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參數(shù)資料
| 型號： | HSMC3842 |
| 廠商： | HSMC CORP. |
| 英文描述： | HIGH PERFORMANCE CURRENT MODE CONTROLERS |
| 中文描述： | 高性能電流模式CONTROLERS |
| 文件頁數(shù)： | 2/10頁 |
| 文件大小： | 154K |
| 代理商： | HSMC3842 |
HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 2/10
H3842P
HSMC Product Specification
Pin Connection
(Top View)
DIP-8P
Function
Description
Pin1: Compensation
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.
Pin2: Voltage Feedback
Pin3: Current Sense
Pin4: RT/CT
Pin5: Ground
Pin6: Output
Pin7: Vcc
1
2
3
4
5
6
7
8
Pin8: Vref
Thermal Data
Symbol
Rth j-amb
Description
Max.
100
Units
o
C/W
Thermal Resistance Junction-ambient
Electrical Specifications
Parameter
Test Conditions
Min.
Typ.
Max.
Units
Under-Voltage Lockout Section
Start Threshold
Min. Operating Voltage
Electrical Characteristics
Unless otherwise stated, specifications apply for 0
≤
Ta
≤
70
°
C Vcc =15V
(Note 1)
; RT=680
, CT=0.022uF for
triangular mode, RT=10k, CT=3.3nf for sawtooth mode
Parameter
Test Conditions
Reference Section
Reference Output Voltage
Tj=25
°
C,Io=1mA
Line Regulation
12V
≤
Vin
≤
25V
Load Regulation
1mA
≤
Io
≤
20mA
Temperature. Stability
(Note 2)
Total Output Variation
Line , Load , Temp
(Note 2)
Output Noise Voltage
10Hz
≤
f
≤
10kHz,Tj=25
°
C
(Note 2)
Long Term Stability
Ta=125
°
C,1000Hrs
(Note 2)
Output Short current
Ta=25
°
C
Oscillator Section
Tj=25
°
C
Frequency
Tlow
≤
Ta
≤
Thigh
Frequency Chnge with Temperature
12V
≤
Vcc
≤
25V
Tlow
≤
Ta
≤
Thigh
(Note 2)
Frequency Change with Temperature
Tj=25
°
C
Oscillator Voltage Swing
Peak to Peak
Tj=25
°
C
Discharge Current
Tlow
≤
Ta
≤
Thigh
14.5
8.5
16
10
17.5
11.5
V
V
After Turn On
Min.
Typ.
Max.
Units
4.90
-
-
-
4.82
-
-
-30
5
5.1
20
25
-
5.18
-
-
-180
V
2.0
3.0
0.2
-
50
5
-100
mV
mV
mV/
°
C
V
uV
mV
mA
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
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