HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 1/10
H3842P / HSMC3842
HIGH PERFORMANCE CURRENT MODE CONTROLERS
Description
The H3842P/HSMC3842 are high performance fixed frequency 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 trimmed oscillator for precise duty
DIP-8Pin
cycle control. A temperature compensa-ted reference, high gain error amplifier,
current sensing comparator, 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
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≤25
o
C
Storage Temperature Range
Junction Operating Temperature
Lead Temperature (soldering 10s)
Value
30
Self Limiting
±1
5
-0.3 to 5.5
10
1.25
-65 to 150
-40 to 150
300
Unit
V
A
uJ
V
mA
W
o
C
o
C
o
C
Ptot
Tstg
TJ
TL
Block Diagram
Vcc
7
34V
Ground
5
2.50V
VREF Good
Logic
T
2R
R
S
R
1V
Current
Sense
Comparator
UVLO
S/R
5V
REF
Internal
Bias
6
8
VREF
5V 50mA
RT/CT
4
Error AMP.
+
-
OSC
Output
VFB
COMP
Current
Sense
2
1
3
PWM Latch
H3842P
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
Pin Connection
(Top View)
DIP-8P
Function
Pin1: Compensation
Pin2: Voltage Feedback
Pin3: Current Sense
Pin4: RT/CT
1
2
3
4
Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 2/10
8
7
6
5
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
o
Units
C/W
Electrical Specifications
Parameter
Under-Voltage Lockout Section
Start Threshold
Min. Operating Voltage
After Turn On
14.5
8.5
16
10
17.5
11.5
V
V
Test Conditions
Min.
Typ.
Max.
Units
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
Reference Section
Reference Output Voltage
Line Regulation
Load Regulation
Temperature. Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short current
Oscillator Section
Frequency
Frequency Chnge with Temperature
Frequency Change with Temperature
Oscillator Voltage Swing
Discharge Current
H3842P
Test Conditions
Tj=25°C,Io=1mA
12V≤Vin≤25V
1mA≤Io≤20mA
(Note 2)
Min.
4.90
-
-
-
4.82
-
-
-30
47
46
-
-
-
-
7.8
7.2
Typ.
5
2.0
3.0
0.2
-
50
5
-100
52
52
0.2
5
0.5
1.7
8.3
-
Max.
5.1
20
25
-
5.18
-
-
-180
57
60
1
-
-
-
9.3
9.5
Units
V
mV
mV
mV/°C
V
uV
mV
mA
KHz
KHz
%
%
%
V
mA
mA
Line , Load , Temp
(Note 2)
10Hz≤f≤10kHz,Tj=25°C
(Note 2)
Ta=125°C,1000Hrs
(Note 2)
Ta=25°C
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
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
Parameter
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
Output Section
Output Voltage
Output Voltage Rise Time
Output Voltage Fall Time
Output Voltage with UVLO Activated
Total Device
Start-Up Current
Operating Supply Current
Vcc Zener Voltage
Vpin2=Vpin3=0, RT=10K, CT=3.3nF
Icc=25 mA
-
-
-
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
-
-
13
12
-
-
-
(Notes 3 & 4)
(Note 3)
Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 3/10
Test Conditions
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)
VFB=2.3V, RL=15K to ground
VFB=2.7V, RL=15K to Vref
Min.
2.42
-
65
0.7
60
2.0
-0.5
5
-
2.85
0.9
-
-
-
Typ.
2.50
-0.1
90
1.0
70
12
-1.0
6
0.7
3.0
1.0
70
-2.0
150
0.1
1.5
13.5
13.4
50
50
-0.1
0.1
11
34
Max.
2.58
-2.0
-
-
-
-
-
-
1.1
3.15
1.1
-
-10
300
0.4
2.2
-
-
150
150
-1.1
0.5
17
-
Units
V
uA
dB
MHz
dB
mA
mA
V
V
V/V
V
dB
uA
nS
V
V
V
V
nS
nS
V
mA
mA
V
12V≤Vcc≤25V
(Note 3)
Tj=25°C
(Note 2)
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
H3842P
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
Characteristics Curve
Oscillator Frequency & Timing Resistance
10000K
100
Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 4/10
Maximum Duty Cycle & Timing Resistance
80
1000K
CT=1.0nF
CT=2.2nF
60
fo(Hz)
100K
fo(Hz)
40
20
0
100
CT=4.7nF
10K
1K
100
1000
10000
100000
1000
10000
100000
RT(Ω)
RT(Ω)
Oscillator Discharge Current & Temperate
9
100
Vi=15V
Vosc=2V
80
Error Amp Open-Loop Gain and Phase &
Frequency
Φ
Vcc=15V
Vo=2V to 4V
R
L
=100K
o
Ta=25 C
30
60
Phase
90
120
150
180
10
100
1000
10000
100000
1000000 10000000
8.5
Gain
60
Idischg (mA)
(dB)
-50
-25
0
25
o
8
40
20
7.5
0
7
50
75
100
125
-20
TA ( C)
f (Hz)
Current Sense Input Threshold & Error Amp
Output Voltage
1.2
Vcc=15V
1
Reference Voltage Change & Source Current
60
50
Vcc=15V
40
0.8
Vth (V)
0.6
0.4
0.2
0
0
Ta=25 C
Ta=125 C
o
o
30
Ta=-40 C
o
20
Ta=125 C
10
o
Ta=25 C
o
Ta=-40 C
o
0
2
4
6
8
0
20
40
60
80
100
120
Vo (V)
Iref (mA)
H3842P
HSMC Product Specification
HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 5/10
Reference Short Circuit Current &Temperature
110
25
Supply Current & Supply Voltage
100
Vcc=15V
RL
≤
0.1Ω
20
R
T
=10K
C
T
=3.3nF
90
Isc (mA)
15
80
Ii (mA)
10
5
0
-50
-25
0
25
50
75
100
125
0
70
60
50
TA ( C)
o
10
20
30
40
Vi (V)
Output Saturation Voltage & Load Current
0
Source Saturation
(Load to Ground)
-1
Ta=25 C
o
Output Saturation Voltage & Load Current
4
Sink Saturation
(Load to Vcc)
3
Vsat (V)
Vsat (V)
Ta=-40 C
2
Ta=25 C
o
o
-2
Ta=-40 C
o
-3
Vcc=15V
80us Pulsed Load
120Hz Rate
1
Vcc=15V
80us Pulsed Load
120Hz Rate
-4
0
200
0
Io (mA)
400
600
800
0
200
Io (mA)
400
600
800
H3842P
HSMC Product Specification
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