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| ER3110DI Datasheet, PDF (13/23 Pages) Altera Corporation – Synchronous Buck Regulator | |||
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Page 13
Measurements
FSW = 500kHz, VPVIN = 24V, VOUT = 3.3V, TA = +25°C (Continued)
SW 20V/DIV
VOUT 5V/DIV
IL 500mA/DIV
POK 2V/DIV
200µs/DIV
FIGURE 41. NEGATIVE CURRENT LIMIT RECOVERY, PWM
Functional Block Diagram
VOUT 2V/DIV
POK 2V/DIV
500µs/DIV
FIGURE 42. OVER-TEMPERATURE PROTECTION, PWM
FB
FSW
SYNC
FB
OSCILLATOR
PFM
5M CURRENT
SET
gm
Internal = 50µA/V
External = 230µA/V
EN/SOFT
START
POWER
GOOD
LOGIC
5M
BIAS
LDO
600mV VREF
FAULT
LOGIC
500mV/A
Current Sense
PWM/PFM
SELECT LOGIC FB
sQ
RQ
PWM
GATE
DRIVE
AND
PWM DEADTIME
450mV/T Slope
Compensation
(PWM only)
150k
Internal
54pF Compensation
Zero Current
Detection
PACKAGE
PADDLE
AVINO
BOOT
SW
PGND
Detailed Description
The ER3110DI combines a synchronous buck PWM controller with integrated power switches. The buck controller
drives internal high-side and low-side N-channel MOSFETs to deliver load current up to 1A. The buck regulator can
operate from an unregulated DC source, such as a battery, with a voltage ranging from +3V to +36V. An internal LDO
provides bias to the low voltage portions of the IC.
Peak current mode control is utilized to simplify feedback loop compensation and reject input voltage variation. User
selectable internal feedback loop compensation further simplifies design. The ER3110DI switches at a default 500kHz.
May 2014 Altera Corporation
10038
Enpirion Power Datasheet ER3110DI Wide PVIN 1A Synchronous Buck Regulator
May 28, 2014
Rev A
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