NTE1765
Integrated Circuit
Dual Channel Current Mode Controller
Description:
The NTE1765 is a high performance, fixed frequency, dual current mode controller in a 16鈥揕ead DIP
type package. This device is specifically designed for Off鈥揕ine and DC to DC converter applications
offering the designer a cost effective solution with minimal external components. The NTE1765 fea-
tures a unique oscillator for precise duty cycle limit and frequency control, a temperature compen-
sated reference, two high gain error amplifiers, two current sensing comparators, drive output 2 en-
able 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鈥揵y鈥揷ycle 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鈥揃y鈥揅ycle 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鈥揢p and Operating Current
Absolute Maximum Ratings:
Total Power Supply Current, I
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Zener Current, I
Z
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Output Current, Source or Sink (Note 1), I
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Output Energy (Capacitive Load per Cycle), W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0碌J
Current Sense, Enable and Voltage Feedback Inputs, V
in
. . . . . . . . . . . . . . . . . . . . . . . 鈥?.3 to +5.5V
Sync Input, High State (Voltage), V
IH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Sync Input, Low State (Reverse Current), I
IL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.0mA
Error Amp Output Sink Current, I
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Maximum Power Dissipation (T
A
= +25擄C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25mW
Thermal Resistance, Junction鈥搕o鈥揂mbient, R
thJA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100擄C/W
Operating Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150擄C
Operating Ambient Temperature Range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0擄 to +70擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Note 1. Maximum package power dissipation limits must be observed.
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