NTE NTE1765 Integrated circuit dual channel current mode controller Datasheet

NTE1765
Integrated Circuit
Dual Channel Current Mode Controller
Description:
The NTE1765 is a high performance, fixed frequency, dual current mode controller in a 16–Lead DIP
type package. This device is specifically designed for Off–Line and DC to DC converter applications
offering the designer a cost effective solution with minimal external components. The NTE1765 features a unique oscillator for precise duty cycle limit and frequency control, a temperature compensated reference, two high gain error amplifiers, two current sensing comparators, drive output 2 enable pin, and two high current totem pole outputs ideally suited for driving power MOSFETS.
Also included are protective features consisting of input and reference undervoltage lockouts each
with hysteresis, cycle–by–cycle current limiting, and a latch for single pulse metering of each output.
Features:
D Unique Oscillator for Precise Duty Cycle Limit and Frequency Control
D Current Mode Operation to 500kHz
D Automatic Feed Forward Compensation
D Separate Latching PWMs for Cycle–By–Cycle Current Limiting
D Internally Trimmed Reference with Undervoltage Lockout
D Drive Output 2 Enable Pin
D Two High Current Totem Pole Outputs
D Input Undervoltage Lockout with Hysteresis
D Low Start–Up and Operating Current
Absolute Maximum Ratings:
Total Power Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Zener Current, IZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Output Current, Source or Sink (Note 1), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Output Energy (Capacitive Load per Cycle), W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0µJ
Current Sense, Enable and Voltage Feedback Inputs, Vin . . . . . . . . . . . . . . . . . . . . . . . –0.3 to +5.5V
Sync Input, High State (Voltage), VIH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Sync Input, Low State (Reverse Current), IIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –5.0mA
Error Amp Output Sink Current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Maximum Power Dissipation (TA = +25°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25mW
Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100°C/W
Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Note 1. Maximum package power dissipation limits must be observed.
Electrical Characteristics: (VCC = 15V (Note 2), RT = 8.2kΩ, CT = 3.3nF, Note 3 unless otherwise
specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
4.9
5.0
5.1
V
Reference Section
Reference Output Voltage
Vref
IO = 1mA, TJ = +25°C
Line Regulation
Regline
VCC = 11V to 15V
–
2.0
20
mV
Load Regulation
Regload
IO = 1mA to 10mA
–
3.0
25
mV
Total Output Variation over Line,
Load and Temperature
Vref
4.85
–
5.15
V
Output Short Circuit Current
ISC
30
100
–
mA
46.5
49.0
51.5
kHz
–
0.2
1.0
%
DCmax
46.0
49.5
52.0
%
DCmin
–
–
0
%
Oscillator and PWM Sections
Total Frequency Variation over Line
and Temperature
Frequency Change with Voltage
Duty Cycle at each Output
Maximum
Minimum
fOSC
∆fOSC/∆V
VCC = 11V to 15V, TA = 0° to +70°C
VCC = 11V to 15V
Sync Input Current
High State
IIH
Vin = 2.4V
–
170
250
µA
Low State
IIL
Vin = 0.8V
–
80
160
µA
VFB
VO = 2.5V
2.42
2.50
2.58
V
IIB
VFB = 5V
–
–0.1
–1.0
µA
VO = 2V to 4V
65
100
–
dB
TJ = +25°C
0.7
1.0
–
MHz
60
90
–
dB
–0.45
2.0
–
–1.0
–
–
mA
mA
–
12
–
mA
5.0
6.2
–
V
–
0.8
1.1
V
Error Amplifiers
Voltage Feedback Input
Input Bias Current
Open–Loop Voltage Gain
Unity Gain Bandwidth
AVOL
BW
Power Supply Rejection Ratio
PSRR
VCC = 11V to 15V
Output Current
Source
ISource
VO = 3V, VFB = 2.3V
Sink
ISink
VO = 1.2V, VFB = 2.7V
VOH
RL = 15k to GND, VFB = 2.3V
VOL
RL = 15k to Vref, VFB = 2.7V
Current Sense Input Voltage Gain
AV
Note 4, Note 5
2.75
3.00
3.25
V/V
Max. Current Sense Input Threshold
Vth
Note 4
430
480
530
mV
Input Bias Current
IIB
–
–2
–10
µA
tPLN(IN/OUT)
–
150
300
ns
Output Voltage Swing
High State
Low State
Current Sense Section
Propagation Delay (Current Sense
Input to Output
Note 2. Adjust VCC above the Start–Up threshold before setting to 15V.
Note 3. For typical values, TA = +25C; for Min/Max values, TA = 0° to +70°C. Low duty cycle pulse
techniques are used during test to maintain junction temperature as close to ambient as possible.
Note 4. This parameter is measured at the latch trip point with Vfb = 0V.
∆V Compensation
Note 5. Comparator gain is defined as AV =
∆V Current Sense
Electrical Characteristics (Cont’d): (VCC = 15V (Note 2), RT = 8.2kΩ, CT = 3.3nF, Note 3 unless
otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Drive Output 2 Enable Pin
Enable Pin Voltage
High State
VIH
Output 2 Enabled
3.5
–
Vref
V
Low State
VIL
Output 2 Disabled
0
–
1.5
V
IIB
VIL = 0V
100
250
400
µA
ISink = 20mA
–
0.1
0.4
V
ISink = 200mA
–
1.6
2.5
V
ISource = 20mA
13.0
13.5
–
V
ISource = 200mA
12.0
13.4
–
V
VCC = 6V, ISink = 1mA
–
0.1
1.1
V
Low State Input Current
Drive Outputs
Output Voltage
Low State
VOL
High State
VOH
Output Voltage with UVLO Activated
VOL(UVLO)
Output Voltage Rise Time
tr
CL = 1nF
–
28
150
ns
Output Voltage Fall Time
tf
CL = 1nF
–
25
150
ns
Vth
13
14
15
V
VCC(min)
9.0
10.0
11.0
V
VCC = 12V
–
0.6
1.0
mA
Note 2
–
20
25
mA
15.5
17.0
19.0
V
Undervoltage Lockout Section
Start–Up Threshold
Min. Operating Voltage After Turn–On
Total Device
Power Supply Current
Start–Up
ICC
Operating
Power Supply Zener Voltage
VZ
ICC = 30mA
Note 2. Adjust VCC above the Start–Up threshold before setting to 15V.
Note 3. For typical values, TA = +25C; for Min/Max values, TA = 0° to +70°C. Low duty cycle pulse
techniques are used during test to maintain junction temperature as close to ambient as possible.
Pin Connection Diagram
Sync Input 1
16 VCC
CT 2
15 Vref
RT 3
14 Drive Output 2 Enable
Voltage Feedback 1 4
13 Voltage Feedback 2
Compensation 1 5
12 Compensation 2
Current Sense 1 6
11 Current Sense 2
Drive Output 1 7
GND 8
10 Drive Output 2
9
Drive GND
16
9
.260
(6.6)
Max
1
8
.300 (7.62)
.785 (19.9) Max
.200
5.08)
Max
.245
(6.22)
Min
.100 (2.54)
.700 (17.7)
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