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PDF ( 数据手册 , 数据表 ) MC33065-H

零件编号 MC33065-H
描述 High Performance Dual Channel Current Mode Controllers
制造商 Motorola Semiconductors
LOGO Motorola Semiconductors LOGO 


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MC33065-H 数据手册, 描述, 功能
www.DataSheet4U.com
Order this document by MC34065–H/D
MC34065-H, L
High Performance
MC33065-H, L
Dual Channel Current
Mode Controllers
The MC34065–H,L series are high performance, fixed frequency, dual
current mode controllers. They are specifically designed for off–line and
dc–to–dc converter applications offering the designer a cost effective
solution with minimal external components. These integrated circuits feature
a unique oscillator for precise duty cycle limit and frequency control, a
temperature compensated reference, two high gain error amplifiers, two
current sensing comparators, Drive Output 2 Enable pin, and two high
current totem pole outputs ideally suited for driving power MOSFETs.
Also included are protective features consisting of input and reference
undervoltage lockouts each with hysteresis, cycle–by–cycle current limiting,
and a latch for single pulse metering of each output. These devices are
available in dual–in–line and surface mount packages.
The MC34065–H has UVLO thresholds of 14 V (on) and 10 V (off), ideally
suited for off–line converters. The MC34065–L is tailored for lower voltage
applications having UVLO thresholds of 8.4 V (on) and 7.8 V (off).
Unique Oscillator for Precise Duty Cycle Limit and Frequency Control
Current Mode Operation to 500 kHz
Automatic Feed Forward Compensation
Separate Latching PWMs for Cycle–By–Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
Drive Output 2 Enable Pin
Two High Current Totem Pole Outputs
Input Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Vref
15
1
Sync Input
3
RT
CT
2
Voltage
Feedback 1
4
Compensation 1
5
Drive Output
2
Enable
14
Voltage
Feedback 2 13
Compensation 2
12
Representative Block Diagram
VCC 16
5.0V VCC
Reference
Undervoltage
R Lockout
R
Vref
Undervoltage
Lockout
Oscillator
+
Error
Amp 1
Latching
PWM 1
Drive Output 1
7
Current Sense 1
6
+
Error
Amp 2
Gnd 8
Latching
PWM 2
Drive Gnd 9
Drive Output 2
10
Current Sense 2
11
HIGH PERFORMANCE
DUAL CHANNEL CURRENT
MODE CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
PIN CONNECTIONS
Sync Input 1
CT 2
RT 3
Voltage Feedback 1 4
Compensation 1 5
Current Sense 1 6
Drive Output 1 7
Gnd 8
16 VCC
15 Vref
14 Drive Output 2 Enable
13 Voltage Feedback 2
12 Compensation 2
11 Current Sense 2
10 Drive Output 2
9 Drive Gnd
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC34065DW–H
MC34065DW–L
MC34065P–H
TA = 0° to +70°C
SO–16L
Plastic DIP
MC34065P–L
MC33065DW–H
MC33065DW–L
MC33065P–H
MC33065P–L
TA = –40° to +85°C
SO–16L
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 0
1







MC33065-H pdf, 数据表
www.DataSheet4U.com
Sync Input
Capacitor CT
Latch 1
“Set” Input
Compensation 1
Current Sense 1
Latch 1
“Reset” Input
Drive Output 1
Drive Output
2
Enable
Latch 2
“Set” Input
Compensation 2
Current Sense 2
Latch 2
“Reset” Input
Drive Output 2
MC34065–H, L MC33065–H, L
Figure 16. Timing Diagram
The outputs do not contain internal current limiting,
therefore an external series resistor may be required to
prevent the peak output current from exceeding the ±400 mA
maximum rating. The sink saturation (VOL) is less than 0.75 V
at 50 mA.
A separate Drive Ground pin is provided and, with proper
implementation, will significantly reduce the level of switching
transient noise imposed on the control circuitry. This
becomes particularly useful when reducing the Ipk(max) clamp
level. Figure 23 shows the proper ground connections
required for current sensing power MOSFET applications.
Drive Output 2 Enable Pin
This input is used to enable Drive Output 2. Drive Output 1
can be used to control circuitry that must run continuously
such as volatile memory and the system clock, or a remote
controlled receiver, while Drive Output 2 controls the high
power circuitry that is occasionally turned off.
Reference
The 5.0 V bandgap reference is trimmed to ±2.0%
tolerance at TJ = 25°C. The reference has short circuit
protection and is capable of providing in excess of 30 mA for
powering any additional control system circuitry.
Design Considerations
Do not attempt to construct the converter on
wire–wrap or plug–in prototype boards. High frequency
circuit layout techniques are imperative to prevent
pulse–width jitter. This is usually caused by excessive noise
pick–up imposed on the Current Sense or Voltage Feedback
inputs. Noise immunity can be improved by lowering circuit
impedances at these points. The printed circuit layout should
contain a ground plane with low current signal and high
current switch and output grounds returning on separate
paths back to the input filter capacitor. Ceramic bypass
capacitors (0.1 µF) connected directly to VCC and Vref may be
required depending upon circuit layout. This provides a low
impedance path for filtering the high frequency noise. All high
current loops should be kept as short as possible using
heavy copper runs to minimize radiated EMI. The Error Amp
compensation circuitry and the converter output
voltage–divider should be located close to the IC and as far
as possible from the power switch and other noise generating
components.
8 MOTOROLA ANALOG IC DEVICE DATA







MC33065-H equivalent, schematic
www.DataSheet4U.com
MC34065–H, L MC33065–H, L
How to reach us:
USA / EUROPE / Locations Not Listed: Motorola Literature Distribution;
P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454
MFAX: [email protected] – TOUCHTONE 602–244–6609
INTERNET: http://Design–NET.com
JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,
3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315
ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
16
MOTOROLA ANALOG ICMDCE3V4I0C6E5–DH/ADTA
*MC34065-H/D*










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