MIC38HC44-1BN [MICREL]
BiCMOS 1A Current-Mode PWM Controllers; BiCMOS工艺1A电流模式PWM控制器
| 型号： | MIC38HC44-1BN |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | BiCMOS 1A Current-Mode PWM Controllers |
| 文件： | 总8页 (文件大小：76K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC38HC42/3/4/5
BiCMOS 1A Current-Mode PWM Controllers
General Description
Features
The MIC38HC4x family are fixed frequency current-mode
PWM controllers with 1A drive current capability. Micrel’s
BiCMOS devices are pin-compatible with 384x bipolar de-
vices. Their high output drive, with fast rise and fall times,
combined with low startup current make it an ideal PWM
controller where high efficiency is required.
• Fast 20ns output rise and 15ns output fall times
• –40°C to +85°C temperature range
exceeds UC284x specifications
• High-performance, low-power BiCMOS Process
• Ultralow start-up current (50µA typical)
• Low operating current (4mA typical)
• High output drive (1A peak current, HC version)
• CMOS outputs with rail-to-rail swing
• Current-mode operation up to 500kHz
• Trimmed 5V bandgap reference
Undervoltagelockoutcircuitryallowsthe’42and’44versions
to start up at 14.5V and operate down to 9V, and the ’43 and
’45 versions start at 8.4V with operation down to 7.6V. All
versions operate up to 20V.
• Pin-for-pin compatible with UC3842/3843/3844/3845(A)
• Trimmed oscillator discharge current
• UVLO with hysteresis
When compared to bipolar UC384x devices operating from a
15V supply, start-up current has been reduced to 50µA
typical and operating current has been reduced to 4.0 mA
typical. Decreased output rise and fall times drive larger
MOSFETs, and rail-to-rail output capability increases effi-
ciency, especiallyatlowersupplyvoltages. TheMIC38HC4x
also features a trimmed oscillator discharge current and
bandgap reference.
• Low cross-conduction currents
Applications
• Current-mode, off-line, switched-mode power supplies
• Current-mode, dc-to-dc converters.
• Step-down “buck” regulators
• Step-up “boost” regulators
• Flyback, isolated regulators
• Forward converters
MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC
packages. 8-pin devices feature small size, while 14-pin
devices separate the analog and power connections for
improved performance and power dissipation.
• Synchronous FET converters
Functional Diagram
*
VDD
7 (12)
35V
5V
Reference
UVLO
VREF
(VD)
8 (14)
(11)
†
‡
Oscillator
RT/CT
OUT
4 (7)
6 (10)
T
Q
Q
FB
2R
R
2 (3)
(PGND)
(8)
S
R
2.5V
*
COMP GND*(AGND) ISNS
1 (1)
5
(9)
3 (5)
( ) pins are on MIC38HC4x-1 (14-lead) versions only
* MIC38HC4x (8-lead) versions only
†
MIC38HC42, MIC38HC43 (96% max. duty cycle) versions only
MIC38HC44, MIC38HC45 (50% max. duty cycle) versions only
‡
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 2000
1
MIC38HC42/3/4/5
MIC38HC42/3/4/5
Micrel
Ordering Information
Part Number
Temperature Range
Package
8-pin Plastic DIP
8-pin Plastic DIP
8-pin Plastic DIP
8-pin Plastic DIP
14-pin Plastic DIP
14-pin Plastic DIP
14-pin Plastic DIP
14-pin Plastic DIP
8-pin SOIC
MIC38HC42BN
MIC38HC43BN
MIC38HC44BN
MIC38HC45BN
MIC38HC42-1BN
MIC38HC43-1BN
MIC38HC44-1BN
MIC38HC45-1BN
MIC38HC42BM
MIC38HC43BM
MIC38HC44BM
MIC38HC45BM
MIC38HC42-1BM
MIC38HC43-1BM
MIC38HC44-1BM
MIC38HC45-1BM
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
8-pin SOIC
8-pin SOIC
8-pin SOIC
14-pin SOIC
14-pin SOIC
14-pin SOIC
14-pin SOIC
Selection Guide
UVLO Thresholds
Startup 8.4V Startup 14.5V
Minimum Operating 7.6V Minimum Operating 9V
Duty Cycle
0% to 96%
0% to 50%
MIC38HC43
MIC38HC45
MIC38HC42
MIC38HC44
MIC38HC42/3/4/5
2
August 2000
MIC38HC42/3/4/5
Micrel
Pin Configuration
MIC38HC4x-1
COMP
NC
1
2
3
4
5
6
7
14 VREF
13 NC
FB
12 VDD
11 VD
MIC38HC4x
NC
COMP
FB
1
2
3
4
8
7
6
5
VREF
VDD
OUT
GND
ISNS
NC
10 OUT
9
8
AGND
PGND
ISNS
RT/CT
RT/CT
8-Pin DIP (N)
8-Lead SOIC (M)
14-Pin DIP (-1BN)
14-Lead SOIC (-1BM)
Pin Description
Pin Number
N, M, MM
Pin Number
-1BN, -1BM
Pin Name
COMP
Pin Function
1
2
3
1
Compensation: Connect external compensation network to modify the error
amplifier output.
2
3
NC
FB
Not internally connected.
Feedback (Input): Error amplifier input. Feedback is 2.5V at desired output
voltage.
4
5
NC
Not internally connected.
ISNS
Current Sense (Input): Current sense comparator input. Connect to current
sensing resistor or current transformer.
6
7
NC
Not internally connected.
4
5
RT/CT
Timing Resistor/Timing Capacitor: Connect external RC network to select
switching frequency.
GND
PGND
AGND
OUT
Ground: Combined analog and power ground.
Power Ground: N-channel driver transistor ground.
Analog Ground: Controller circuitry ground.
Power Output: Totem-pole output.
8
9
6
7
8
10
11
VD
Power Supply (Input): P-channel driver transistor supply input. Return to
power ground (PGND).
12
VDD
Analog Supply (Input): Controller circuitry supply input. Return to analog
ground (AGND).
13
14
NC
Not internally connected.
VREF
5V Reference (Output): Connect external RC network.
August 2000
3
MIC38HC42/3/4/5
MIC38HC42/3/4/5
Micrel
Absolute Maximum Ratings
Zener Current (V ) ...................................................30mA
Operating Junction Temperature (T ) ....................... 150°C
DD
J
Operation at ≥18V may require
Package Thermal Resistance
special precautions (Note 6).
8-Pin Plastic DIP (θ ).......................................125°C/W
JA
8-Pin MM8™ (θ ).............................................250°C/W
Supply Voltage (V ), Note 6 .......................................20V
JA
DD
8-Pin SOIC (θ ) ...............................................170°C/W
JA
Switch Supply Voltage (V ) ..........................................20V
D
14-Pin Plastic DIP (θ ).......................................90°C/W
JA
Current Sense Voltage (V
) ..................... –0.3V to 5.5V
ISNS
14-Pin SOIC (θ ) .............................................145°C/W
JA
Feedback Voltage (V )................................ –0.3V to 5.5V
FB
Storage Temperature (T ) ....................... –65°C to +150°C
A
Output Current, 38HC42/3/4/5 (I
)..............................1A
OUT
Electrical Characteristics
VDD = 15V, Note 4; RT = 9.09kΩ; CT = 3.3nF; –40°C ≤ TA ≤ 85°C; unless noted
Parameter
Test Conditions
Min
Typ
Max
Units
Reference Section
Output Voltage
TA = 25°C, IO = 1mA
4.90
5.00
2
5.10
20
V
mV
mV
mV/°C
V
Line Regulation
Load Regulation
Temp. Stability
12V ≤ VDD ≤ 18V, IO = 5µA, Note 6
1 ≤ IO ≤ 20mA
1
25
Note 1
0.2
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
Oscillator Section
Initial Accuracy
Line, Load, Temp., Note 1
10Hz ≤ f ≤ 10kHz, TA = 25°C, Note 1
TA = 125°C, 1000 hrs., Note 1
4.82
5.18
50
5
µV
25
mV
mA
–30
–80
–180
TA = 25°C, Note 5
49
52
0.2
55
kHz
%
Voltage Stability
Temp. Stability
12 ≤ VDD ≤ 18V, Note 6
TMIN ≤ TA ≤ TMAX, Note 1
1.0
0.04
%/°C
Clock Ramp
TA = 25°C, VRT/CT = 2V
TA = TMIN to TMAX
7.7
7.2
8.4
8.4
9.0
9.5
mA
mA
Reset Current
Amplitude
VRT/CT peak to peak
1.9
Vp-p
Error Amp Section
Input Voltage
Input Bias Current
AVOL
VCOMP = 2.5V
2.42
2.50
–0.1
90
2.58
V
µA
dB
MHz
dB
mA
mA
V
VFB = 5.0V
–2
2 ≤ VO ≤ 4V
65
0.7
60
2
Unity Gain Bandwidth
PSRR
Note 1
1.0
12 ≤ VDD ≤ 18V
Output Sink Current
Output Source Current
VOUT High
VFB = 2.7V, VCOMP = 1.1V
VFB = 2.3V, VCOMP = 5V
VFB = 2.3V, RL = 15k to ground
VFB = 2.7V, RL = 15k to VREF
14
–1
–0.5
5
6.8
0.1
VOUT Low
1.1
V
MIC38HC42/3/4/5
4
August 2000
MIC38HC42/3/4/5
Micrel
Parameter
Test Conditions
Min
Typ
Max
Units
Current Sense
Gain
Notes 2, 3
2.85
0.9
3.0
1
3.15
1.1
V/V
V
MaximumThreshold
PSRR
VCOMP = 5V, Note 2
12 ≤ VDD ≤ 18V, Note 2
70
dB
µA
ns
Input Bias Current
Delay to Output
Output
–0.1
120
–2
250
RDS(ON) ‘HC’ High
RDS(ON) ‘HC’ Low
ISOURCE = 200mA
ISINK = 200mA
10
Ω
Ω
5.5
Rise Time
TA = 25°C, CL = 1nF
TA = 25°C, CL = 1nF
20
15
50
40
ns
ns
Fall Time
Undervoltage Lockout
Start Threshold
MIC38HC42/4
MIC38HC43/5
MIC38HC42/4
MIC38HC43/5
13.5
7.8
8
14.5
8.4
9
15.5
9.0
10
V
V
V
V
Minimum Operating Voltage
7.0
7.6
8.2
Pulse Width Modulator
Maximum Duty Cycle
MIC38HC42/3
MIC38HC44/5
94
46
96
50
%
%
%
Minimum Duty Cycle
Total Standby Current
Start-Up Current
0
VDD = 13V, 38HC42/44
VDD = 7.5V, 38HC43/45
50
200
6.0
µA
Operating Supply Current
VFB = VISNS = 0V
4.0
37
mA
V
Zener Voltage (VDD
)
IDD = 25mA, Note 6
30
Note 1: These parameters, although guaranteed, are not 100% tested in production.
Note 2: Parameter measured at trip point of latch with VEA = 0.
Note 3: Gain defined as:
∆ VPIN1
VTH (ISNS
A =
; 0 ≤ VTH (ISNS) ≤ 0.8V
)
Note 4: Adjust VDD above the start threshold before setting at 15V.
Note 5: Output frequency equals oscillator frequency for the MIC38HC42 and MIC38HC43. Output frequency for the MIC38HC44, and
MIC38HC45 equals one half the oscillator frequency.
Note 6: On 8-pin version, 20V is maximum input on pin 7, as this is also the supply pin for the output stage. On 14-pin version, 40V is
maximum for pin 12 and 20V maximum for pin 11.
August 2000
5
MIC38HC42/3/4/5
MIC38HC42/3/4/5
Micrel
Typical Characteristics
Oscillator Frequency
MIC38C/HC42/43 Output Dead
Time vs. Oscillator Frequency
Oscillator Discharge
Configuration
Current vs. Temperature
100
9.0
8.8
8.6
8.4
8.2
8.0
7.8
7.6
7.4
7.2
7.0
100
200pF
VDD = 15V
470pF
1nF
1.8nF
4.7nF
10nF
10
10
200pF
470pF
1nF
18nF
4.7nF
10nF
VDD = 15V
V
OSC = 2V
VDD = 15V
1
1
4
5
6
4
5
6
-60 -30
0
30 60 90 120 150
1x10
1x10
FREQUENCY (Hz)
1x10
1x10
1x10
1x10
TEMPERATURE (°C)
OSCILLATOR FREQUENCY (Hz)
Current Sense Amplifier
vs. Error Amplifier Output
Short-Circuit Reference
MIC38C4x
Current vs. Temperature
Output Waveform
1.2
1.0
0.8
0.6
0.4
0.2
0.0
120
100
80
60
40
20
0
25
20
15
10
5
125°C
25°C
0
-5
-50°C
VD = 15V
L = 1nF
VDD = 15V
-10
C
-15
0
2
4
6
8
-60 -30
0
30 60 90 120 150
0.0
0.2
0.4
0.6
0.8
1.0
ERROR AMPLIFIER OUTPUT (V)
TEMPERATURE (°C)
TIME (µs)
MIC38HC42/3/4/5
6
August 2000
MIC38HC42/3/4/5
Micrel
Package Information
PIN 1
DIMENSIONS:
INCH (MM)
0.380 (9.65)
0.370 (9.40)
0.255 (6.48)
0.245 (6.22)
0.135 (3.43)
0.125 (3.18)
0.300 (7.62)
0.013 (0.330)
0.010 (0.254)
0.380 (9.65)
0.320 (8.13)
0.018 (0.57)
0.100 (2.54)
0.130 (3.30)
0.0375 (0.952)
8-Pin Plastic DIP (N)
.770 (19.558) MAX
PIN 1
.235 (5.969)
.215 (5.461)
.060 (1.524)
.045 (1.143)
.310 (7.874)
.280 (7.112)
.160 MAX
(4.064)
.080 (1.524)
.015 (0.381)
.015 (0.381)
.008 (0.2032)
.160 (4.064)
.100 (2.540)
.110 (2.794)
.090 (2.296)
.023 (.5842)
.015 (.3810)
.400 (10.180)
.330 (8.362)
.060 (1.524)
.045 (1.143)
14-Pin Plastic DIP (N)
August 2000
7
MIC38HC42/3/4/5
MIC38HC42/3/4/5
Micrel
0.026 (0.65)
MAX)
PIN 1
0.157 (3.99)
0.150 (3.81)
DIMENSIONS:
INCHES (MM)
0.020 (0.51)
0.013 (0.33)
0.050 (1.27)
TYP
45°
0.0098 (0.249)
0.0040 (0.102)
0.010 (0.25)
0.007 (0.18)
0°–8°
0.197 (5.0)
0.189 (4.8)
0.050 (1.27)
0.016 (0.40)
SEATING
PLANE
0.064 (1.63)
0.045 (1.14)
0.244 (6.20)
0.228 (5.79)
8-Pin SOIC (M)
PIN 1
DIMENSIONS:
INCHES (MM)
0.154 (3.90)
0.026 (0.65)
MAX)
0.193 (4.90)
45°
0.050 (1.27) 0.016 (0.40)
TYP TYP
0.006 (0.15)
3°–6°
0.244 (6.20)
0.228 (5.80)
0.344 (8.75)
0.337 (8.55)
SEATING
PLANE
0.057 (1.45)
0.049 (1.25)
14-Pin SOIC (M)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
MIC38HC42/3/4/5
8
August 2000
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