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PDF IMP38C4X Data sheet ( Hoja de datos )

Número de pieza IMP38C4X
Descripción BiCMOS Current-Mode PWM Controllers
Fabricantes IMP Inc 
Logotipo IMP  Inc Logotipo



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IMP38C/HC/42/3/4/5
POWER MANAGEMENT
BiCMOS Current-Mode
PWM Controllers
– 1MHz Operation
– No Cross-Conduction Current
– 50ns Current-Sense Delay
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.
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 VDD drops to zero volts, the out pin will
not rise above approximately 1.3V because the output UVLO circuit is
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
7 (12)
VDD
8 (14)
VREF
RTCT
COMP
FB
4 (7)
1 (1)
2 (3)
EA
+
+
2.5V
Ref
5V
Reference
Oscillator
+
UVLO
+
2R
1V COMP
R+
TQ
SQ
R
(11)
VD
6 (10)
OUT
(8)
PGND
( ) Pins Are 14-Pin Devices Only
3 (5)
GND 5 ISNS
AGND (9)
Connection Notes
IMP38C4X, IMP38HC4X (8-Pin Devices)
50% Maximum Duty Cycle:
IMP38C44, IMP38HC44, IMP38C45, IMP38HC45
96% Maximum Duty Cycle:
IMP38C42, IMP38HC42, IMP38C43, IMP38HC43
© 2000 IMP, Inc.
408-432-9100/www.impweb.com
38C/HC_01.eps
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IMP38C4X pdf
IMP38C/HC/42/3/4/5
Electrical Characteristics
Unless otherwise noted, VCC = 15V, RT = 10kand CT = 3.3nF. Specifications are over the – 40°C to +85°C ambient temperature range.
Bold/blue specifications indicate enhanced performance features.
Parameter
Symbol Conditions
Min Typ Max Units
Current Sense
Gain
AVOL
Notes 1, 2 and 3
2.90 3.00 3.10 V/V
Over Current Protection Threshold
Vcomp = max, Note 2
0.9 0.98 1.1
V
Power Supply Rejection Ratio
Input Bias Current
PSRR
IB
VSTART VCC 18V
70
0.1 2.0
dB
µA
Delay to Output
TPD VFB = 0V, ISNS 0V to 2V, CL = 1nF
50 65 ns
Output
IMP38C4x
ON Resistance, High
ON Resistance, Low
RDS (ON)
ISOURCE = 0.2A
ISINK = 0.2A
20
11
IMP38HC4x
ON Resistance, High
ON Resistance, Low
RDS (ON)
ISOURCE = 0.2A
ISINK = 0.2A
10
5.5
Peak Drive Current
HC devices
1.0 A
H devices
0.5
IMP38C4x Rise Time
IMP38C4x Fall Time
IMP38HC4x Rise Time
IMP38HC4x Fall Time
TR TA = 25°C, CL = 1nF
TF TA = 25°C, CL = 1nF
TR TA = 25°C, CL = 1nF
TF TA = 25°C, CL = 1nF
40 70 ns
30 50 ns
20 50 ns
15 40 ns
Shoot-through Current
0 mA
Undervoltage Lockout
Start Threshold
IMP38C42/4, IMP38HC42/4
13.5 14.5 15.5
V
IMP38C43/5, IMP38HC43/5
7.8 8.4 9.0
Minimum Operating Voltage
IMP38C42/4, IMP38HC42/4
8 9 10 V
IMP38C43/5, IMP38HC43/5
7.0 7.6 8.2
Pulse Width Modulator
Maximum Duty Cycle
IMP38C42/3, IMP38HC42/3,
94 96
%
Maximum Duty Cycle
IMP38C44/5, IMP38HC44/5
48 50
%
Minimum Duty Cycle
0%
Supply Current
Start-Up Current
VCC = 13V for IMP38C42/44, IMP38HC42/44
VCC = 7.5V for IMP38C43/45, IMP38HC43/45
95 120 µA
Operating Current
ICC VFB = VIS = 0
0.5 1.5 mA
Note 1. Guaranteed by design. Not 100% tested in production.
Note 2. Measured at trip point of VFB = 0V.
Note 3. Gain is defined as:
A
=
VCOMP
VCS
,
0
VCS
0.8V
Note 4. Adjust VCC above the start threshold before setting at 15V.
Note 5. Output frequency equals the oscillator frequency for
IMP38C42/3 and IMP38HC42/3 devices. Output frequency
equals one-half the oscillator frequency for IMP38C44/5 and
IMP38HC44/5 devices.
Table 1. Startup and Operating Voltage Selection Guide
Duty Cycle
0% to 96%
0% to 50%
UVLO Thresholds
Start-up at 8.4V
Operating Minimum = 7.6V
Start-up at 14.5V
Operating Minimum = 9.0V
IMP38C43/HC43
IMP38C42/HC42
IMP38C45/HC45
IMP38C44/HC44
38C/HC_t03.eps
© 2000 IMP, Inc.
PWM Controllers
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