Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 2/10
HI-SINCERITY
MICROELECTRONICS CORP.
Pin Connection (Top View)
DIP-8P
Function
Description
This pin is the Error Amplifier output and is made available for
loop compensation.
Pin1: Compensation
This is the inverting input of the Error Amplifier. It’s normally
connected to the switching power supply output through a
resistor divider.
Pin2: Voltage Feedback
Pin3: Current Sense
Pin4: RT/CT
A voltage proportional to inductor current is connected to this
input. The PWM uses this information to terminate the output
switch conduction.
8
1
7
2
6
3
5
4
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.
Pin5: Ground
Pin6: Output
Pin7: Vcc
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
Pin8: Vref
capacitor CT through resistor RT.
Thermal Data
Symbol
Description
Thermal Resistance Junction-ambient
Max.
100
Units
oC/W
Rth j-amb
Electrical Specifications
Parameter
Test Conditions
Min.
Typ.
Max.
Units
Under-Voltage Lockout Section
Start Threshold
14.5
8.5
16
10
17.5
11.5
V
V
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
Reference Section
Test Conditions
Min.
Typ.
Max.
Units
Reference Output Voltage
Line Regulation
4.90
5
2.0
3.0
0.2
-
5.1
20
25
-
V
mV
mV
mV/°C
V
Tj=25°C,Io=1mA
-
12V≤Vin≤25V
Load Regulation
-
1mA≤Io≤20mA
(Note 2)
Temperature. Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short current
-
4.82
-
Line , Load , Temp (Note 2)
10Hz≤f≤10kHz,Tj=25°C (Note 2)
Ta=125°C,1000Hrs (Note 2)
Ta=25°C
5.18
-
50
5
uV
-
-
mV
mA
-30
-100
-180
Oscillator Section
47
46
-
52
52
0.2
5
0.5
1.7
8.3
-
57
60
1
KHz
KHz
%
Tj=25°C
Frequency
Tlow≤Ta≤Thigh
12V≤Vcc≤25V
Tlow≤Ta≤Thigh (Note 2)
Tj=25°C
Frequency Chnge with Temperature
Frequency Change with Temperature
Oscillator Voltage Swing
Discharge Current
-
-
%
-
-
-
-
%
V
mA
mA
Peak to Peak
Tj=25°C
Tlow≤Ta≤Thigh
7.8
7.2
9.3
9.5
H3842P
HSMC Product Specification
HSMC [ HI-SINCERITY MOCROELECTRONICS ]
