ZHCSQX4F August 1995 – August 2022 UC1823A , UC1825A , UC2823A , UC2823B , UC2825A , UC2825B , UC3823A , UC3823B , UC3825A , UC3825B
PRODUCTION DATA
| TERMINAL | I/O | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | NO. | |||
| J, N, or DW | Q or L | |||
| CLK/LEB | 4 | 5 | O | Output of the internal oscillator |
| CT | 6 | 8 | I | Timing capacitor connection pin for oscillator frequency programming. The timing capacitor should be connected to the device ground using minimal trace length. |
| EAOUT | 3 | 4 | O | Output of the error amplifier for compensation |
| GND | 10 | 13 | Analog ground return pin | |
| ILIM | 9 | 12 | I | Input to the current limit comparator |
| INV | 1 | 2 | I | Inverting input to the error amplifier |
| NI | 2 | 3 | I | Non-inverting input to the error amplifier |
| OUTA | 11 | 14 | O | High current totem pole output A of the on-chip drive stage. |
| OUTB | 14 | 18 | O | High current totem pole output B of the on-chip drive stage. |
| PGND | 12 | 15 | Ground return pin for the output driver stage | |
| RAMP | 7 | 9 | I | Non-inverting input to the PWM comparator with 1.25-V internal input offset. In voltage mode operation, this serves as the input voltage feed-forward function by using the CT ramp. In peak current mode operation, this serves as the slope compensation input. |
| RT | 5 | 7 | I | Timing resistor connection pin for oscillator frequency programming |
| SS | 8 | 10 | I | Soft-start input pin which also doubles as the maximum duty cycle clamp. |
| VC | 13 | 17 | Power supply pin for the output stage. This pin should be bypassed with a 0.1-μF monolithic ceramic low ESL capacitor with minimal trace lengths. | |
| VCC | 15 | 19 | Power supply pin for the device. This pin should be bypassed with a 0.1-μF monolithic ceramic low ESL capacitor with minimal trace lengths | |
| VREF | 16 | 20 | O | 5.1-V reference. For stability, the reference should be bypassed with a 0.1-μF monolithic ceramic low ESL capacitor and minimal trace length to the ground plane. |