HSMC H3842S High performance current mode controler Datasheet

HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 1/10
MICROELECTRONICS CORP.
H3842S
HIGH PERFORMANCE CURRENT MODE CONTROLERS
Description
The H3842S is high performance fixed frequency current mode controllers. That is specifically designed for OffLine and DC To DC converter applications offering the designer a costeffective solution with minimal external
components. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature
compensated reference, high gain error amplifier, current sensing compara-tor, and a high current totem pole
output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output
deadtime, and a latch for single pulse metering.
Features
• Trimmed Oscillator for Precise Frequency Control
• Oscillator Frequency Guaranteed at 250 kHz
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle-By-Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
Absolute Maximum Ratings
Symbol
Vi
Vi
Io
Eo
Ptot
Tstg
TJ
TL
Parameter
Supply Voltage (low impedance source)
Supply Voltage (Ii<30mA)
Output Current
Output Energy (capacitive load)
Analog Inputs (pin 2, 3)
Error Amplifier Output Sink Current
Power Dissipation at Tamb≤25oC
Storage Temperature Range
Junction Operating Temperature
Lead Temperature (soldering 10s)
Value
30
Self Limiting
±1
5
-0.3 to 5.5
10
800
-65 to 150
-40 to 150
300
Unit
V
A
uJ
V
mA
mW
o
C
o
C
o
C
Block Diagram
Vcc
7
UVLO
34V
Ground
S/R
5
VFB
COMP
Current
Sense
H3842S
4
Error AMP.
+
-
2
1
3
VREF
5V 50mA
Internal
Bias
2.50V
RT/CT
8
5V
REF
VREF Good
Logic
6
T
OSC
2R
R
S
R
1V
Output
PWM Latch
Current
Sense
Comparator
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 2/10
MICROELECTRONICS CORP.
Pin Connection (Top View)
SOP-8P
Function
Pin1: Compensation
Pin2: Voltage Feedback
8
7
6
5
Pin3: Current Sense
Pin4: RT/CT
1
2
3
4
Pin5: Ground
Pin6: Output
Pin7: Vcc
Pin8: Vref
Description
This pin is the Error Amplifier output and is made available for
loop compensation.
This is the inverting input of the Error Amplifier. It’s normally
connected to the switching power supply output through a
resistor divider.
A voltage proportional to inductor current is connected to this
input. The PWM uses this information to terminate the output
switch conduction.
The oscillator frequency and maximum output duty cycle are
programmed by connecting resistor RT to Vref and cpacitor CT
to ground. Operation to 500kHz is possible.
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak
currents up to 1A are sourced and sunk by this pin.
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for
capacitor CT through resistor RT.
Thermal Data
Symbol
Rth j-amb
Description
Thermal Resistance Junction-ambient
Max.
100
Units
C/W
o
Electrical Specifications
Parameter
Test Conditions
Min.
Typ.
Max.
Units
14.5
8.5
16
10
17.5
11.5
V
V
Under-Voltage Lockout Section
Start Threshold
Min. Operating Voltage
After Turn On
Electrical Characteristics
Unless otherwise stated, specifications apply for 0≤Ta≤70°C Vcc =15V (Note 1); RT=680Ω, CT=0.022uF for
triangular mode, RT=10k, CT=3.3nf for sawtooth mode
Parameter
Test Conditions
Min.
Typ.
Max.
Units
Line , Load , Temp (Note 2)
10Hz≤f≤10kHz,Tj=25°C (Note 2)
Ta=125°C,1000Hrs (Note 2)
Ta=25°C
4.90
4.82
-30
5
2.0
3.0
0.2
50
5
-100
5.1
20
25
5.18
-180
V
mV
mV
mV/°C
V
uV
mV
mA
Tj=25°C
Tlow≤Ta≤Thigh
12V≤Vcc≤25V
Tlow≤Ta≤Thigh (Note 2)
Tj=25°C
Peak to Peak
Tj=25°C
Tlow≤Ta≤Thigh
47
46
7.8
7.2
52
52
0.2
5
0.5
1.7
8.3
-
57
60
1
9.3
9.5
KHz
KHz
%
%
%
V
mA
mA
Reference Section
Reference Output Voltage
Line Regulation
Load Regulation
Temperature. Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short current
Tj=25°C,Io=1mA
12V≤Vin≤25V
1mA≤Io≤20mA
(Note 2)
Oscillator Section
Frequency
Frequency Chnge with Temperature
Frequency Change with Temperature
Oscillator Voltage Swing
Discharge Current
H3842S
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 3/10
MICROELECTRONICS CORP.
Parameter
Test Conditions
Min.
Typ.
Max.
Units
Tj=25°C
Tlow≤Ta≤Thigh
12V≤Vcc≤25V
Tlow≤Ta≤Thigh (Note 2)
Tj=25°C
Peak to Peak
Tj=25°C
Tlow≤Ta≤Thigh
47
46
7.8
7.2
52
52
0.2
5
0.5
1.7
8.3
-
57
60
1
9.3
9.5
KHz
KHz
%
%
%
V
mA
mA
Vo=2.5V
VFB=5.0V
2≤Vo≤4 V
Tj=25°C (Note 2)
12V≤Vcc≤25V
Sink (Vo=1.1V, VFB=2.7V)
Source (Vo=5.0V, VFB=2.3V)
2.42
65
0.7
60
2.0
-0.5
2.50
-0.1
90
1.0
70
12
-1.0
2.58
-2.0
-
V
uA
dB
MHz
dB
mA
mA
VFB=2.3V, RL=15K to ground
5
6
-
V
VFB=2.7V, RL=15K to Vref
-
0.7
1.1
V
2.85
3.0
3.15
V/V
0.9
1.0
1.1
V
-
70
-2.0
150
-10
300
dB
uA
nS
13
12
-
0.1
1.5
13.5
13.4
50
50
-0.1
0.4
2.2
150
150
-1.1
V
V
V
V
nS
nS
V
-
0.1
11
34
0.5
17
-
mA
mA
V
Oscillator Section
Frequency
Frequency Chnge with Temperature
Frequency Change with Temperature
Oscillator Voltage Swing
Discharge Current
Error Amplifier Section
Voltage Feedback Input
Input Bias Current
Open Loop Voltage Gain
Unity Gain Bandwidth
Power Supply Rejection Ratio
Output Current
Output Voltage Swing
High State
Low State
Current Sense Section
Current Sense Input Voltage Gain
Maximum Current Sense Input
Thresold
Ppwer Supply Rejection Ratio
Input Bias Current
Propagation Delay
(Notes 3 & 4)
(Note 3)
12V≤Vcc≤25V (Note 3)
Tj=25°C (Note 2)
Output Section
Output Voltage
Output Voltage Rise Time
Output Voltage Fall Time
Output Voltage with UVLO Activated
Low State (Isink=20mA)
Low State (Isink=200mA)
High State (Isource=20mA)
High State (Isource=200mA)
Tj=25°C, CL=1.0nF (Note 2)
Tj=25°C, CL=1.0nF (Note 2)
Vcc=6V , Isink=1.0mA
Total Device
Start-Up Current
Operating Supply Current
Vcc Zener Voltage
Vpin2=Vpin3=0, RT=10K, CT=3.3nF
Icc=25 mA
Note 1: Adjust Vcc above the start threshold before setting at 15V.
Note 2: These parameters, although guaranteed are not 100% tested in production.
Note 3: Parameter measured at trip point of latch with Vpin2=0.
Note 4: Gain defined as: A=Vpin1/Vpin3, 0≤Vpin3≤0.8V
H3842S
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 4/10
MICROELECTRONICS CORP.
Characteristics Curve
Oscillator Frequency & Timing Resistance
Maximum Duty Cycle & Timing Resistance
100
10000K
80
1000K
CT=1.0nF
60
CT=4.7nF
fo(Hz)
fo(Hz)
CT=2.2nF
100K
40
10K
20
1K
100
1000
10000
0
100
100000
1000
RT(Ω)
10000
100000
RT(Ω)
Oscillator Discharge Current & Temperate
Error Amp Open-Loop Gain and Phase &
Frequency
9
Φ
100
Vi=15V
Vosc=2V
80
Gain
30
60
8
(dB)
Idischg (mA)
8.5
Vcc=15V
Vo=2V to 4V
RL=100K
o
Ta=25 C
60
40
90
Phase
20
120
0
150
7.5
7
180
-20
-50
-25
0
25
50
75
100
125
10
o
100
1000
TA ( C)
10000
100000
1000000 10000000
f (Hz)
Current Sense Input Threshold & Error Amp
Output Voltage
Reference Voltage Change & Source Current
60
1.2
Vcc=15V
50
1
Vcc=15V
40
Vth (V)
0.8
30
o
0.6
Ta=25 C
o
0.4
20
o
Ta=125 C
Ta=-40 C
o
Ta=125 C
o
o
Ta=25 C
Ta=-40 C
10
0.2
0
0
0
2
4
Vo (V)
H3842S
6
8
0
20
40
60
80
100
120
Iref (mA)
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 5/10
MICROELECTRONICS CORP.
Reference Short Circuit Current &Temperature
Supply Current & Supply Voltage
110
25
100
Vcc=15V
RL≤ 0.1Ω
RT=10K
CT=3.3nF
20
15
Ii (mA)
Isc (mA)
90
80
10
70
5
60
50
0
-50
-25
0
25
o
50
75
100
125
0
10
20
TA ( C)
30
40
Vi (V)
Output Saturation Voltage & Load Current
Output Saturation Voltage & Load Current
0
4
Source Saturation
(Load to Ground)
Sink Saturation
(Load to Vcc)
-1
3
o
Vsat (V)
Vsat (V)
Ta=25 C
-2
o
Ta=-40 C
o
Ta=-40 C
2
o
Ta=25 C
-3
1
Vcc=15V
80us Pulsed Load
120Hz Rate
-4
Vcc=15V
80us Pulsed Load
120Hz Rate
0
0
H3842S
200
400
Io (mA)
600
800
0
200
400
Io (mA)
600
800
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 6/10
MICROELECTRONICS CORP.
Application Information
Open Loop Test Circuit
Vref
4.7KΩ
RT
100KΩ
COMP
1KΩ
2
I SENSE
I SENSE
Adjust
5KΩ
8
1
V FB
Error Amp.
Adjust
A
V REF
HPN2222A
3
RT/CT
Vcc
7
H3842
Output
6
1W
1KΩ
0.1uF
Output
Ground
5
4
Vcc
0.1uF
4.7KΩ
Ground
CT
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and
bypass capacitors should be connected close to pin5 in a single point ground. The transistor and 5KΩ
potentiometerare used to samplethe oscillator waveform and apply an adjustable ramp to pin3.
Oscillator and Output Waveforms
Vcc
7
8
5V REG
PWM
CT
1
3
2
6
Output
Clock
RT
4
Output
Oscillator
Large RT / Small CT
Id
CT
CT
5
GND
Output
Small RT / Large CT
Error Amp Configuration
Under Voltage Lockout
2.5V
+
V FB
Zi
Vi
7
ON/OFF Command
To Rest Of IC
COMP 1
Icc
<17mA
2
-
Zf
1mA
Von
Voff
H3842
16V
10V
<0.5mA
Voff
H3842S
Von
Vcc
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 7/10
MICROELECTRONICS CORP.
Current Sense Circuit
Error Ampl.
2R
Current
Sense
Comparator
COMP 1
Is
R
Rs
R
3
C
1V
Current
Sense
5
GND
Peak current (Is) is determined by the formula
Is(max.) ≈ 1V/Rs
A small RC filter may be required to suppress switch transients.
Slope Compensation Techniques
V REG
V REG
8
RT
RT/CT
Is
RT
I SENSE
R1
Rs
RT/CT
4
CT
R SLOPE
8
Is
H3842
3
CT
R SLOPE
H3842
I SENSE
5
R1
Rs
GND
4
3
5
GND
Isolated MOSFET Drive and Current Transformer Sensing
Vin
Vcc
7
Isolation
Boundary
+
5.0Vref
-
Q1
VGS Waveforms
6
+
-
+
0
-
S
R
+
Q
50%DC
25%DC
Ipk=((Vpin1-1.4)/3Rs)(Ns/Np)
COMP/Latch
R
3
C
H3842S
+
0
-
Rs
Ns
Np
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 8/10
MICROELECTRONICS CORP.
Latched Shutdown
4
OSC
8
R
BIAS
+
R
1mA
+
-
2
1
2R
EA
R
5
2N3905
2N3903
SCR must be selected for a holding current of less than
0.5mA at TA(min). The simple two transistor circuit can be
used in place of the SCR as shown. All resistors are 10K.
Error Amplifier Compensation
From Vo
Ri
Rd
Cf
Rf
From Vo
2R
-
EA
5
+
Cf
Rf
1mA
+
2
Rd
Error Amp compensation circuit for
stabilizing any current-mode topology
except for boost and flyback converters
operating with continuous inductor
current
R
1
2.5V
Rp
Cp
1mA
+
2
Ri
+
2.5V
2R
-
Error Amp compensation circuit for
stabilizing current-mode boost and
flyback topologies operating with
continuous inductor current.
R
EA
1
5
External Clock Synchronization
Vref 8
R
RT
R
4
OSC
+
CT
External
Sync Input
+
0.01uF
2
47Ω
H3842S
BIAS
1
-
2R
EA
R
5
The diode clamp is
required if the Sync
amplitude is large enough
to cause the bottom side
of CT to go more than
300mV below ground
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 9/10
MICROELECTRONICS CORP.
External Duty Cycle Clamp and Multi Unit Synchronization
Vref
8
RA
RB
R
4
8
BIAS
5KΩ
6
R
+
5
3
R
5KΩ
2
OSC
7
Q
+
4
+
S
-
+
2
-
5KΩ
C
1
NE555
2R
EA
1
R
5
To Additional
H3842
f=1.44/((RA+2RB)C), Dmax=RB/(RA+2RB)
Soft-Start Circuit
5Vref
8
+
R
-
BIAS
R
4
OSC
+
+
2
1MΩ
-
S
1mA
Q
+
2R
EA
R
1
-
1V
R
5
C
Soft-Start and Error Amplifier Output Duty Cycle Clamp
Vcc
Vin
7
5Vref
R
R
4
1mA
+
R2
1
-
EA
+
-
BIAS
7
OSC
+
2
+
8
6
Q1
S
Vclamp
Q
2R
R
1V
+
R
5
Comp/Latch
5
C
R1
Rs
BC109
Vclamp=R1/(R1+R2) where 0<Vclamp<1V, Ipk(max)=Vclamp/RS
H3842S
HSMC Product Specification
HI-SINCERITY
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 10/10
MICROELECTRONICS CORP.
SO-8 Dimension
Top View
Right side View
G
A
Marking:
8
7
6
5
H3 8 4 2S
I
C
B
Date Code
1
H
2
3
4
8-Lead SO-8 Plastic Package
HSMC Package Code: S
J
E
D
Front View
Part A
Part A
F
Inches
DIM
Min.
0.1909
0.1515
0.2283
0.0480
0.0145
0.1472
0.0570
0.1889
A
B
C
D
E
F
G
H
K
Max.
0.2007
0.1555
0.2441
0.0519
0.0185
0.1527
0.0649
0.2007
M
L
N
O
Millimeters
Min.
Max.
4.85
5.10
3.85
3.95
5.80
6.20
1.22
1.32
0.37
0.47
3.74
3.88
1.45
1.65
4.80
5.10
DIM
I
J
K
L
M
N
O
*: Typical
Millimeters
Min.
Max.
0.05
0.20
0.30
0.70
0.19
0.25
0.37
0.52
0.30
0.50
0.08
0.13
0.00
0.15
Inches
Min.
0.0019
0.0118
0.0074
0.0145
0.0118
0.0031
0.0000
Max.
0.0078
0.0275
0.0098
0.0204
0.0197
0.0051
0.0059
Notes: 1.Dimension and tolerance based on our Spec. dated Aug. 01,1999.
2.Controlling dimension: millimeters.
3.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
4.If there is any question with packing specification or packing method, please contact your local HSMC sales office.
Material:
• Lead: 42 Alloy; solder plating
• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
Important Notice:
• All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of HSMC.
• HSMC reserves the right to make changes to its products without notice.
• HSMC semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
• HSMC assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
Head Office And Factory:
• Head Office (Hi-Sincerity Microelectronics Corp.): 10F.,No. 61, Sec. 2, Chung-Shan N. Rd. Taipei Taiwan R.O.C.
Tel: 886-2-25212056 Fax: 886-2-25632712, 25368454
• Factory 1: No. 38, Kuang Fu S. Rd., Fu-Kou Hsin-Chu Industrial Park Hsin-Chu Taiwan. R.O.C
Tel: 886-3-5983621~5 Fax: 886-3-5982931
H3842S
HSMC Product Specification
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