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BD9P1X5EFV-C 데이터시트(PDF) 24 Page - Rohm |
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BD9P1X5EFV-C 데이터시트(HTML) 24 Page - Rohm |
24 / 60 page 24/57 TSZ02201-0J1J0AL01480-1-2 © 2019 ROHM Co., Ltd. All rights reserved. 08.Apr.2020 Rev.002 www.rohm.com TSZ22111 • 15 • 001 BD9P1x5EFV-C Series Function Explanation - continued 8. VCC_EX Function This IC has the function that supplies power from VOUT to internal supply VREG to improve the efficiency. When VVCC_EX goes above VTEXH (3.05 V, Typ) or more, VREG is supplied from the VCC_EX pin. In case of the VCC_EX pin connected with VOUT, the output voltage is used as a power supply for the internal circuitry and driver block. To protect the internal circuit, VOUT is reduced with PWM switching when VCC_EX voltage exceeds VEXOVPH (6.0 V, Typ). Therefore, the VCC_EX pin connection can be used when the output voltage is in the range of between VTEXH (3.2 V, Max) and VEXOVPL (5.65 V, Min). Connect the VCC_EX pin with GND when VCC_EX function is not required. The bias current IBIAS using VCC_EX function can be calculated using the following formula. �������������������� = ��������_������������1 + ��������_������������_��������1 × 1 ���� × ����������������_�������� ������������ [μA] Where: �������������������� is total current from VIN [µA] ��������_������������1 is quiescent current from VIN (without current from VCC_EX) [µA] (Refer to page 10) ��������_������������_��������1 is quiescent current from VCC_EX [µA] (Refer to page 10) ���� is efficiency of Buck Converter ����������������_�������� is the VCC_EX voltage [V] ������������ is the input voltage [V] VIN VREG + VREG (LDO) - VCC_EX VTEXH = 3.05 V (Typ) / VTEXL = 2.90 V (Typ) ON/OFF ON/OFF Figure 38. VCC_EX Block Diagram VIN VEN VOUT = VVCC_EX (Short) VSW VREG VTEXH 3.05 V (Typ) VCC_EX State VCC_EX OFF VCC_EX ON VCC_EX OFF VTEXL 2.90 V (Typ) Vout Setting Level Vout Setting Level VREG 3.3 V (Typ) Figure 39. VCC_EX Timing Chart |
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