HY3844 Datasheet PDF - Hooyi

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HY3844
Hooyi

Part Number HY3844
Description (HY3842 / HY3845) PWM controller
Page 9 Pages


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HY3842/43/44/45
DESCRIPTION
The HY3842D-N/3843D-N/3844D-N/3845D-N, are fixed frequency
current mode PWM controller. They are specially designed for OFFLine and DC to DC
converter applications with a minimal external components. Internally implemented circuits
include a trimmed oscillator for precise duty cycle control, a temperature compensated
reference, high gain error amplifier, current sensing comparator, and a high current totem pole
output ideally suited for driving a power MOSFET. Protection circuitry
includes built under voltage lockout and current limiting.
The HY3842D-N, HY3844D-N, have UVLO thresholds of 16 V (on) and 10 V (off).
The corresponding thresholds for the HY3843D-N/3845D- N are 8.4V (on) and 7.6V (off).
The HY3842D-N, HY3843D-N, can operate within 100% duty cycle. The HY3844D-N,
HY3845D-N, can operate within 50% duty cycle.
The HY384XD-N have Start-Up Current 0.17mA (typ).
PIN CONNECTION
(TOP VIEW)
FEATURES
Low Start-Up and Operating Current
High Current Totem Pole Output
Under voltage Lockout With Hysteresis
Operating Frequency Up To 500KHz
BLOCK DIAGRAM
(toggle flip flop used only in HY3844, HY3845)
Absolute Maximum Ratings
Characteristic
Supply Voltage (low impedance source)
Output Current
Input Voltage (Analog Inputs pins 2,3)
Error Amp Output Sink Current
Power Dissipation (TA=250C)
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
Symbol
VCC
IO
VI
ISINK (E.A)
PO
Tstg
TL
Value
30
±1
0.3 to 5.5
10
1
-65 to150
260
1
Unit
V
A
V
mA
W
oC
oC
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HY3842/43/44/45
Electrical characteristics (*VCC=15V, RT=10k, CT=3.3nF, TA=00C to +700C, unless otherwise specified)
Characteristics
Symbol
Test Condition
Min Typ Max
Reference Section
Reference Output Voltage
Line Regulation
Load Regulation
Short Circuit Output Current
VREF
VREF
VREF
ISC
TJ = 25°C, IREF = 1 mA
12V VCC 25 V
1 mA IREF 20mA
TA = 25°C
4.9 5.0 5.1
6.0 20
6.0 25
-100
-180
Oscillator Section
Oscillation Frequency
Frequency Change with Voltage
Oscillator Amplitude
f
f/VCC
V(OSC)
TJ = 25°C
12V VCC 25 V
(peak to peak)
47 52 57
0.05 1.0
1.6
Error Amplifier Section
Input Bias Current
IBIAS
VFB=3V
-0.1 -2
Input Voltage
Open Loop Voltage Gain
Unity Gain Bandwidth
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
VI(E.A)
AVOL
UGBW
PSRR
ISINK
ISOURCE
VOH
VOL
Vpin1 = 2.5V
2V V0 4V
Tj=250C, Note 3
12V VCC 25 V
Vpin2 = 2.7V, Vpin1 = 1.1V
Vpin2 = 2.3V, Vpin1 = 5V
Vpin2 = 2.3V, RL = 15Kto GND
Vpin2 = 2.7V, RL = 15Kto PIN 8
2.42 2.5 2.58
65 90
0.5 0.6
60 70
27
-0.5 -1.0
5.0 6.0
0.8 1.1
Current Sense Section
Gain
Maximum Input Signal
Supply Voltage Rejection
Input Bias Current
GV
VI(MAX)
SVR
IBIAS
(Note 1 & 2)
V pin1 = 5V (Note1)
12V VCC 25 V (Note 1)
Vpin3 = 3V
2.85 3.0 3.15
0.9 1.0 1.1
70
-3.0 -10
Output Section
Low Output Voltage
High Output Voltage
Rise Time
Fall Time
Undervoltage Lockout Section
VOL ISINK = 20 mA
ISINK = 200 mA
VOH
ISINK = 20 mA
ISINK = 200 mA
tR TJ = 25°C, CL = 1nF (Note 3)
tF TJ = 25°C, CL = 1nF (Note 3)
0.08 0.4
1.4 2.2
13 13.5
12 13.0
45 150
35 150
Start Theshold
VTH(ST)
HY3842D-N/44D-N
HY3843D-N/45D-N
14.5 16.0 17.5
7.8 8.4 9.0
Min. Operating Voltage
(After Turn On)
VOPR(min)
HY3842D-N/44D-N
HY3843D-N/45D-N
8.5 10 11.5
7.0 7.6 8.2
PWM Section
Max. Duty Cycle
D(MAX)
HY3842D-N/43D-N
HY3844D-N/45D-N
95 97 100
47 48 50
Min. Duty Cycle
D(MAX)
0
Total Standby Current
StartUp Current
HY3843D-N, HY3845D-N
IST
HY3842D-N, HY3844D-N
0.17
0.17
0.3
0.3
Operating Supply Current
ICC (OPR)
Vpin3 = Vpin2 = 0V
Zener Voltage
VZ ICC=25 mA
* Adjust VCC above the start threshold before setting it to 15V.
Note 1: Parameter measured at trip point of latch with Vpin2=0.
Note 2: Gain defined as A=Vpin1/Vpin3 ; 0 Vpin3 0.8V.
Note 3: These parameters, although guaranteed, are not 100% tested in production.
13 17
30 38
Unit
V
mV
mA
KHz
%
V
µA
V
dB
MHz
dB
mA
mA
V
V/V
V
dB
µA
V
nS
V
V
%
mA
V
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PIN FUNCTION
N FUNCTION
1 COMP
2 VFB
3 ISENSE
4 RT/CT
5 GROUND
6 OUTPUT
7 VCC
8 Vref
HY3842/43/44/45
DESCRIPTION
This pin is the Error Amplifier output and is made for loop compensation.
This is the inverting input of the Error Amplifier. It is 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 capacitor CT to ground.
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 sink
by this pin.
This pin is the positive supply of the integrated circuit.
This is the reference output. It provides charging current for capacitor CT through resistor RT .
APPLICATION INFORMATION
Figure 1. Error Amp Configuration
HY3842 HY3843
HY3844 HY3845
Figure 2. Under voltage Lockout
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HY3842/43/44/45
Figure 3. Current Sense Circuit
HY3842
HY3842
Figure 4. Slope Compensation Techniques
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