MAX5069
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
4 _______________________________________________________________________________________
Note 1: The MAX5069 is 100% tested at T
A
= +25°C. All limits over temperature are guaranteed by design.
Note 2: The MAX5069A/B are intended for use in universal-input power supplies. The internal clamp circuit is used to prevent the
bootstrap capacitor (C1 in Figure 1) from charging to a voltage beyond the absolute maximum rating of the device when
UVLO/EN is low. The maximum current to V
IN
(hence to clamp) when UVLO is low (device is in shutdown) must be external-
ly limited to 2mA. Clamp currents higher than 2mA may result in clamp voltages higher than 30V, thus exceeding the
absolute maximum rating for V
IN
. For the MAX5069C/D, do not exceed the 24V maximum operating voltage of the device.
Note 3: Reference voltage (V
REF
) is measured with FB connected to COMP (see the Functional Diagram).
Note 4: The SYNC frequency must be at least 25% higher than the programmed oscillator frequency.
Note 5: The internal oscillator clock cycle.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V for the MAX5069C/D, V
IN
= +23.6V for the MAX5069A/B at startup, then reduces to +12V, C
IN
= C
REG5
= 0.1µF,
C
VCC
= 1µF, R
RT
= 100kΩ, NDRV_ = floating, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
