NCV8772
Vin
Thermal
Shutdown
Driver
With
Current
Erorr Amplifier
Limit
EN
Enable
Reset Comparator
Vout
*
RO
Reset Driver
Reference
GND
Oscillator
* 5 V OPTION ONLY
** D2PAK−7 ONLY
*** Pull−Down Resistor (typ 150 kW) active only in Reset State
Figure 2. Simplified Block Diagram
PIN CONNECTIONS
Timing
Circuit
DT**
***
PIN 1. Vin
2. RO
Tab, 3. GND
4. EN
5. Vout
1
DPAK−5
PIN 1. Vin
2. RO
Tab, 3. GND
4. EN
5. Vout
1
D2PAK−5
Figure 3. Pin Connections
1
D2PAK−7
PIN 1. Vin
2. RO
3. NC
Tab, 4. GND
5. EN
6. DT
7. Vout
PIN FUNCTION DESCRIPTION
Pin No.
DPAK−5
D2PAK−5
Pin No.
D2PAK−7
Pin Name
1
1
Vin
2
2
RO
−
3, TAB
4
−
5
3
4, TAB
5
6
7
NC
GND
EN
DT
Vout
Description
Positive Power Supply Input. Connect 0.1 mF capacitor to ground.
Reset Output. 30 kW internal Pull−up resistor connected to Vout. RO goes Low when Vout
drops by more than 7% (typ) from its nominal value (for NCV8772y devices with y = 1,2,3,...)
or more than 10% (typ) from its nominal value (for NCV8772y devices with y = A, B, C,...).
Not Connected
Power Supply Ground.
Enable Input. Low level disables the IC.
Reset Delay Time Select. Short to GND or connected to Vout to select time.
Regulated Output Voltage. Connect 1 mF capacitor with ESR < 100 W to ground.
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