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IMP38C/HC/42/3/4/5
POWER MANAGEMENT
BiCMOS Current-Mode PWM Controllers
Key Features
N N N N N N N N N N N 384x Series Pinout with BiCMOS Technology Zero Cross-Conduction Current by Design 1MHz Operation 65ns Maximum Current-Sense Delay 120A Maximum Start-Up Current 1.5mA Maximum Operating Current High Output Current Drive - 1.0A, IMP38HC4x - 0.5A, IMP38C4x 20V Maximum Supply Voltage 2.5V, 1%, Trimmed Error Amplifier Reference Trimmed Oscillator Discharge Current Pin-for-Pin Enhanced Replacements for Micrel MIC38C/HC4x and GMT38C4x/HC4x
- 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
Block Diagrams
VDD 7 (12) (11) VD
+
VREF 8 (14) 5V Reference UVLO
- + -
RTCT COMP FB 4 (7) 1 (1) T 2 (3) Q Oscillator 6 (10) OUT
-
EA
2R
-
1V R COMP
S R
Q
+ + -
2.5V Ref
+
(8) PGND
(
) Pins Are 14-Pin Devices Only 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
38C/HC_01.eps
(c) 2000 IMP, Inc.
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1
IMP38C/HC/42/3/4/5
powered through the out pin. Leakage current from the external power MOSFETs will not force the PWM output to rise and turn the external MOSFETs on. Current-sense propagation delay time is 35ns typical, 65ns maximum, representing an up to 75 percent reduction over other 38xx implementations. Output stage drive is 0.5A for IMP38C4x devices. The high-drive IMP38HC4x family is rated at 1.0A peak current drive. Like conventional 384x controllers, the IMP38C4x and IMP38HC4x controllers use the current-mode architecture for superior load regulation, pulse-by-pulse current limiting and output MOSFET protection. All versions operate up to 20 volts. For maximum application flexibility, start-up voltage ranges from 14.5V to 8.4V. Start-up current has been reduced to 120A maximum and operating current has been reduced to 1.5mA maximum. The IMP38C4x/IMP38HC4x are available in 8-pin and 14-pin DIP and SO packages as well as the 8-pin MicroSO package. The 14pin devices provide separate pins for the controller power supply and the output driver supply. This configuration maximizes application flexibility and performance. The 14-pin package can also dissipate more power. Devices in the compact 8-pin packages do not have separate output drive supply connections. The IMP38C4x and IMP38HC4x families operate over the -40C to +85C temperature range.
Pin Configuration
SO/MicroSO/DIP
COMP 1 FB 2 ISNS 3 RT/CT 4 IMP38C4x IMP38HC4x 8 VREF 7 VDD 6 OUT 5 GND
38C/HC_02.eps
SO/DIP
COMP 1 NC 2 FB 3 NC 4 ISNS 5 NC 6 RT/CT 7 14 VREF 13 NC IMP38C4x 12 VDD IMP38HC4x 11 V D 10 OUT 9 AGND 8 PGND
38C/HC_03.eps
Pin Descriptions
Pin Number 8-Pin Package
1 2 3 4
14-Pin Package
1 3 5 7
Name
COMP FB ISNS RT/CT
Function
Output of the Error amplifier and input to the PWM comparator. Inverting input of the Error Amplifier. Current sense comparator input. It is internally limited to 1V. Oscillator RC timing component connection. Resistor RT is connected to VREF and capacitor CT is connected to ground. Different values of RT and CT determine the maximum duty cycle. Combined power and analog ground for 8-pin packaged devices and power ground for 14-pin package. High-power, totem-pole driver output. OUT pin is actively held LOW when VCC is below the UVLO threshold. Supply voltage input. 5V-reference voltage output. Analog ground connection for 14-pin package. Output driver supply voltage for 14-pin package. No internal connection.
38C-HC_t01.eps
5 6 7 8
8 10 12 14 9 11 2, 4, 6, 13
GND/PGND OUT VDD VREF AGND VD NC
2
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IMP38C/HC/42/3/4/5
Ordering Information
IMP Ordering Part Number
IMP38C42EPA IMP38C42EPD IMP38C42ESA IMP38C42ESD IMP38C42EMA IMP38C42/D IMP38C43EPA IMP38C43EPD IMP38C43ESA IMP38C43ESD IMP38C43EMA IMP38C43/D IMP38C44EPA IMP38C44EPD IMP38C44ESA IMP38C44ESD IMP38C44EMA IMP38C44/D IMP38C45EPA IMP38C45EPD IMP38C45ESA IMP38C45ESD IMP38C45EMA IMP38C45/D IMP38HC42EPA IMP38HC42EPD IMP38HC42ESA IMP38HC42ESD IMP38HC42EMA IMP38HC42/D IMP38HC43EPA IMP38HC43EPD IMP38HC43ESA IMP38HC43ESD IMP38HC43EMA IMP38HC43/D IMP38HC44EPA IMP38HC44EPD IMP38HC44ESA IMP38HC44ESD IMP38HC44EMA IMP38HC44/D IMP38HC45EPA IMP38HC45EPD IMP38HC45ESA IMP38HC45ESD IMP38HC45EMA IMP38HC45/D
Package
8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE 8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE 8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE 8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE 8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE 8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE 8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE 8-Plastic DIP 14-Plastic DIP 8-SO 14-SO 8-MicroSO DIE
Operating Temperature Range
- 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C - 40C to 85C
Startup Voltage
14.5V 14.5V 14.5V 14.5V 14.5V 8.4V 8.4V 8.4V 8.4V 8.4V 14.5V 14.5V 14.5V 14.5V 14.5V 8.4V 8.4V 8.4V 8.4V 8.4V 14.5V 14.5V 14.5V 14.5V 14.5V 8.4V 8.4V 8.4V 8.4V 8.4V 14.5V 14.5V 14.5V 14.5V 14.5V 8.4V 8.4V 8.4V 8.4V 8.4V
Minimum Operating Voltage
9.0V 9.0V 9.0V 9.0V 9.0V 7.6V 7.6V 7.6V 7.6V 7.6V 9.0V 9.0V 9.0V 9.0V 9.0V 7.6V 7.6V 7.6V 7.6V 7.6V 9.0V 9.0V 9.0V 9.0V 9.0V 7.6V 7.6V 7.6V 7.6V 7.6V 9.0V 9.0V 9.0V 9.0V 9.0V 7.6V 7.6V 7.6V 7.6V 7.6V
Maximum Duty Cycle
96% 96% 96% 96% 96% 96% 96% 96% 96% 96% 50% 50% 50% 50% 50% 50% 50% 50% 50% 50% 96% 96% 96% 96% 96% 96% 96% 96% 96% 96% 50% 50% 50% 50% 50% 50% 50% 50% 50% 50%
Reference Voltage
2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V 2.5V
Peak Output Current Drive
0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 0.5A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A 1.0A
38C/HC_t02.eps
For SO and MicroSO packages, append "/T" to the ordering part number for tape and reel packaging.
(c) 2000 IMP, Inc.
PWM Controllers
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IMP38C/HC/42/3/4/5
Absolute Maximum Ratings
VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . 20V VCC Supply Current . . . . . . . . . . . . . . . . . . . . . . 30mA IOUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A Current-Sense and Feedback Inputs . . . . . . . . 0.3V to 5.5V Operation Junction Temperature . . . . . . . . . . . +150C Storage Temperature . . . . . . . . . . . . . . . . . . . . . - 65C to +150C Lead Soldering Temperature (10 seconds) . . . +300C Package Thermal Resistance 8-Pin Plastic DIP (JA) . . . . . . . . . . . . . . . . . 125C/W 8-Pin MicroSO (JA) . . . . . . . . . . . . . . . . . . . 250C/W 8-Pin SO (JA) . . . . . . . . . . . . . . . . . . . . . . . . 170C/W 14-Pin Plastic DIP (JA) . . . . . . . . . . . . . . . . 90C/W 14-Pin SO (JA) . . . . . . . . . . . . . . . . . . . . . . . 145C/W Note: All voltages are referenced to GND. These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability.
Electrical Characteristics
Unless otherwise noted, VCC = 15V, RT = 10k and CT = 3.3nF. Specifications are over the - 40C to +85C ambient temperature range. Bold/blue specifications indicate enhanced performance features.
Parameter
Reference Output voltage Line Regulation Load Regulation Temperature Stability Total Reference Variation Output Noise Voltage Long Term Stability Output Short Circuit Oscillator Section Initial Accuracy Voltage Stability Temperature Stability Discharge Current Amplitude peak-to-peak Error Amplifier Section Input Voltage Input Bias Current Open Loop Gain Unity Gain Bandwidth Power Supply Rejection Ratio Output Sink Current Output Source Current VOUT High VOUT Low
Symbol
VREF
Conditions
TA = +25C, IO = 1mA 12V VCC 18V, IOUT = 5A 1mA IO 20mA
Min
4.90
Typ
5.00 2 1 0.2
Max
5.10 20 25 5.18
Units
V mV mV mV/C V V mV mA kHz % %/C mA V V A dB MHz dB mA mA
TCREF VN ISC fINIT TCOSC VOSC, P-P VIN IB AVOL UGBW PSRR IOL IOH VOH VOL
Note 1 Line, Load, Temperature, Note 1 10Hz f 10kHz, TA = +25C, Note 1 TA = 125C, 1000 Hours, Note 1 - 30 TA = 25C, Note 5 12V VCC 18V Note 1 VRT/CT = 2V VRT/CT peak-to-peak VCOMP = 2.5V VFB = 4.5V 2V VO 4V, Note 1 Note1 VSTART VCC VCCMAX VFB = 2.7V, Vcomp = 1.1V VFB = 2.3V, Vcomp = 5.0V VFB = 2.3V, RL = 15k to ground VFB = 2.7V, RL = 15k to VREF 7.2 1.1 2.45 -1 65 0.7 60 2 - 0.5 4.5 49 4.82
50 TBD - 40 52 0.2 0.04 8.4 1.7 2.50 90 1.0 6 - 1.0 4.6 0.30 5.0 0.50 12.0 2.3 2.55 1 - 180 55 1.0
V V
4
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IMP38C/HC/42/3/4/5
Electrical Characteristics
Unless otherwise noted, VCC = 15V, RT = 10k and CT = 3.3nF. Specifications are over the - 40C to +85C ambient temperature range. Bold/blue specifications indicate enhanced performance features.
Parameter
Current Sense Gain Over Current Protection Threshold Power Supply Rejection Ratio Input Bias Current Delay to Output Output IMP38C4x ON Resistance, High ON Resistance, Low IMP38HC4x ON Resistance, High ON Resistance, Low Peak Drive Current IMP38C4x Rise Time IMP38C4x Fall Time IMP38HC4x Rise Time IMP38HC4x Fall Time Shoot-through Current Undervoltage Lockout Start Threshold Minimum Operating Voltage Pulse Width Modulator Maximum Duty Cycle Maximum Duty Cycle Minimum Duty Cycle Supply Current Start-Up Current Operating Current
Symbol
AVOL PSRR IB TPD
Conditions
Notes 1, 2 and 3 Vcomp = max, Note 2 VSTART VCC 18V VFB = 0V, ISNS 0V to 2V, CL = 1nF
Min
2.90 0.9
Typ
3.00 0.98 70 - 0.1 50
Max
3.10 1.1 - 2.0 65
Units
V/V V dB A ns
RDS (ON)
ISOURCE = 0.2A ISINK = 0.2A ISOURCE = 0.2A ISINK = 0.2A HC devices H devices TA = 25C, CL = 1nF TA = 25C, CL = 1nF TA = 25C, CL = 1nF TA = 25C, CL = 1nF
20 11 10 5.5 1.0 0.5 40 30 20 15 0 13.5 7.8 8 7.0 94 48 14.5 8.4 9 7.6 96 50 0 70 50 50 40
RDS (ON)
A ns ns ns ns mA V V
TR TF TR TF
IMP38C42/4, IMP38HC42/4 IMP38C43/5, IMP38HC43/5 IMP38C42/4, IMP38HC42/4 IMP38C43/5, IMP38HC43/5 IMP38C42/3, IMP38HC42/3, IMP38C44/5, IMP38HC44/5
15.5 9.0 10 8.2
% % % A mA
ICC
VCC = 13V for IMP38C42/44, IMP38HC42/44 VCC = 7.5V for IMP38C43/45, IMP38HC43/45 VFB = VIS = 0
95 0.5
120 1.5
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 , 0 VCS 0.8V VCS
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
UVLO Thresholds Start-up at 8.4V Start-up at 14.5V Operating Minimum = 7.6V Operating Minimum = 9.0V
IMP38C43/HC43 IMP38C45/HC45 IMP38C42/HC42 IMP38C44/HC44
38C/HC_t03.eps
Duty Cycle
0% to 96% 0% to 50%
(c) 2000 IMP, Inc.
PWM Controllers
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IMP38C/HC/42/3/4/5
Application Information
The IMP38C and IMP38HC devices are compatible with generic 384x PWM devices. The following discussion highlights the differences and advantages of the IMP `C' and `HC' designs.
Transient Protection
Good high-frequency layout practices should be followed. Avoid long printed-circuit traces and component leads. Locate oscillator and compensation components near the IC. Avoid capacitive and inductive coupling of the switching waveform into the high-impedance inputs of the error amplifier, oscillator, and current-sense amplifier. VREF and VCC stability will be aided by using high-frequency decoupling capacitors.
Start-up Current
IMP's BiCMOS process allows for substantial reduction in the start-up current. Typical start-up current is 95A, with a maximum limit of 120A. Low start-up current allows high resistance, lower-wattage, start-up resistors to supply controller start-up power.
Undervoltage Lockout
Several different thresholds are available.
Operating Current
Operating current has been reduced to 1.5mA maximum. Compared to the 11mA needed for a typical bipolar controller and 6mA for competitive BiCMOS controllers, IMP's low operating current allows the controller to run cooler and with better efficiency. In addition, the VCC hold-up capacitance (used during start-up) can be reduced.
Undervoltage Lockout Thresholds Start-up at 8.4V Operating Minimum = 7.6V
IMP38C43/HC43 IMP38C45/HC45
Start-up at 14.5V Operating Minimum = 9.0V
IMP38C42/HC42 IMP38C44/HC44
38C/HC_t04.eps
Output Driver
The IMP38HC4x/38C4x CMOS output stage drives external power MOSFETs to the full supply voltage. Low ON-resistance and high peak current drive combine to give greater than 1000pF gate capacitance drive capability. Rise and fall time requirements may dictate the appropriate value of output capacitance. Within the restrictions of output capacity and controller power dissipation, switching frequencies can exceed 1MHz. The CMOS output stage "break-before-make" action is guaranteed by design and insures that no cross-conduction current will flow. This minimizes heat dissipation, increases efficiency and enhances reliability.
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 and sets the output to zero. The output will sink up to 20mA in this controlled state and remain below 1.3V, well below the turn-on threshold voltage of the external MOSFET. With the IMP38C/HC4x output stage design, leakage current from the external power MOSFETs will not force the PWM output to rise and turn the external MOSFET on. Even when VDD drops to zero volts, the OUT pin will not rise above approximately 1.3V because the UVLO circuit is powered through the OUT pin. The IMP output stage performance in UVL mode, while sinking 20mA, is shown in Figure 2.
VOUT While Sinking 20mA
2.0 IMP38C/HC4x
Oscillator Operation
Two external components, RT and CT, set the switching frequency. With VCC = 14V, RT = 10k and CT = 3.3nF, nominal switching frequency is 50kHz.
VREF RT
1.5
Output (V)
IMP38C4x IMP38HC4x
frequency [ Hz ] = 1.73 RT [] x CT [ F ] RT/CT
1.0
CT GND
0.5
38C/HC_07.eps
0
0
1
2
3
4
5
6
7
8
9
Figure 1. Oscillator Component Selection
VDD (V)
38C/HC_05b.eps
Figure 2. Output Stage Performance in UVL Mode
6
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IMP38C/HC/42/3/4/5
Application Information
(11)
VD
+
UVLO
- + -
6 (10) OUT
T 2R
Q
-
1V R COMP
S R
Q UVL Protection
+
(8) PGND
3 (5) GND 5 AGND (9) ISNS
Connection Notes IMP38C4X, IMP38HC4X (8-Pin Devices) 50% Maximum Duty Cycle: IMP38C44, IMP38HC44, IMP38C45, IMP38HC45 96% Maximum Duty Cycle: IMP38C42, IMP38HC42, IMP38C43, IMP38HC43 ( ) Pins Are 14-Pin Devices Only
38C/HC_06.eps
Figure 3. UVL Protection Circuit
(c) 2000 IMP, Inc.
PWM Controllers
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IMP38C/HC/42/3/4/5
Package Dimensions
SO (8-Pin)
a
Inches Min
A A1 A2 b C D e E E1 L a A A1 B C e E H L D
Millimeters Max Min Max MicroSO (8-Pin)*
E1 E
L D A2 A e b A1
0.10mm 0.004in
C
----- 0.0433 0.0020 0.0059 0.0295 0.0374 0.0098 0.0157 0.0051 0.0091 0.1142 0.1220 0.0256 BSC 0.193 BSC 0.1142 0.1220 0.0157 0.0276 0 6
---- 1.10 0.050 0.15 0.75 0.95 0.25 0.40 0.13 0.23 2.90 3.10 0.65 BSC 4.90 BSC 2.90 3.10 0.40 0.70 0 6 1.35 0.10 0.33 0.19 1.27 3.80 5.80 0.40 4.80 ---- 0.38 2.92 0.36 1.14 0.80 9.02 0.13 7.62 6.10 2.54 7.62 ----- 2.92 10.92 3.81
38C/HC_t05.at3
D
+
MicroSO (8-Pin).eps
SO (8-Pin)**
0.053 0.004 0.013 0.007 0.050 0.150 0.228 0.016 0.189 0.157 0.244 0.050 0.197 0.069 0.010 0.020 0.010 1.75 0.25 0.51 0.25 4.00 6.20 1.27 2.00 5.33 ----- 4.95 0.56 1.78 1.14 10.16 ----- 8.26 7.11
SO (8-Pin)
0- 8
L
E
H
Plastic DIP (8-Pin)***
C D A
e B A1
SO (8-Pin).eps
Plastic DIP (8-Pin)
D1
E D A A2 E1
A ----- 0.210 A1 0.015 ----- A2 0.115 0.195 b 0.014 0.022 b2 0.045 0.070 b3 0.030 0.045 D 0.355 0.400 D1 0.005 ----- E 0.300 0.325 E1 0.240 0.280 e 0.100 ----- eA 0.300 ----- eB ----- 0.430 eC ----- 0.060 L 0.115 0.150 * JEDEC Drawing MO-187AA ** JEDEC Drawing MS-112AA *** JEDEC Drawing MS-001BA
L A1 e b b2
0-15 C eA eB
Plastic DIP (8-Pin)a.eps
8
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IMP38C/HC/42/3/4/5
Package Dimensions
SO (14-Pin)
Inches Min
A A1 B C D E
0- 8 A C e B A1 L
SO (16-Pin).eps
Millimeters Max SO (14-Pin)*
0.1043 0.118 0.020 0.0125 0.3622 0.2992 0.419 0.050
Min
2.35 0.10 0.33 0.23 8.80 7.40 1.27 BSC 10.00 0.40 3.94 0.51 0.356 1.27 0.204 18.93 7.62 6.10 2.54 TYP 7.62 TYP 3.18
Max
2.65 0.30 0.51 0.32 9.20 7.60 10.65 1.27 5.08 1.27 0.508 1.65 0.304 19.55 8.25 6.60
E
H
D
0.0926 0.0040 0.013 0.0091 0.3465 0.214 0.394 0.016
e H L
0.050 BSC
Plastic DIP (14-Pin)**
A 0.155 0.200 A1 0.20 0.50 B 0.014 0.020 B1 0.050 0.065 C 0.008 0.012 D 0.745 0.770 E 0.300 0.325 E1 0.240 0.260 e1 0.100 TYP eA 0.300 TYP L 0.100 ----- * JEDEC Drawing MS-013 AF ** JEDEC Drawing MO-001 AA-AB
Plastic DIP (14-Pin)
D1
E1
E
D
3.81
38C/HC_t06.at3
A
A1 e1 B1 B
L
0-15 C eA
Plastic DIP (14-Pin).eps
(c) 2000 IMP, Inc.
PWM Controllers
9
IMP38C/HC/42/3/4/5
IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Fax: 408-434-0335 e-mail: info@impinc.com http://www.impweb.com
The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners.
(c) 2000 IMP, Inc. Printed in USA Publication #: 3001 Revision: D Issue Date: 08/30/00 Type: Preliminary

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