESA | 制造商:A1PROS 制造商全稱:A1 PROs co., Ltd. 功能描述:BiiCMOS Currentt--Mode BiiCMOS Currentt--Mode |
| IMP38C44ESD | 制造商:IMP 制造商全稱:IMP 功能描述:BiCMOS Current-Mode PWM Controllers |
| IMP38C45/D | 制造商:A1PROS 制造商全稱:A1 PROs co., Ltd. 功能描述:BiiCMOS Currentt--Mode BiiCMOS Currentt--Mode |
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